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Code practices in algorithmic, and coding challenges.

Big O Complexities cheatsheet:

Data Structure Time Complexity Space Complexity
Worst Worst
Access Search Insertion Deletion
Array O(1) O(n) O(n) O(n) O(n)
Stack O(n) O(n) O(1) O(1) O(n)
Queue O(n) O(n) O(1) O(1) O(n)
Singly-Linked List O(n) O(n) O(1) O(1) O(n)
Doubly-Linked List O(n) O(n) O(1) O(1) O(n)
Hash Table N/A O(n) O(n) O(n) O(n)
Binary Search Tree O(n) O(n) O(n) O(n) O(n)
B-Tree O(log(n)) O(log(n)) O(log(n)) O(log(n)) O(n)
AVL Tree O(log(n)) O(log(n)) O(log(n)) O(log(n)) O(n)
Array Sorting Algorithms
Quicksort Ω(n log(n)) / O(n^2) O(log(n))
Heapsort O(n log(n)) O(1)
Mergesort O(n log(n)) O(n)
Counting Sort O(n+k) O(k)
Selection Sort O(n^2) O(1)
Binary search algorithm(Only sorted Arr) O(log(n)) O(1)
Graph Algorithms
Tree traversal O(N + N-1) O(N)
Dijkstra O(E+VlogV) O(V^2)
Breadth first search O(E+V) O(V)
Depth first search O(E+V) O(V)
Bellman Ford O(EV) O(V)

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