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Given an m×n grid of 'B' and 'W' and an integer N, count black pixels at (i,j) such that row i and column j each contain exactly N black pixels and every row that has a black pixel in column j is identical to row i. The core challenge is grouping identical row patterns and combining those groups with column counts to identify qualifying pixels.
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Leetcode 533. Lonely Pixel II
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Source snapshot: Nov 12, 2026
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