📂 LeetCode Solutions Repository

This repository contains my solutions to a variety of LeetCode problems, organized for clarity and ease of reference.

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LeetCode Topics

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0013-roman-to-integer
0073-set-matrix-zeroes
0076-minimum-window-substring
0128-longest-consecutive-sequence
0141-linked-list-cycle
0169-majority-element
0268-missing-number
0756-pyramid-transition-matrix
0840-magic-squares-in-grid
0865-smallest-subtree-with-all-the-deepest-nodes
0874-walking-robot-simulation
0961-n-repeated-element-in-size-2n-array
1015-smallest-integer-divisible-by-k
1189-maximum-number-of-balloons
1331-rank-transform-of-an-array
1345-jump-game-iv
1353-find-resultant-array-after-removing-anagrams
1358-number-of-substrings-containing-all-three-characters
1386-cinema-seat-allocation
1461-check-if-a-string-contains-all-binary-codes-of-size-k
1590-make-sum-divisible-by-p
1612-avoid-flood-in-the-city
1674-minimum-moves-to-make-array-complementary
1796-second-largest-digit-in-a-string
1930-unique-length-3-palindromic-subsequences
1980-find-unique-binary-string
2169-simple-bank-system
2174-next-greater-numerically-balanced-number
2196-create-binary-tree-from-descriptions
2274-keep-multiplying-found-values-by-two
2402-meeting-rooms-iii
2540-minimum-common-value
2615-sum-of-distances
2657-find-the-prefix-common-array-of-two-arrays
2661-smallest-missing-non-negative-integer-after-operations
2784-check-if-array-is-good
2840-check-if-strings-can-be-made-equal-with-operations-ii
2958-length-of-longest-subarray-with-at-most-k-frequency
2975-maximum-square-area-by-removing-fences-from-a-field
2996-smallest-missing-integer-greater-than-sequential-prefix-sum
3013-divide-an-array-into-subarrays-with-minimum-cost-ii
3016-minimum-number-of-pushes-to-type-word-ii
3020-find-the-maximum-number-of-elements-in-subset
3043-find-the-length-of-the-longest-common-prefix
3090-maximum-length-substring-with-two-occurrences
3120-count-the-number-of-special-characters-i
3121-count-the-number-of-special-characters-ii
3312-sorted-gcd-pair-queries
3381-maximum-subarray-sum-with-length-divisible-by-k
3437-maximum-total-damage-with-spell-casting
3471-find-the-largest-almost-missing-integer
3483-unique-3-digit-even-numbers
3488-closest-equal-element-queries
3501-delete-nodes-from-linked-list-present-in-array
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3518-smallest-palindromic-rearrangement-ii
3531-count-covered-buildings
3532-path-existence-queries-in-a-graph-i
3548-equal-sum-grid-partition-ii
3568-minimum-moves-to-clean-the-classroom
3581-the-two-sneaky-numbers-of-digitville
3583-count-special-triplets
3592-find-x-sum-of-all-k-long-subarrays-ii
3606-coupon-code-validator
3610-find-x-sum-of-all-k-long-subarrays-i
3623-count-number-of-trapezoids-i
3625-count-number-of-trapezoids-ii
3629-minimum-jumps-to-reach-end-via-prime-teleportation
3713-longest-balanced-substring-i
3714-longest-balanced-substring-ii
3718-smallest-missing-multiple-of-k
3719-longest-balanced-subarray-i
3720-lexicographically-smallest-permutation-greater-than-target
3721-longest-balanced-subarray-ii
3731-find-missing-elements
3737-count-subarrays-with-majority-element-i
3739-count-subarrays-with-majority-element-ii
3740-minimum-distance-between-three-equal-elements-i
3741-minimum-distance-between-three-equal-elements-ii
3761-minimum-absolute-distance-between-mirror-pairs
3834-minimum-operations-to-convert-all-elements-to-zero
3863-power-grid-maintenance

Math

0002-add-two-numbers
0007-reverse-integer
0009-palindrome-number
0013-roman-to-integer
0048-rotate-image
0050-powx-n
0060-permutation-sequence
0066-plus-one
0067-add-binary
0096-unique-binary-search-trees
0189-rotate-array
0204-count-primes
0258-add-digits
0268-missing-number
0396-rotate-function
0405-convert-a-number-to-hexadecimal
0486-predict-the-winner
0628-maximum-product-of-three-numbers
0762-prime-number-of-set-bits-in-binary-representation
0788-rotated-digits
0836-rectangle-overlap
0840-magic-squares-in-grid
0877-stone-game
1013-fibonacci-number
1015-smallest-integer-divisible-by-k
1140-stone-game-ii
1266-minimum-time-visiting-all-points
1344-angle-between-hands-of-a-clock
1390-four-divisors
1406-stone-game-iii
1510-stone-game-iv
1523-count-odd-numbers-in-an-interval-range
1563-stone-game-v
1621-number-of-sets-of-k-non-overlapping-line-segments
1622-fancy-sequence
1636-number-of-substrings-with-only-1s
1642-water-bottles
1680-concatenation-of-consecutive-binary-numbers
1817-calculate-money-in-leetcode-bank
1840-maximum-building-height
1872-stone-game-viii
1878-get-biggest-three-rhombus-sums-in-a-grid
1925-count-square-sum-triples
1927-sum-game
1979-find-greatest-common-divisor-of-array
2029-stone-game-ix
2033-minimum-operations-to-make-a-uni-value-grid
2110-number-of-smooth-descent-periods-of-a-stock
2147-number-of-ways-to-divide-a-long-corridor
2174-next-greater-numerically-balanced-number
2244-number-of-laser-beams-in-a-bank
2288-count-operations-to-obtain-zero
2661-smallest-missing-non-negative-integer-after-operations
2753-minimum-number-of-operations-to-make-all-array-elements-equal-to-1
2946-matrix-similarity-after-cyclic-shifts
3014-minimum-number-of-pushes-to-type-word-i
3047-find-the-largest-area-of-square-inside-two-rectangles
3116-kth-smallest-amount-with-single-denomination-combination
3190-find-minimum-operations-to-make-all-elements-divisible-by-three
3300-minimum-element-after-replacement-with-digit-sum
3312-sorted-gcd-pair-queries
3336-water-bottles-ii
3336-find-the-number-of-subsequences-with-equal-gcd
3345-smallest-divisible-digit-product-i
3348-smallest-divisible-digit-product-ii
3432-count-partitions-with-even-sum-difference
3433-count-mentions-per-user
3464-maximize-the-distance-between-points-on-a-square
3512-minimum-operations-to-make-array-sum-divisible-by-k
3513-number-of-unique-xor-triplets-i
3514-number-of-unique-xor-triplets-ii
3518-smallest-palindromic-rearrangement-ii
3536-maximum-product-of-two-digits
3558-number-of-ways-to-assign-edge-weights-i
3559-number-of-ways-to-assign-edge-weights-ii
3577-count-the-number-of-computer-unlocking-permutations
3581-the-two-sneaky-numbers-of-digitville
3622-check-divisibility-by-digit-sum-and-product
3623-count-number-of-trapezoids-i
3625-count-number-of-trapezoids-ii
3629-minimum-jumps-to-reach-end-via-prime-teleportation
3658-gcd-of-odd-and-even-sums
3676-smallest-number-with-all-set-bits
3700-number-of-zigzag-arrays-ii
3751-total-waviness-of-numbers-in-range-i
3753-total-waviness-of-numbers-in-range-ii
3754-concatenate-non-zero-digits-and-multiply-by-sum-i
3756-concatenate-non-zero-digits-and-multiply-by-sum-ii
3761-minimum-absolute-distance-between-mirror-pairs
3768-check-if-digits-are-equal-in-string-after-operations-i
3783-mirror-distance-of-an-integer
3851-find-sum-of-array-product-of-magical-sequences
3867-sum-of-gcd-of-formed-pairs
3870-count-commas-in-range
3871-count-commas-in-range-ii
3875-construct-uniform-parity-array-i
3876-construct-uniform-parity-array-ii

