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Given a binary m×n matrix, determine the maximum number of rows that can be made all-equal (all 0s or all 1s) by flipping any subset of columns — rows that are identical or exact complements are equivalent under column flips, so the answer is the size of the largest group of rows matching up to bitwise complement.
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Leetcode 1072. Flip Columns For Maximum Number of Equal Rows
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Source snapshot: Nov 12, 2026
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