POJ 1681 Painter's Problem 笔记
2017-05-31 21:00
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n*n的格子有的是黄色有的是白色。有把神奇的刷子,刷子放到 (i, j)上, (i, j), (i-1, j), (i+1, j), (i, j-1) 和 (i, j+1) 都会改变颜色。判断能否都刷成黄色,如果能给出刷格子的最小数量。
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