摘要:
用向量解决: 三角形面积:S=1/2*|x1*y2-x2*y1|; (粗体表示向量) 三棱锥体积:V=1/6*(OA*OB)*OC 不知道哪里去找的代码,毕竟很线性代数矩阵什么的很头疼,晚上再手动比划下。 阅读全文
posted @ 2017-10-09 14:08
nimphy
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摘要:
It is well known that AekdyCoin is good at string problems as well as number theory problems. When given a string s, we can write down all the non-emp 阅读全文
posted @ 2017-10-09 12:23
nimphy
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