Educational Codeforces Round 74 (Rated for Div. 2) D. AB-string(逆向思维)
题目链接https://codeforces.com/contest/1238/problem/D题
Codeforces Round #339 (Div. 1) A. Peter and Snow Blower(点到线段距离)
题目链接https://codeforces.com/contest/613/problem/A思路
Educational Codeforces Round 46 (Rated for Div. 2) E.We Need More Bosses(双连通分量+缩点)
题目链接https://codeforces.com/contest/1000/problem/E题
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