Counting Coding Practice Problems | TutorialsPoint

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Master DSA Topics - January, 2026

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Counting Coding Problems

Practice problems frequently asked at Counting • 166 problems | 58 Easy | 87 Medium | 20 Hard

#	Problem	Difficulty	Topics
1	3Sum With Multiplicity	Medium	ArrayHash TableTwo Pointers
2	Apply Operations to Make String Empty	Medium	ArrayHash TableSorting
3	Best Poker Hand	Easy	ArrayHash TableCounting
4	Better Compression of String	Medium	Hash TableStringSorting
5	Bulls and Cows	Medium	Hash TableStringCounting
6	Change Minimum Characters to Satisfy One of Three Conditions	Medium	Hash TableStringCounting
7	Check if All Characters Have Equal Number of Occurrences	Easy	Hash TableStringCounting
8	Check if Any Element Has Prime Frequency	Easy	ArrayHash TableMath
9	Check If Array Pairs Are Divisible by k	Medium	ArrayHash TableCounting
10	Check if Number Has Equal Digit Count and Digit Value	Easy	Hash TableStringCounting
11	Check if One String Swap Can Make Strings Equal	Easy	Hash TableStringCounting
12	Check If Two Expression Trees are Equivalent	Medium	Hash TableTreeDepth-First Search
13	Check Whether Two Strings are Almost Equivalent	Easy	Hash TableStringCounting
14	Construct K Palindrome Strings	Medium	Hash TableStringGreedy
15	Construct String With Repeat Limit	Medium	Hash TableStringGreedy

Showing 1-15 of 166

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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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