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Update 如何选择现在吃什么.md
提供解析解
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* b >= a
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* b >= a
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* b <= a + 1
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* b <= a + 1
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得到一组关于`a`, `b`的整数解即可。
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解得
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* a = floor(N/2)
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* b = ceil(N/2)
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### 菜的选择
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### 菜的选择
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