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
121 Minimum Adjacent Swaps for K Consecutive Ones Hard
ArrayGreedySliding Window
122 Minimum Amount of Time to Collect Garbage Medium
ArrayStringPrefix Sum
123 Minimum Array Changes to Make Differences Equal Medium
ArrayHash TablePrefix Sum
124 Minimum Average Difference Medium
ArrayPrefix Sum
125 Minimum Cost to Divide Array Into Subarrays Hard
ArrayDynamic ProgrammingPrefix Sum
126 Minimum Cost to Make Array Equal Hard
ArrayBinary SearchGreedy
127 Minimum Cost to Merge Stones Hard
ArrayDynamic ProgrammingPrefix Sum
128 Minimum Levels to Gain More Points Medium
ArrayPrefix Sum
129 Minimum Moves to Make Array Complementary Medium
ArrayHash TablePrefix Sum
130 Minimum Moves to Pick K Ones Hard
ArrayGreedySliding Window
131 Minimum Number of K Consecutive Bit Flips Hard
ArrayBit ManipulationQueue
132 Minimum Number of Operations to Move All Balls to Each Box Medium
ArrayStringPrefix Sum
133 Minimum Operations to Make All Array Elements Equal Medium
ArrayBinary SearchSorting
134 Minimum Operations to Make Binary Array Elements Equal to One I Medium
ArrayBit ManipulationQueue
135 Minimum Operations to Reduce X to Zero Medium
ArrayHash TableBinary Search
Showing 121-135 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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