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本科计算机毕业 4 年，工作 4 年，今天刚学会排列组合，突然对编程发现很有用
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程序员 - @chaogeonly - 不瞒大家说，今天和同学讨论一个问题：低开、高开、低走、高走，一共有多少个排列组合（当时还不明白排列和组合的具体含义），然后我就说是 A22 * 2，同学说不对，而是 A21 * A21，然后我就开始学
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