Prefix Sum Coding Problems

Cumulative sum techniques for range queries

208
Total Problems
18
Easy
128
Medium
61
Hard
Start Practicing
13610Σ prefix sums

Master DSA Topics - January, 2026

Practice problems across 75+ categories

Prefix Sum Coding Problems

Practice problems frequently asked at Prefix Sum 208 problems | 18 Easy | 128 Medium | 61 Hard

# Problem Difficulty Topics
46 Find Longest Self-Contained Substring Hard
Hash TableStringBinary Search
47 Find Pivot Index Easy
ArrayPrefix Sum
48 Find Polygon With the Largest Perimeter Medium
ArrayGreedySorting
49 Find the Count of Monotonic Pairs I Hard
ArrayMathDynamic Programming
50 Find the Count of Monotonic Pairs II Hard
ArrayMathDynamic Programming
51 Find the Highest Altitude Easy
ArrayPrefix Sum
52 Find the Longest Substring Containing Vowels in Even Counts Medium
Hash TableStringBit Manipulation
53 Find the Middle Index in Array Easy
ArrayPrefix Sum
54 Find the Minimum Amount of Time to Brew Potions Medium
ArraySimulationPrefix Sum
55 Find the N-th Value After K Seconds Medium
ArrayMathSimulation
56 Find the Original Typed String II Hard
StringDynamic ProgrammingPrefix Sum
57 Find the Pivot Integer Easy
MathPrefix Sum
58 Find the Score of All Prefixes of an Array Medium
ArrayPrefix Sum
59 Find the Student that Will Replace the Chalk Medium
ArrayBinary SearchSimulation
60 Frequency of the Most Frequent Element Medium
ArrayBinary SearchGreedy
Showing 46-60 of 208
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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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