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Master DSA Topics - January, 2026

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Combinatorics Coding Problems

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

#	Problem	Difficulty	Topics
46	Right Triangles	Medium	ArrayHash TableMath
47	Smallest Palindromic Rearrangement II	Hard	Hash TableMathString
48	Sorted GCD Pair Queries	Hard	ArrayHash TableMath
49	Subsequences with a Unique Middle Mode I	Hard	ArrayHash TableMath
50	Subsequences with a Unique Middle Mode II	Hard	ArrayHash TableMath
51	Sum of All Subset XOR Totals	Easy	ArrayMathBacktracking
52	The Number of Beautiful Subsets	Medium	ArrayHash TableMath
53	Ugly Number III	Medium	MathBinary SearchCombinatorics
54	Unique Paths	Medium	MathDynamic ProgrammingCombinatorics
55	Vowels of All Substrings	Medium	MathStringDynamic Programming

Showing 46-55 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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