Codeforces1287 A/B/C/D題解

題源： A:https://vjudge.net/problem/CodeForces-1287A B:https://vjudge.net/problem/CodeForces-1287B C:https://vjudge.net/problem/CodeForces-1287C D:https://vjudge.net/problem/CodeForces-1287Dnode A - Angr

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