Master DSA Topics - January, 2026

Practice problems across 75+ categories

All Coding Problems

Practice coding problems across all companies and topics 3600 problems | 879 Easy | 1856 Medium | 842 Hard

# Problem Difficulty Topics
571 Count of Substrings Containing Every Vowel and K Consonants II Medium
Hash TableStringSliding Window
572 Count Operations to Obtain Zero Easy
MathSimulation
573 Count Pairs in Two Arrays Medium
ArrayTwo PointersBinary Search
574 Count Pairs of Connectable Servers in a Weighted Tree Network Medium
ArrayTreeDepth-First Search
575 Count Pairs of Equal Substrings With Minimum Difference Medium
Hash TableStringGreedy
576 Count Pairs Of Nodes Hard
ArrayHash TableTwo Pointers
577 Count Pairs of Points With Distance k Medium
ArrayHash TableBit Manipulation
578 Count Pairs Of Similar Strings Easy
ArrayHash TableString
579 Count Pairs That Form a Complete Day I Easy
ArrayHash TableCounting
580 Count Pairs That Form a Complete Day II Medium
ArrayHash TableCounting
581 Count Pairs Whose Sum is Less than Target Easy
ArrayTwo PointersBinary Search
582 Count Pairs With XOR in a Range Hard
ArrayBit ManipulationTrie
583 Count Palindromic Subsequences Hard
StringDynamic Programming
584 Count Partitions with Even Sum Difference Easy
ArrayMathPrefix Sum
585 Count Partitions With Max-Min Difference at Most K Medium
ArrayDynamic ProgrammingQueue
Showing 571-585 of 3600
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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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