String

0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0006-zigzag-conversion
0008-string-to-integer-atoi
0013-roman-to-integer
0014-longest-common-prefix
0020-valid-parentheses
0028-find-the-index-of-the-first-occurrence-in-a-string
0032-longest-valid-parentheses
0058-length-of-last-word
0067-add-binary
0076-minimum-window-substring
0087-scramble-string
0091-decode-ways
0097-interleaving-string
0115-distinct-subsequences
0125-valid-palindrome
0151-reverse-words-in-a-string
0344-reverse-string
0405-convert-a-number-to-hexadecimal
0443-string-compression
0474-ones-and-zeroes
0657-robot-return-to-origin
0696-count-binary-substrings
0712-minimum-ascii-delete-sum-for-two-strings
0756-pyramid-transition-matrix
0761-special-binary-string
0796-rotate-string
0940-distinct-subsequences-ii
0944-delete-columns-to-make-sorted
0955-delete-columns-to-make-sorted-ii
0960-delete-columns-to-make-sorted-iii
1081-smallest-subsequence-of-distinct-characters
1189-maximum-number-of-balloons
1320-minimum-distance-to-type-a-word-using-two-fingers
1353-find-resultant-array-after-removing-anagrams
1358-number-of-substrings-containing-all-three-characters
1404-number-of-steps-to-reduce-a-number-in-binary-representation-to-one
1415-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1461-check-if-a-string-contains-all-binary-codes-of-size-k
1545-find-kth-bit-in-nth-binary-string
1636-number-of-substrings-with-only-1s
1653-minimum-deletions-to-make-string-balanced
1689-partitioning-into-minimum-number-of-deci-binary-numbers
1700-minimum-time-to-make-rope-colorful
1747-lexicographically-smallest-string-after-applying-operations
1758-minimum-changes-to-make-alternating-binary-string
1784-check-if-binary-string-has-at-most-one-segment-of-ones
1796-second-largest-digit-in-a-string
1871-jump-game-vii
1888-minimum-number-of-flips-to-make-the-binary-string-alternating
1927-sum-game
1930-unique-length-3-palindromic-subsequences
1967-number-of-strings-that-appear-as-substrings-in-word
1980-find-unique-binary-string
2075-decode-the-slanted-ciphertext
2137-final-value-of-variable-after-performing-operations
2147-number-of-ways-to-divide-a-long-corridor
2211-count-collisions-on-a-road
2213-longest-substring-of-one-repeating-character
2244-number-of-laser-beams-in-a-bank
2452-words-within-two-edits-of-dictionary
2472-maximum-number-of-non-overlapping-palindrome-substrings
2483-minimum-penalty-for-a-shop
2515-shortest-distance-to-target-string-in-a-circular-array
2573-find-the-string-with-lcp
2586-count-the-number-of-vowel-strings-in-range
2833-furthest-point-from-origin
2839-check-if-strings-can-be-made-equal-with-operations-i
2840-check-if-strings-can-be-made-equal-with-operations-ii
2904-shortest-and-lexicographically-smallest-beautiful-string
2976-minimum-cost-to-convert-string-i
2977-minimum-cost-to-convert-string-ii
3014-minimum-number-of-pushes-to-type-word-i
3016-minimum-number-of-pushes-to-type-word-ii
3043-find-the-length-of-the-longest-common-prefix
3090-maximum-length-substring-with-two-occurrences
3093-longest-common-suffix-queries
3120-count-the-number-of-special-characters-i
3121-count-the-number-of-special-characters-ii
3233-maximize-the-number-of-partitions-after-operations
3302-find-the-lexicographically-smallest-valid-sequence
3348-smallest-divisible-digit-product-ii
3474-lexicographically-smallest-generated-string
3479-count-the-number-of-substrings-with-dominant-ones
3499-maximize-active-section-with-trade-i
3501-maximize-active-section-with-trade-ii
3517-smallest-palindromic-rearrangement-i
3518-smallest-palindromic-rearrangement-ii
3606-coupon-code-validator
3612-process-string-with-special-operations-i
3614-process-string-with-special-operations-ii
3713-longest-balanced-substring-i
3714-longest-balanced-substring-ii
3720-lexicographically-smallest-permutation-greater-than-target
3734-lexicographically-smallest-palindromic-permutation-greater-than-target
3756-concatenate-non-zero-digits-and-multiply-by-sum-ii
3768-check-if-digits-are-equal-in-string-after-operations-i
3838-weighted-word-mapping

