| 🟢 Easy | 303. Range Sum Query - Immutable | Cumulative Sum |
| 🟢 Easy | 724. Find Pivot Index | Prefix Sum |
| 🟡 Medium | 560. Subarray Sum Equals K | Prefix Sum with HashMap |
| 🟡 Medium | 238. Product of Array Except Self | Prefix Product |
| 🟡 Medium | 930. Binary Subarrays With Sum | Prefix Sum + HashMap |
| 🟡 Medium | 1524. Number of Subarrays With Odd Sum | Prefix Sum + Modulo |
| 🟡 Medium | 2090. K Radius Subarray Averages | Prefix Sum + Sliding Window |
| 🟡 Medium | 1074. Number of Submatrices That Sum to Target | 2D Prefix Sum + HashMap |
| 🟡 Medium | 304. Range Sum Query 2D - Immutable | 2D Cumulative Sum |
| 🔴 Hard | 327. Count of Range Sum | Prefix Sum + Binary Search |
| 🔴 Hard | 1171. Remove Zero Sum Consecutive Nodes from Linked List | Prefix Sum + HashMap |
| 🔴 Hard | 1685. Sum of Absolute Differences in a Sorted Array | Prefix Sum |
| 🔴 Hard | 363. Max Sum of Rectangle No Larger Than K | 2D Prefix Sum + Binary Search |