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round.906专题
codeforces round.906 - E - Mirror Grid (数学,坐标变换)
You are given a square grid with n rows and n columns. Each cell contains either 0 0 0 or 1 1 1. In an operation, you can select a cell of the grid and flip it (from 0 → 1 0→1 0→1 or 1 → 0 1→0 1→
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