Array

0001-two-sum
0004-median-of-two-sorted-arrays
0011-container-with-most-water
0014-longest-common-prefix
0015-3sum
0018-4sum
0026-remove-duplicates-from-sorted-array
0027-remove-element
0031-next-permutation
0033-search-in-rotated-sorted-array
0035-search-insert-position
0039-combination-sum
0048-rotate-image
0053-maximum-subarray
0054-spiral-matrix
0055-jump-game
0056-merge-intervals
0066-plus-one
0073-set-matrix-zeroes
0075-sort-colors
0078-subsets
0085-maximal-rectangle
0088-merge-sorted-array
0090-subsets-ii
0118-pascals-triangle
0119-pascals-triangle-ii
0121-best-time-to-buy-and-sell-stock
0128-longest-consecutive-sequence
0136-single-number
0153-find-minimum-in-rotated-sorted-array
0154-find-minimum-in-rotated-sorted-array-ii
0169-majority-element
0189-rotate-array
0204-count-primes
0268-missing-number
0283-move-zeroes
0396-rotate-function
0407-trapping-rain-water-ii
0414-third-maximum-number
0417-pacific-atlantic-water-flow
0474-ones-and-zeroes
0485-max-consecutive-ones
0486-predict-the-winner
0628-maximum-product-of-three-numbers
0717-1-bit-and-2-bit-characters
0744-find-smallest-letter-greater-than-target
0759-set-intersection-size-at-least-two
0794-swim-in-rising-water
0835-image-overlap
0840-magic-squares-in-grid
0874-walking-robot-simulation
0877-stone-game
0944-delete-columns-to-make-sorted
0955-delete-columns-to-make-sorted-ii
0960-delete-columns-to-make-sorted-iii
0961-n-repeated-element-in-size-2n-array
1018-binary-prefix-divisible-by-5
1140-stone-game-ii
1200-minimum-absolute-difference
1260-shift-2d-grid
1262-greatest-sum-divisible-by-three
1266-minimum-time-visiting-all-points
1288-remove-covered-intervals
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1301-number-of-paths-with-max-score
1306-jump-game-iii
1331-rank-transform-of-an-array
1340-jump-game-v
1345-jump-game-iv
1351-count-negative-numbers-in-a-sorted-matrix
1353-find-resultant-array-after-removing-anagrams
1356-sort-integers-by-the-number-of-1-bits
1386-cinema-seat-allocation
1390-four-divisors
1391-check-if-there-is-a-valid-path-in-a-grid
1406-stone-game-iii
1458-max-dot-product-of-two-subsequences
1464-maximum-product-of-two-elements-in-an-array
1536-minimum-swaps-to-arrange-a-binary-grid
1548-check-if-all-1s-are-at-least-length-k-places-away
1559-detect-cycles-in-2d-grid
1563-stone-game-v
1582-special-positions-in-a-binary-matrix
1590-make-sum-divisible-by-p
1594-maximum-non-negative-product-in-a-matrix
1612-avoid-flood-in-the-city
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1665-minimum-initial-energy-to-finish-tasks
1674-minimum-moves-to-make-array-complementary
1700-minimum-time-to-make-rope-colorful
1722-minimize-hamming-distance-after-swap-operations
1727-largest-submatrix-with-rearrangements
1732-find-the-highest-altitude
1752-check-if-array-is-sorted-and-rotated
1833-maximum-ice-cream-bars
1840-maximum-building-height
1846-maximum-element-after-decreasing-and-rearranging
1848-minimum-distance-to-the-target-element
1855-maximum-distance-between-a-pair-of-values
1861-rotating-the-box
1872-stone-game-viii
1877-minimize-maximum-pair-sum-in-array
1878-check-if-array-is-sorted-and-rotated
1878-get-biggest-three-rhombus-sums-in-a-grid
1886-determine-whether-matrix-can-be-obtained-by-rotation
1895-largest-magic-square
1914-cyclically-rotating-a-grid
1967-number-of-strings-that-appear-as-substrings-in-word
1970-last-day-where-you-can-still-cross
1975-maximum-matrix-sum
1979-find-greatest-common-divisor-of-array
1980-find-unique-binary-string
1984-minimum-difference-between-highest-and-lowest-of-k-scores
2029-stone-game-ix
2033-minimum-operations-to-make-a-uni-value-grid
2054-two-best-non-overlapping-events
2078-two-furthest-houses-with-different-colors
2091-removing-minimum-and-maximum-from-array
2110-number-of-smooth-descent-periods-of-a-stock
2126-destroying-asteroids
2137-final-value-of-variable-after-performing-operations
2141-maximum-running-time-of-n-computers
2144-minimum-cost-of-buying-candies-with-discount
2161-partition-array-according-to-given-pivot
2169-simple-bank-system
2196-create-binary-tree-from-descriptions
2213-longest-substring-of-one-repeating-character
2244-number-of-laser-beams-in-a-bank
2271-rearrange-array-elements-by-sign
2274-keep-multiplying-found-values-by-two
2392-successful-pairs-of-spells-and-potions
2402-meeting-rooms-iii
2435-paths-in-matrix-whose-sum-is-divisible-by-k
2452-words-within-two-edits-of-dictionary
2463-minimum-total-distance-traveled
2515-shortest-distance-to-target-string-in-a-circular-array
2540-minimum-common-value
2553-separate-the-digits-in-an-array
2573-find-the-string-with-lcp
2574-left-and-right-sum-differences
2586-count-the-number-of-vowel-strings-in-range
2615-sum-of-distances
2618-maximize-the-minimum-powered-city
2657-find-the-prefix-common-array-of-two-arrays
2661-smallest-missing-non-negative-integer-after-operations
2751-robot-collisions
2753-minimum-number-of-operations-to-make-all-array-elements-equal-to-1
2770-maximum-number-of-jumps-to-reach-the-last-index
2784-check-if-array-is-good
2812-find-the-safest-path-in-a-grid
2906-construct-product-matrix
2943-maximize-area-of-square-hole-in-grid
2946-matrix-similarity-after-cyclic-shifts
2948-make-lexicographically-smallest-array-by-swapping-elements
2958-length-of-longest-subarray-with-at-most-k-frequency
2975-maximum-square-area-by-removing-fences-from-a-field
2976-minimum-cost-to-convert-string-i
2977-minimum-cost-to-convert-string-ii
2996-smallest-missing-integer-greater-than-sequential-prefix-sum
3010-divide-an-array-into-subarrays-with-minimum-cost-i
3013-divide-an-array-into-subarrays-with-minimum-cost-ii
3020-find-the-maximum-number-of-elements-in-subset
3043-find-the-length-of-the-longest-common-prefix
3047-find-the-largest-area-of-square-inside-two-rectangles
3069-distribute-elements-into-two-arrays-i
3070-count-submatrices-with-top-left-element-and-sum-less-than-k
3074-apple-redistribution-into-boxes
3075-maximize-happiness-of-selected-children
3093-longest-common-suffix-queries
3116-kth-smallest-amount-with-single-denomination-combination
3161-block-placement-queries
3190-find-minimum-operations-to-make-all-elements-divisible-by-three
3212-count-submatrices-with-equal-frequency-of-x-and-y
3225-maximum-score-from-grid-operations
3286-find-a-safe-walk-through-a-grid
3300-minimum-element-after-replacement-with-digit-sum
3312-sorted-gcd-pair-queries
3314-construct-the-minimum-bitwise-array-i
3315-construct-the-minimum-bitwise-array-ii
3336-find-the-number-of-subsequences-with-equal-gcd
3379-transformed-array
3381-maximum-subarray-sum-with-length-divisible-by-k
3383-taking-maximum-energy-from-the-mystic-dungeon
3414-maximum-score-of-non-overlapping-intervals
3418-maximum-amount-of-money-robot-can-earn
3432-count-partitions-with-even-sum-difference
3433-count-mentions-per-user
3437-maximum-total-damage-with-spell-casting
3453-separate-squares-i
3454-separate-squares-ii
3464-maximize-the-distance-between-points-on-a-square
3471-find-the-largest-almost-missing-integer
3483-unique-3-digit-even-numbers
3488-closest-equal-element-queries
3501-delete-nodes-from-linked-list-present-in-array
3501-maximize-active-section-with-trade-ii
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3512-minimum-operations-to-make-array-sum-divisible-by-k
3513-number-of-unique-xor-triplets-i
3514-number-of-unique-xor-triplets-ii
3531-count-covered-buildings
3532-path-existence-queries-in-a-graph-i
3534-path-existence-queries-in-a-graph-ii
3546-equal-sum-grid-partition-i
3548-equal-sum-grid-partition-ii
3559-number-of-ways-to-assign-edge-weights-ii
3562-maximum-profit-from-trading-stocks-with-discounts
3567-minimum-absolute-difference-in-sliding-submatrix
3568-minimum-moves-to-clean-the-classroom
3573-best-time-to-buy-and-sell-stock-v
3577-count-the-number-of-computer-unlocking-permutations
3578-count-partitions-with-max-min-difference-at-most-k
3581-the-two-sneaky-numbers-of-digitville
3583-count-special-triplets
3592-find-x-sum-of-all-k-long-subarrays-ii
3606-coupon-code-validator
3610-find-x-sum-of-all-k-long-subarrays-i
3612-adjacent-increasing-subarrays-detection-i
3616-make-array-elements-equal-to-zero
3619-adjacent-increasing-subarrays-detection-ii
3620-maximum-number-of-distinct-elements-after-operations
3620-network-recovery-pathways
3622-maximum-frequency-of-an-element-after-performing-operations-i
3623-count-number-of-trapezoids-i
3625-count-number-of-trapezoids-ii
3629-minimum-jumps-to-reach-end-via-prime-teleportation
3633-earliest-finish-time-for-land-and-water-rides-i
3634-minimum-removals-to-balance-array
3635-earliest-finish-time-for-land-and-water-rides-ii
3637-trionic-array-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3640-trionic-array-ii
3643-flip-square-submatrix-vertically
3651-minimum-cost-path-with-teleportations
3652-best-time-to-buy-and-sell-stock-using-strategy
3653-xor-after-range-multiplication-queries-i
3655-xor-after-range-multiplication-queries-ii
3660-jump-game-ix
3661-maximum-walls-destroyed-by-robots
3689-maximum-total-subarray-value-i
3702-longest-subsequence-with-non-zero-bitwise-xor
3718-smallest-missing-multiple-of-k
3719-longest-balanced-subarray-i
3721-longest-balanced-subarray-ii
3731-find-missing-elements
3737-count-subarrays-with-majority-element-i
3739-count-subarrays-with-majority-element-ii
3740-minimum-distance-between-three-equal-elements-i
3741-minimum-distance-between-three-equal-elements-ii
3742-maximum-path-score-in-a-grid
3761-minimum-absolute-distance-between-mirror-pairs
3794-find-the-minimum-amount-of-time-to-brew-potions
3834-minimum-operations-to-convert-all-elements-to-zero
3838-weighted-word-mapping
3851-find-sum-of-array-product-of-magical-sequences
3863-power-grid-maintenance
3867-sum-of-gcd-of-formed-pairs
3875-construct-uniform-parity-array-i
3876-construct-uniform-parity-array-ii
3903-smallest-stable-index-i
3904-smallest-stable-index-ii

