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这么变态我为了避免浮点误差把if (dx == 0 || dy == 0 || dx == dy) 写成if (dx < EPS || dy < EPS || abs(dx - dy) < EPS) 居然WA了（其中EPS ＝ 1e－10） 结果改成第一种就对了 Followed by:
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