最终得对抗自己
Hineven - May 17, 2018 - No comments
考虑归纳法, 显然1条直线情况下命题是成立的, 那么加入第n条直线时, 会把一些块给切开, 考虑让这条直线左侧的所有块颜色反转, 出现新的合法二染色方案。
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