Two Pointers

0005-longest-palindromic-substring
0011-container-with-most-water
0015-3sum
0018-4sum
0026-remove-duplicates-from-sorted-array
0027-remove-element
0028-find-the-index-of-the-first-occurrence-in-a-string
0031-next-permutation
0061-rotate-list
0075-sort-colors
0088-merge-sorted-array
0125-valid-palindrome
0141-linked-list-cycle
0151-reverse-words-in-a-string
0189-rotate-array
0283-move-zeroes
0344-reverse-string
0443-string-compression
0696-count-binary-substrings
1855-maximum-distance-between-a-pair-of-values
1861-rotating-the-box
1877-minimize-maximum-pair-sum-in-array
2095-delete-the-middle-node-of-a-linked-list
2130-maximum-twin-sum-of-a-linked-list
2161-partition-array-according-to-given-pivot
2271-rearrange-array-elements-by-sign
2392-successful-pairs-of-spells-and-potions
2472-maximum-number-of-non-overlapping-palindrome-substrings
2540-minimum-common-value
3302-find-the-lexicographically-smallest-valid-sequence
3437-maximum-total-damage-with-spell-casting
3534-path-existence-queries-in-a-graph-ii
3633-earliest-finish-time-for-land-and-water-rides-i
3635-earliest-finish-time-for-land-and-water-rides-ii
3643-flip-square-submatrix-vertically
3734-lexicographically-smallest-palindromic-permutation-greater-than-target
3867-sum-of-gcd-of-formed-pairs

Stack

0020-valid-parentheses
0032-longest-valid-parentheses
0085-maximal-rectangle
1081-smallest-subsequence-of-distinct-characters
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1653-minimum-deletions-to-make-string-balanced
2130-maximum-twin-sum-of-a-linked-list
2211-count-collisions-on-a-road
2751-robot-collisions
3834-minimum-operations-to-convert-all-elements-to-zero

String Matching

0028-find-the-index-of-the-first-occurrence-in-a-string
0796-rotate-string
3474-lexicographically-smallest-generated-string

Trie

0014-longest-common-prefix
2452-words-within-two-edits-of-dictionary
2977-minimum-cost-to-convert-string-ii
3043-find-the-length-of-the-longest-common-prefix
3093-longest-common-suffix-queries

Sorting

0015-3sum
0018-4sum
0056-merge-intervals
0075-sort-colors
0088-merge-sorted-array
0169-majority-element
0268-missing-number
0414-third-maximum-number
0628-maximum-product-of-three-numbers
0759-set-intersection-size-at-least-two
0761-special-binary-string
1200-minimum-absolute-difference
1262-greatest-sum-divisible-by-three
1288-remove-covered-intervals
1331-rank-transform-of-an-array
1340-jump-game-v
1353-find-resultant-array-after-removing-anagrams
1356-sort-integers-by-the-number-of-1-bits
1464-maximum-product-of-two-elements-in-an-array
1665-minimum-initial-energy-to-finish-tasks
1727-largest-submatrix-with-rearrangements
1833-maximum-ice-cream-bars
1840-maximum-building-height
1846-maximum-element-after-decreasing-and-rearranging
1877-minimize-maximum-pair-sum-in-array
1878-get-biggest-three-rhombus-sums-in-a-grid
1984-minimum-difference-between-highest-and-lowest-of-k-scores
2033-minimum-operations-to-make-a-uni-value-grid
2054-two-best-non-overlapping-events
2092-find-all-people-with-secret
2126-destroying-asteroids
2141-maximum-running-time-of-n-computers
2144-minimum-cost-of-buying-candies-with-discount
2274-keep-multiplying-found-values-by-two
2392-successful-pairs-of-spells-and-potions
2402-meeting-rooms-iii
2463-minimum-total-distance-traveled
2751-robot-collisions
2784-check-if-array-is-good
2840-check-if-strings-can-be-made-equal-with-operations-ii
2943-maximize-area-of-square-hole-in-grid
2948-make-lexicographically-smallest-array-by-swapping-elements
2996-smallest-missing-integer-greater-than-sequential-prefix-sum
3010-divide-an-array-into-subarrays-with-minimum-cost-i
3016-minimum-number-of-pushes-to-type-word-ii
3074-apple-redistribution-into-boxes
3075-maximize-happiness-of-selected-children
3414-maximum-score-of-non-overlapping-intervals
3433-count-mentions-per-user
3437-maximum-total-damage-with-spell-casting
3464-maximize-the-distance-between-points-on-a-square
3517-smallest-palindromic-rearrangement-i
3531-count-covered-buildings
3534-path-existence-queries-in-a-graph-ii
3536-maximum-product-of-two-digits
3567-minimum-absolute-difference-in-sliding-submatrix
3606-coupon-code-validator
3620-maximum-number-of-distinct-elements-after-operations
3622-maximum-frequency-of-an-element-after-performing-operations-i
3633-earliest-finish-time-for-land-and-water-rides-i
3634-minimum-removals-to-balance-array
3635-earliest-finish-time-for-land-and-water-rides-ii
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3661-maximum-walls-destroyed-by-robots
3731-find-missing-elements
3867-sum-of-gcd-of-formed-pairs

