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  • Codeforces #513 D

    http://codeforces.com/problemset/problem/1060/D 要開一個(gè)宴會(huì)还绘,可以用若干椅子擺成若干環(huán)悴务。每個(gè)賓客...

  • Codeforces #514 Div2 E. Split the Tree

    http://codeforces.com/problemset/problem/1059/E 給一棵樹爹袁,每個(gè)點(diǎn)有一些點(diǎn)權(quán)比肄。定義垂直路徑為:一條...

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