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Leetcode 378. Kth Smallest Element in a Sorted Matrix
Given an n×n matrix whose rows and columns are sorted in non-decreasing order, return the k-th smallest element (counting duplicates). The core challenge is to exploit the matrix's monotonic structure to avoid O(n^2) space/time — common efficient approaches use a size‑n heap or binary search on values with row-wise counting.
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Early July, 2025
Meta
Staff
Late January, 2025
Amazon
Junior
Find row with max 1's in a row-wise sorted matrix (m, n = 100,000)
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