NeetCode #163LC-308MediumArrays & Hashing
← Back to All Problems#163 · #308 · Range Sum Query 2D - Mutable(二维区域和检索 - 可变)
📌 Problem Statement & Constraints
Design a class supporting
update(row, col, val) and sumRegion(row1, col1, row2, col2) on a 2D matrix. Constraints: 1 <= m, n <= 200; up to 10^4 calls.🔒
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