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
601 Count Square Submatrices with All Ones Medium
ArrayDynamic ProgrammingMatrix
602 Count Square Sum Triples Easy
MathEnumeration
603 Count Stepping Numbers in Range Hard
StringDynamic Programming
604 Count Strictly Increasing Subarrays Medium
ArrayMathDynamic Programming
605 Count Student Number in Departments Medium
Database
606 Count Sub Islands Medium
ArrayDepth-First SearchBreadth-First Search
607 Count Subarrays of Length Three With a Condition Easy
Array
608 Count Subarrays Where Max Element Appears at Least K Times Medium
ArraySliding Window
609 Count Subarrays With Fixed Bounds Hard
ArrayQueueSliding Window
610 Count Subarrays With Median K Hard
ArrayHash TablePrefix Sum
611 Count Subarrays With More Ones Than Zeros Medium
ArrayHash TableBinary Search
612 Count Subarrays With Score Less Than K Hard
ArrayBinary SearchSliding Window
613 Count Submatrices With All Ones Medium
ArrayDynamic ProgrammingStack
614 Count Submatrices With Equal Frequency of X and Y Medium
ArrayMatrixPrefix Sum
615 Count Submatrices with Top-Left Element and Sum Less Than k Medium
ArrayMatrixPrefix Sum
Showing 601-615 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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