Bit Manipulation

0067-add-binary
0078-subsets
0090-subsets-ii
0136-single-number
0190-reverse-bits
0191-number-of-1-bits
0268-missing-number
0401-binary-watch
0405-convert-a-number-to-hexadecimal
0693-binary-number-with-alternating-bits
0756-pyramid-transition-matrix
0762-prime-number-of-set-bits-in-binary-representation
0868-binary-gap
1009-complement-of-base-10-integer
1018-binary-prefix-divisible-by-5
1356-sort-integers-by-the-number-of-1-bits
1386-cinema-seat-allocation
1404-number-of-steps-to-reduce-a-number-in-binary-representation-to-one
1461-check-if-a-string-contains-all-binary-codes-of-size-k
1680-concatenation-of-consecutive-binary-numbers
1732-minimum-one-bit-operations-to-make-integers-zero
1930-unique-length-3-palindromic-subsequences
2657-find-the-prefix-common-array-of-two-arrays
3116-kth-smallest-amount-with-single-denomination-combination
3233-maximize-the-number-of-partitions-after-operations
3314-construct-the-minimum-bitwise-array-i
3315-construct-the-minimum-bitwise-array-ii
3513-number-of-unique-xor-triplets-i
3514-number-of-unique-xor-triplets-ii
3534-path-existence-queries-in-a-graph-ii
3559-number-of-ways-to-assign-edge-weights-ii
3568-minimum-moves-to-clean-the-classroom
3676-smallest-number-with-all-set-bits
3702-longest-subsequence-with-non-zero-bitwise-xor
3851-find-sum-of-array-product-of-magical-sequences

Dynamic Programming

0005-longest-palindromic-substring
0032-longest-valid-parentheses
0053-maximum-subarray
0055-jump-game
0085-maximal-rectangle
0087-scramble-string
0091-decode-ways
0095-unique-binary-search-trees-ii
0096-unique-binary-search-trees
0097-interleaving-string
0115-distinct-subsequences
0118-pascals-triangle
0119-pascals-triangle-ii
0121-best-time-to-buy-and-sell-stock
0396-rotate-function
0474-ones-and-zeroes
0486-predict-the-winner
0712-minimum-ascii-delete-sum-for-two-strings
0788-rotated-digits
0799-champagne-tower
0806-domino-and-tromino-tiling
0877-stone-game
0940-distinct-subsequences-ii
0960-delete-columns-to-make-sorted-iii
1013-fibonacci-number
1140-stone-game-ii
1262-greatest-sum-divisible-by-three
1301-number-of-paths-with-max-score
1320-minimum-distance-to-type-a-word-using-two-fingers
1340-jump-game-v
1406-stone-game-iii
1411-number-of-ways-to-paint-n-3-grid
1458-max-dot-product-of-two-subsequences
1510-stone-game-iv
1563-stone-game-v
1594-maximum-non-negative-product-in-a-matrix
1621-number-of-sets-of-k-non-overlapping-line-segments
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1653-minimum-deletions-to-make-string-balanced
1700-minimum-time-to-make-rope-colorful
1732-minimum-one-bit-operations-to-make-integers-zero
1871-jump-game-vii
1872-stone-game-viii
1888-minimum-number-of-flips-to-make-the-binary-string-alternating
2054-two-best-non-overlapping-events
2110-number-of-smooth-descent-periods-of-a-stock
2147-number-of-ways-to-divide-a-long-corridor
2435-paths-in-matrix-whose-sum-is-divisible-by-k
2463-minimum-total-distance-traveled
2472-maximum-number-of-non-overlapping-palindrome-substrings
2573-find-the-string-with-lcp
2770-maximum-number-of-jumps-to-reach-the-last-index
2977-minimum-cost-to-convert-string-ii
3129-find-all-possible-stable-binary-arrays-i
3130-find-all-possible-stable-binary-arrays-ii
3225-maximum-score-from-grid-operations
3233-maximize-the-number-of-partitions-after-operations
3302-find-the-lexicographically-smallest-valid-sequence
3336-find-the-number-of-subsequences-with-equal-gcd
3414-maximum-score-of-non-overlapping-intervals
3418-maximum-amount-of-money-robot-can-earn
3437-maximum-total-damage-with-spell-casting
3534-path-existence-queries-in-a-graph-ii
3559-number-of-ways-to-assign-edge-weights-ii
3562-maximum-profit-from-trading-stocks-with-discounts
3573-best-time-to-buy-and-sell-stock-v
3578-count-partitions-with-max-min-difference-at-most-k
3620-network-recovery-pathways
3640-trionic-array-ii
3651-minimum-cost-path-with-teleportations
3660-jump-game-ix
3661-maximum-walls-destroyed-by-robots
3699-number-of-zigzag-arrays-i
3700-number-of-zigzag-arrays-ii
3742-maximum-path-score-in-a-grid
3751-total-waviness-of-numbers-in-range-i
3753-total-waviness-of-numbers-in-range-ii
3851-find-sum-of-array-product-of-magical-sequences

Binary Search

0004-median-of-two-sorted-arrays
0033-search-in-rotated-sorted-array
0035-search-insert-position
0153-find-minimum-in-rotated-sorted-array
0154-find-minimum-in-rotated-sorted-array-ii
0268-missing-number
0744-find-smallest-letter-greater-than-target
0794-swim-in-rising-water
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1351-count-negative-numbers-in-a-sorted-matrix
1612-avoid-flood-in-the-city
1855-maximum-distance-between-a-pair-of-values
1970-last-day-where-you-can-still-cross
2054-two-best-non-overlapping-events
2141-maximum-running-time-of-n-computers
2392-successful-pairs-of-spells-and-potions
2540-minimum-common-value
2618-maximize-the-minimum-powered-city
2812-find-the-safest-path-in-a-grid
3116-kth-smallest-amount-with-single-denomination-combination
3161-block-placement-queries
3312-sorted-gcd-pair-queries
3414-maximum-score-of-non-overlapping-intervals
3437-maximum-total-damage-with-spell-casting
3453-separate-squares-i
3454-separate-squares-ii
3464-maximize-the-distance-between-points-on-a-square
3488-closest-equal-element-queries
3501-maximize-active-section-with-trade-ii
3532-path-existence-queries-in-a-graph-i
3534-path-existence-queries-in-a-graph-ii
3600-maximize-spanning-tree-stability-with-upgrades
3619-adjacent-increasing-subarrays-detection-ii
3620-network-recovery-pathways
3622-maximum-frequency-of-an-element-after-performing-operations-i
3633-earliest-finish-time-for-land-and-water-rides-i
3635-earliest-finish-time-for-land-and-water-rides-ii
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3661-maximum-walls-destroyed-by-robots

