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Master DSA Topics - January, 2026

Practice problems across 75+ categories

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Combinatorics Coding Problems

Practice problems frequently asked at Combinatorics • 55 problems | 3 Easy | 18 Medium | 34 Hard

#	Problem	Difficulty	Topics
31	Kth Smallest Instructions	Hard	ArrayMathDynamic Programming
32	Manhattan Distances of All Arrangements of Pieces	Hard	MathCombinatorics
33	Maximum and Minimum Sums of at Most Size K Subsequences	Medium	ArrayMathDynamic Programming
34	Minimum Number of Operations to Make String Sorted	Hard	MathStringCombinatorics
35	Number of Music Playlists	Hard	MathDynamic ProgrammingCombinatorics
36	Number of Sets of K Non-Overlapping Line Segments	Medium	MathDynamic ProgrammingCombinatorics
37	Number of Strings Which Can Be Rearranged to Contain Substring	Medium	MathDynamic ProgrammingCombinatorics
38	Number of Subsequences with Odd Sum	Medium	ArrayMathDynamic Programming
39	Number of Ways to Reach a Position After Exactly k Steps	Medium	MathDynamic ProgrammingCombinatorics
40	Number of Ways to Reach Destination in the Grid	Hard	MathDynamic ProgrammingCombinatorics
41	Number of Ways to Rearrange Sticks With K Sticks Visible	Hard	MathDynamic ProgrammingCombinatorics
42	Number of Ways to Reorder Array to Get Same BST	Hard	ArrayMathDivide and Conquer
43	Permutations IV	Hard	ArrayMathCombinatorics
44	Poor Pigs	Hard	MathDynamic ProgrammingCombinatorics
45	Probability of a Two Boxes Having The Same Number of Distinct Balls	Hard	ArrayMathDynamic Programming

Showing 31-45 of 55

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public class MyFirstJavaProgram { Edit & Run

/* This is my first java program.

* This will print 'Hello, World!' as the output

*/

public static void main(String []args) {

System.out.println("Hello, World!"); // prints

}

}

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