Master DSA Topics - April, 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
646 Count Students Who Completed All Assignments Easy
ArrayHash TableCounting
647 Count Sub Islands Medium
ArrayDepth-First SearchBreadth-First Search
648 Count Subarrays of Length Three With a Condition Easy
Array
649 Count Subarrays Where Max Element Appears at Least K Times Medium
ArraySliding Window
650 Count Subarrays With Fixed Bounds Hard
ArrayQueueSliding Window
651 Count Subarrays With Median K Hard
ArrayHash TablePrefix Sum
652 Count Subarrays With More Ones Than Zeros Medium
ArrayHash TableBinary Search
653 Count Subarrays With Score Less Than K Hard
ArrayBinary SearchSliding Window
654 Count Submatrices With All Ones Medium
ArrayDynamic ProgrammingStack
655 Count Submatrices With Equal Frequency of X and Y Medium
ArrayMatrixPrefix Sum
656 Count Submatrices with Top-Left Element and Sum Less Than k Medium
ArrayMatrixPrefix Sum
657 Count Substrings Divisible By Last Digit Hard
StringDynamic Programming
658 Count Substrings Starting and Ending with Given Character Medium
MathStringCounting
659 Count Substrings That Can Be Rearranged to Contain a String I Medium
Hash TableStringSliding Window
660 Count Substrings That Can Be Rearranged to Contain a String II Hard
Hash TableStringSliding Window
Showing 646-660 of 3911
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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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