Tree

0095-unique-binary-search-trees-ii
0096-unique-binary-search-trees
0099-recover-binary-search-tree
0100-same-tree
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0112-path-sum
0865-smallest-subtree-with-all-the-deepest-nodes
1022-sum-of-root-to-leaf-binary-numbers
1161-maximum-level-sum-of-a-binary-tree
1339-maximum-product-of-splitted-binary-tree
1382-balance-a-binary-search-tree
2196-create-binary-tree-from-descriptions
2265-count-nodes-equal-to-average-of-subtree
2872-maximum-number-of-k-divisible-components
3558-number-of-ways-to-assign-edge-weights-i
3559-number-of-ways-to-assign-edge-weights-ii
3562-maximum-profit-from-trading-stocks-with-discounts

Depth-First Search

0099-recover-binary-search-tree
0100-same-tree
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0112-path-sum
0417-pacific-atlantic-water-flow
0794-swim-in-rising-water
0865-smallest-subtree-with-all-the-deepest-nodes
1022-sum-of-root-to-leaf-binary-numbers
1161-maximum-level-sum-of-a-binary-tree
1306-jump-game-iii
1339-maximum-product-of-splitted-binary-tree
1382-balance-a-binary-search-tree
1391-check-if-there-is-a-valid-path-in-a-grid
1559-detect-cycles-in-2d-grid
1722-minimize-hamming-distance-after-swap-operations
1747-lexicographically-smallest-string-after-applying-operations
1970-last-day-where-you-can-still-cross
2092-find-all-people-with-secret
2265-count-nodes-equal-to-average-of-subtree
2492-minimum-score-of-a-path-between-two-cities
2685-count-the-number-of-complete-components
2872-maximum-number-of-k-divisible-components
3310-remove-methods-from-project
3558-number-of-ways-to-assign-edge-weights-i
3559-number-of-ways-to-assign-edge-weights-ii
3562-maximum-profit-from-trading-stocks-with-discounts
3863-power-grid-maintenance

Breadth-First Search

0100-same-tree
0111-minimum-depth-of-binary-tree
0112-path-sum
0407-trapping-rain-water-ii
0417-pacific-atlantic-water-flow
0794-swim-in-rising-water
0865-smallest-subtree-with-all-the-deepest-nodes
1161-maximum-level-sum-of-a-binary-tree
1306-jump-game-iii
1345-jump-game-iv
1391-check-if-there-is-a-valid-path-in-a-grid
1559-detect-cycles-in-2d-grid
1747-lexicographically-smallest-string-after-applying-operations
1970-last-day-where-you-can-still-cross
2092-find-all-people-with-secret
2492-minimum-score-of-a-path-between-two-cities
2685-count-the-number-of-complete-components
2812-find-the-safest-path-in-a-grid
3286-find-a-safe-walk-through-a-grid
3310-remove-methods-from-project
3568-minimum-moves-to-clean-the-classroom
3629-minimum-jumps-to-reach-end-via-prime-teleportation
3863-power-grid-maintenance

Binary Tree

0095-unique-binary-search-trees-ii
0096-unique-binary-search-trees
0099-recover-binary-search-tree
0100-same-tree
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0112-path-sum
0865-smallest-subtree-with-all-the-deepest-nodes
1022-sum-of-root-to-leaf-binary-numbers
1161-maximum-level-sum-of-a-binary-tree
1339-maximum-product-of-splitted-binary-tree
1382-balance-a-binary-search-tree
2196-create-binary-tree-from-descriptions
2265-count-nodes-equal-to-average-of-subtree

Enumeration

0204-count-primes
1291-sequential-digits
1747-lexicographically-smallest-string-after-applying-operations
1925-count-square-sum-triples
2174-next-greater-numerically-balanced-number
2975-maximum-square-area-by-removing-fences-from-a-field
3010-divide-an-array-into-subarrays-with-minimum-cost-i
3020-find-the-maximum-number-of-elements-in-subset
3345-smallest-divisible-digit-product-i
3479-count-the-number-of-substrings-with-dominant-ones
3483-unique-3-digit-even-numbers
3499-maximize-active-section-with-trade-i
3514-number-of-unique-xor-triplets-ii
3546-equal-sum-grid-partition-i
3548-equal-sum-grid-partition-ii
3713-longest-balanced-substring-i
3720-lexicographically-smallest-permutation-greater-than-target
3734-lexicographically-smallest-palindromic-permutation-greater-than-target
3751-total-waviness-of-numbers-in-range-i

Number Theory

0204-count-primes
0258-add-digits
1979-find-greatest-common-divisor-of-array
2753-minimum-number-of-operations-to-make-all-array-elements-equal-to-1
3116-kth-smallest-amount-with-single-denomination-combination
3312-sorted-gcd-pair-queries
3336-find-the-number-of-subsequences-with-equal-gcd
3348-smallest-divisible-digit-product-ii
3629-minimum-jumps-to-reach-end-via-prime-teleportation
3658-gcd-of-odd-and-even-sums
3768-check-if-digits-are-equal-in-string-after-operations-i
3867-sum-of-gcd-of-formed-pairs

Recursion

0002-add-two-numbers
0050-powx-n
0060-permutation-sequence
0206-reverse-linked-list
0486-predict-the-winner
1013-fibonacci-number
1545-find-kth-bit-in-nth-binary-string
3483-unique-3-digit-even-numbers

Memoization

1013-fibonacci-number
1732-minimum-one-bit-operations-to-make-integers-zero

Divide and Conquer

0004-median-of-two-sorted-arrays
0053-maximum-subarray
0169-majority-element
0190-reverse-bits
0191-number-of-1-bits
0761-special-binary-string
1382-balance-a-binary-search-tree
3653-xor-after-range-multiplication-queries-i
3655-xor-after-range-multiplication-queries-ii
3719-longest-balanced-subarray-i
3721-longest-balanced-subarray-ii
3737-count-subarrays-with-majority-element-i
3739-count-subarrays-with-majority-element-ii

Counting

0169-majority-element
1189-maximum-number-of-balloons
1356-sort-integers-by-the-number-of-1-bits
2029-stone-game-ix
2174-next-greater-numerically-balanced-number
2586-count-the-number-of-vowel-strings-in-range
2833-furthest-point-from-origin
3016-minimum-number-of-pushes-to-type-word-ii
3312-sorted-gcd-pair-queries
3437-maximum-total-damage-with-spell-casting
3518-smallest-palindromic-rearrangement-ii
3583-count-special-triplets
3713-longest-balanced-substring-i
3720-lexicographically-smallest-permutation-greater-than-target
3737-count-subarrays-with-majority-element-i

Simulation

0054-spiral-matrix
0067-add-binary
0258-add-digits
0657-robot-return-to-origin
0874-walking-robot-simulation
1260-shift-2d-grid
1404-number-of-steps-to-reduce-a-number-in-binary-representation-to-one
1545-find-kth-bit-in-nth-binary-string
1642-water-bottles
1680-concatenation-of-consecutive-binary-numbers
1914-cyclically-rotating-a-grid
2069-walking-robot-simulation-ii
2075-decode-the-slanted-ciphertext
2137-final-value-of-variable-after-performing-operations
2161-partition-array-according-to-given-pivot
2169-simple-bank-system
2211-count-collisions-on-a-road
2271-rearrange-array-elements-by-sign
2274-keep-multiplying-found-values-by-two
2288-count-operations-to-obtain-zero
2402-meeting-rooms-iii
2553-separate-the-digits-in-an-array
2751-robot-collisions
2946-matrix-similarity-after-cyclic-shifts
3069-distribute-elements-into-two-arrays-i
3336-water-bottles-ii
3379-transformed-array
3433-count-mentions-per-user
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3612-process-string-with-special-operations-i
3614-process-string-with-special-operations-ii
3616-make-array-elements-equal-to-zero
3653-xor-after-range-multiplication-queries-i
3768-check-if-digits-are-equal-in-string-after-operations-i
3794-find-the-minimum-amount-of-time-to-brew-potions
3838-weighted-word-mapping
3867-sum-of-gcd-of-formed-pairs

