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其实日期没有那么近啦……只是我偶尔还点进去造成的，导致我没有每一章刷完的纪念日了 但是全刷完是今天啦 讲真，题很锻炼思维能力，USACO保持着一贯猎奇的题目描述，以及尽量不用高级算法就完成的题解……例如用暴搜加优化代替插头dp 但是第6章！我就说第6章！为什么大赛的实践，几乎全是暴搜！是为了传达给我 阅读全文
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Checker Challenge Examine the 6x6 checkerboard below and note that the six checkers are arranged on the board so that one and only one is placed in ea 阅读全文
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Consider nine clocks arranged in a 3x3 array thusly: The goal is to find a minimal sequence of moves to return all the dials to 12 o'clock. Nine diffe 阅读全文