Hash Table Coding Problems

Understand hashing and key-value operations

719
Total Problems
168
Easy
418
Medium
127
Hard
Start Practicing
key → valkey → val

Master DSA Topics - January, 2026

Practice problems across 75+ categories

Hash Table Coding Problems

Practice problems frequently asked at Hash Table 719 problems | 168 Easy | 418 Medium | 127 Hard

# Problem Difficulty Topics
706 Valid Sudoku Medium
ArrayHash TableMatrix
707 Verifying an Alien Dictionary Easy
ArrayHash TableString
708 Vertical Order Traversal of a Binary Tree Hard
Hash TableTreeDepth-First Search
709 Vowel Spellchecker Medium
ArrayHash TableString
710 Walking Robot Simulation Medium
ArrayHash TableSimulation
711 Widest Pair of Indices With Equal Range Sum Medium
ArrayHash TablePrefix Sum
712 Word Break Medium
ArrayHash TableString
713 Word Break II Hard
ArrayHash TableString
714 Word Ladder Hard
Hash TableStringBreadth-First Search
715 Word Ladder II Hard
Hash TableStringBacktracking
716 Word Pattern Easy
Hash TableString
717 Word Pattern II Medium
Hash TableStringBacktracking
718 Word Subsets Medium
ArrayHash TableString
719 X of a Kind in a Deck of Cards Easy
ArrayHash TableMath
Showing 706-719 of 719
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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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