Union Find

0128-longest-consecutive-sequence
0794-swim-in-rising-water
1970-last-day-where-you-can-still-cross
2092-find-all-people-with-secret
3863-power-grid-maintenance

Matrix

0048-rotate-image
0054-spiral-matrix
0073-set-matrix-zeroes
0085-maximal-rectangle
0407-trapping-rain-water-ii
0417-pacific-atlantic-water-flow
0794-swim-in-rising-water
0835-image-overlap
0840-magic-squares-in-grid
1260-shift-2d-grid
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1301-number-of-paths-with-max-score
1351-count-negative-numbers-in-a-sorted-matrix
1391-check-if-there-is-a-valid-path-in-a-grid
1536-minimum-swaps-to-arrange-a-binary-grid
1559-detect-cycles-in-2d-grid
1582-special-positions-in-a-binary-matrix
1594-maximum-non-negative-product-in-a-matrix
1727-largest-submatrix-with-rearrangements
1861-rotating-the-box
1878-get-biggest-three-rhombus-sums-in-a-grid
1886-determine-whether-matrix-can-be-obtained-by-rotation
1895-largest-magic-square
1914-cyclically-rotating-a-grid
1970-last-day-where-you-can-still-cross
1975-maximum-matrix-sum
2033-minimum-operations-to-make-a-uni-value-grid
2244-number-of-laser-beams-in-a-bank
2435-paths-in-matrix-whose-sum-is-divisible-by-k
2573-find-the-string-with-lcp
2812-find-the-safest-path-in-a-grid
2906-construct-product-matrix
2946-matrix-similarity-after-cyclic-shifts
3070-count-submatrices-with-top-left-element-and-sum-less-than-k
3212-count-submatrices-with-equal-frequency-of-x-and-y
3225-maximum-score-from-grid-operations
3286-find-a-safe-walk-through-a-grid
3418-maximum-amount-of-money-robot-can-earn
3546-equal-sum-grid-partition-i
3548-equal-sum-grid-partition-ii
3567-minimum-absolute-difference-in-sliding-submatrix
3568-minimum-moves-to-clean-the-classroom
3643-flip-square-submatrix-vertically
3651-minimum-cost-path-with-teleportations
3742-maximum-path-score-in-a-grid

Heap (Priority Queue)

0407-trapping-rain-water-ii
0794-swim-in-rising-water
1464-maximum-product-of-two-elements-in-an-array
1612-avoid-flood-in-the-city
1878-get-biggest-three-rhombus-sums-in-a-grid
2054-two-best-non-overlapping-events
2402-meeting-rooms-iii
2812-find-the-safest-path-in-a-grid
3013-divide-an-array-into-subarrays-with-minimum-cost-ii
3286-find-a-safe-walk-through-a-grid
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3592-find-x-sum-of-all-k-long-subarrays-ii
3610-find-x-sum-of-all-k-long-subarrays-i
3620-network-recovery-pathways
3650-minimum-cost-path-with-edge-reversals
3863-power-grid-maintenance

Greedy

0011-container-with-most-water
0055-jump-game
0759-set-intersection-size-at-least-two
0955-delete-columns-to-make-sorted-ii
1081-smallest-subsequence-of-distinct-characters
1262-greatest-sum-divisible-by-three
1382-balance-a-binary-search-tree
1386-cinema-seat-allocation
1536-minimum-swaps-to-arrange-a-binary-grid
1612-avoid-flood-in-the-city
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1665-minimum-initial-energy-to-finish-tasks
1689-partitioning-into-minimum-number-of-deci-binary-numbers
1700-minimum-time-to-make-rope-colorful
1727-largest-submatrix-with-rearrangements
1833-maximum-ice-cream-bars
1846-maximum-element-after-decreasing-and-rearranging
1877-minimize-maximum-pair-sum-in-array
1927-sum-game
1975-maximum-matrix-sum
2029-stone-game-ix
2078-two-furthest-houses-with-different-colors
2091-removing-minimum-and-maximum-from-array
2126-destroying-asteroids
2141-maximum-running-time-of-n-computers
2144-minimum-cost-of-buying-candies-with-discount
2472-maximum-number-of-non-overlapping-palindrome-substrings
2573-find-the-string-with-lcp
2618-maximize-the-minimum-powered-city
2661-smallest-missing-non-negative-integer-after-operations
3014-minimum-number-of-pushes-to-type-word-i
3016-minimum-number-of-pushes-to-type-word-ii
3074-apple-redistribution-into-boxes
3075-maximize-happiness-of-selected-children
3302-find-the-lexicographically-smallest-valid-sequence
3348-smallest-divisible-digit-product-ii
3474-lexicographically-smallest-generated-string
3534-path-existence-queries-in-a-graph-ii
3600-maximize-spanning-tree-stability-with-upgrades
3620-maximum-number-of-distinct-elements-after-operations
3633-earliest-finish-time-for-land-and-water-rides-i
3635-earliest-finish-time-for-land-and-water-rides-ii
3689-maximum-total-subarray-value-i
3720-lexicographically-smallest-permutation-greater-than-target
3834-minimum-operations-to-convert-all-elements-to-zero

Prefix Sum

1140-stone-game-ii
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1590-make-sum-divisible-by-p
1621-number-of-sets-of-k-non-overlapping-line-segments
1674-minimum-moves-to-make-array-complementary
1732-find-the-highest-altitude
1871-jump-game-vii
1872-stone-game-viii
1878-get-biggest-three-rhombus-sums-in-a-grid
1895-largest-magic-square
1930-unique-length-3-palindromic-subsequences
2483-minimum-penalty-for-a-shop
2574-left-and-right-sum-differences
2615-sum-of-distances
2618-maximize-the-minimum-powered-city
2906-construct-product-matrix
3070-count-submatrices-with-top-left-element-and-sum-less-than-k
3129-find-all-possible-stable-binary-arrays-i
3130-find-all-possible-stable-binary-arrays-ii
3212-count-submatrices-with-equal-frequency-of-x-and-y
3225-maximum-score-from-grid-operations
3312-sorted-gcd-pair-queries
3381-maximum-subarray-sum-with-length-divisible-by-k
3383-taking-maximum-energy-from-the-mystic-dungeon
3432-count-partitions-with-even-sum-difference
3546-equal-sum-grid-partition-i
3548-equal-sum-grid-partition-ii
3578-count-partitions-with-max-min-difference-at-most-k
3616-make-array-elements-equal-to-zero
3622-maximum-frequency-of-an-element-after-performing-operations-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3652-best-time-to-buy-and-sell-stock-using-strategy
3699-number-of-zigzag-arrays-i
3714-longest-balanced-substring-ii
3719-longest-balanced-subarray-i
3721-longest-balanced-subarray-ii
3737-count-subarrays-with-majority-element-i
3739-count-subarrays-with-majority-element-ii
3756-concatenate-non-zero-digits-and-multiply-by-sum-ii
3794-find-the-minimum-amount-of-time-to-brew-potions
3903-smallest-stable-index-i
3904-smallest-stable-index-ii

