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F. st Spanning Tree 题目连接： http://codeforces.com/contest/723/problem/F Description You are given an undirected connected graph consisting of n vertices 阅读全文
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E. One Way Reform 题目连接： http://codeforces.com/contest/723/problem/E Description There are n cities and m two way roads in Berland, each road connects 阅读全文
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D. Lakes in Berland 题目连接： http://codeforces.com/contest/723/problem/D Description The map of Berland is a rectangle of the size n × m, which consists 阅读全文
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C. Polycarp at the Radio 题目连接： http://codeforces.com/contest/723/problem/C Description Polycarp is a music editor at the radio station. He received a 阅读全文
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B. Text Document Analysis 题目连接： http://codeforces.com/contest/723/problem/B Description Modern text editors usually show some information regarding th 阅读全文
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A. The New Year: Meeting Friends 题目连接： http://codeforces.com/contest/723/problem/A Description There are three friend living on the straight line Ox i 阅读全文