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题目链接：https://vjudge.net/contest/244053#problem/J Labyrinth The northern part of the Pyramid contains a very large and complicated labyrinth. The labyrinth is divided into square blocks, each of them...

题目链接：https://vjudge.net/contest/244053#problem/F Roads in the North   Building and maintaining roads among communities in the far North is an expensive business. With this in mind, the roads are bu...

题目链接：https://codeforces.com/contest/1037/problem/D D. Valid BFS? time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output The BFS algorit...