Combinatorics

1621-number-of-sets-of-k-non-overlapping-line-segments
3116-kth-smallest-amount-with-single-denomination-combination
3312-sorted-gcd-pair-queries
3518-smallest-palindromic-rearrangement-ii
3577-count-the-number-of-computer-unlocking-permutations
3768-check-if-digits-are-equal-in-string-after-operations-i
3851-find-sum-of-array-product-of-magical-sequences

Bitmask

3233-maximize-the-number-of-partitions-after-operations
3851-find-sum-of-array-product-of-magical-sequences

Sliding Window

0003-longest-substring-without-repeating-characters
0076-minimum-window-substring
1358-number-of-substrings-containing-all-three-characters
1871-jump-game-vii
1888-minimum-number-of-flips-to-make-the-binary-string-alternating
1984-minimum-difference-between-highest-and-lowest-of-k-scores
2618-maximize-the-minimum-powered-city
2904-shortest-and-lexicographically-smallest-beautiful-string
2958-length-of-longest-subarray-with-at-most-k-frequency
3013-divide-an-array-into-subarrays-with-minimum-cost-ii
3090-maximum-length-substring-with-two-occurrences
3479-count-the-number-of-substrings-with-dominant-ones
3578-count-partitions-with-max-min-difference-at-most-k
3592-find-x-sum-of-all-k-long-subarrays-ii
3610-find-x-sum-of-all-k-long-subarrays-i
3622-maximum-frequency-of-an-element-after-performing-operations-i
3634-minimum-removals-to-balance-array
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3652-best-time-to-buy-and-sell-stock-using-strategy

Backtracking

0039-combination-sum
0078-subsets
0090-subsets-ii
0095-unique-binary-search-trees-ii
0401-binary-watch
0756-pyramid-transition-matrix
1415-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1980-find-unique-binary-string
2174-next-greater-numerically-balanced-number
3348-smallest-divisible-digit-product-ii

Design

1622-fancy-sequence
2069-walking-robot-simulation-ii
2169-simple-bank-system

Monotonic Stack

0085-maximal-rectangle
1081-smallest-subsequence-of-distinct-characters
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
3834-minimum-operations-to-convert-all-elements-to-zero

Linked List

0002-add-two-numbers
0061-rotate-list
0092-reverse-linked-list-ii
0141-linked-list-cycle
0206-reverse-linked-list
0237-delete-node-in-a-linked-list
2058-find-the-minimum-and-maximum-number-of-nodes-between-critical-points
2095-delete-the-middle-node-of-a-linked-list
2130-maximum-twin-sum-of-a-linked-list
3501-delete-nodes-from-linked-list-present-in-array
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii

Graph

2092-find-all-people-with-secret
3863-power-grid-maintenance

Ordered Set

2213-longest-substring-of-one-repeating-character
3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii
3863-power-grid-maintenance

Queue

2618-maximize-the-minimum-powered-city
3578-count-partitions-with-max-min-difference-at-most-k

Binary Search Tree

0095-unique-binary-search-trees-ii
0096-unique-binary-search-trees
0099-recover-binary-search-tree
1382-balance-a-binary-search-tree

Geometry

0836-rectangle-overlap
1266-minimum-time-visiting-all-points
3047-find-the-largest-area-of-square-inside-two-rectangles
3464-maximize-the-distance-between-points-on-a-square
3623-count-number-of-trapezoids-i
3625-count-number-of-trapezoids-ii

Monotonic Queue

3578-count-partitions-with-max-min-difference-at-most-k

Brainteaser

3577-count-the-number-of-computer-unlocking-permutations

Segment Tree

1622-fancy-sequence
2213-longest-substring-of-one-repeating-character
3161-block-placement-queries
3454-separate-squares-ii
3501-maximize-active-section-with-trade-ii
3719-longest-balanced-subarray-i
3721-longest-balanced-subarray-ii
3737-count-subarrays-with-majority-element-i
3739-count-subarrays-with-majority-element-ii

Line Sweep

3454-separate-squares-ii

Doubly-Linked List

3507-minimum-pair-removal-to-sort-array-i
3510-minimum-pair-removal-to-sort-array-ii

Graph Theory

2492-minimum-score-of-a-path-between-two-cities
2685-count-the-number-of-complete-components
2976-minimum-cost-to-convert-string-i
2977-minimum-cost-to-convert-string-ii
3286-find-a-safe-walk-through-a-grid
3310-remove-methods-from-project
3532-path-existence-queries-in-a-graph-i
3534-path-existence-queries-in-a-graph-ii
3600-maximize-spanning-tree-stability-with-upgrades
3620-network-recovery-pathways
3650-minimum-cost-path-with-edge-reversals

Shortest Path

2976-minimum-cost-to-convert-string-i
2977-minimum-cost-to-convert-string-ii
3286-find-a-safe-walk-through-a-grid
3620-network-recovery-pathways
3650-minimum-cost-path-with-edge-reversals

Rolling Hash

1461-check-if-a-string-contains-all-binary-codes-of-size-k

Hash Function

1461-check-if-a-string-contains-all-binary-codes-of-size-k

Union-Find

1391-check-if-there-is-a-valid-path-in-a-grid
1559-detect-cycles-in-2d-grid
1722-minimize-hamming-distance-after-swap-operations
2492-minimum-score-of-a-path-between-two-cities
2573-find-the-string-with-lcp
2685-count-the-number-of-complete-components
2812-find-the-safest-path-in-a-grid
2948-make-lexicographically-smallest-array-by-swapping-elements
3532-path-existence-queries-in-a-graph-i
3600-maximize-spanning-tree-stability-with-upgrades

Minimum Spanning Tree

3600-maximize-spanning-tree-stability-with-upgrades

Binary Indexed Tree

3161-block-placement-queries

Counting Sort

1833-maximum-ice-cream-bars
3517-smallest-palindromic-rearrangement-i

Merge Sort

3737-count-subarrays-with-majority-element-i
3739-count-subarrays-with-majority-element-ii

Topological Sort

3620-network-recovery-pathways

Game Theory

0486-predict-the-winner
0877-stone-game
1140-stone-game-ii
1406-stone-game-iii
1510-stone-game-iv
1563-stone-game-v
1872-stone-game-viii
1927-sum-game
2029-stone-game-ix

Minimax

1140-stone-game-ii
1406-stone-game-iii
1510-stone-game-iv
1872-stone-game-viii
2029-stone-game-ix

Zero-Sum Game

1140-stone-game-ii
1406-stone-game-iii
1510-stone-game-iv
1872-stone-game-viii
2029-stone-game-ix

Nim Game

1510-stone-game-iv
2029-stone-game-ix

Sprague–Grundy Theorem

1510-stone-game-iv