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The French author Georges Perec (1936–1982) once wrote a book, La disparition, without the letter 'e'. He was a member of the Oulipo group. A quote fr 阅读全文
posted @ 2018-06-09 19:49
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There are n distinct points in the plane, given by their integer coordinates. Find the number of parallelograms whose vertices lie on these points. In 阅读全文
posted @ 2018-06-09 15:28
Fitz~
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链接：https://www.nowcoder.com/acm/contest/114/B来源：牛客网 题目描述 Ans = 0; For(inti = 1; i <= n; i++) For(int v = 0; v <= n; v++) Ans = (Ans + C(i, v) * C(i, v 阅读全文
posted @ 2018-06-09 13:16
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