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只能说将近一年没打建图都不会建了.......就是只有偶数个，并且当前节点的所有子节点加自身正好是n/2时，才会出现这样的情况。思路一眼就出了，但是忘了需要按照无向图建图，我给默认有向建了个图....wa的自闭手速也明显不如以前了#include<iostream>#include<cstdio>#include<vector>using namespace std;vector<int>v[200000];int ins[2000

D. Divide by three, multiply by twotime limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputPolycarp likes to play with numbers. He takes some integer numbe...

E. Two Arrays and Sum of Functionstime limit per test2 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputYou are given two arrays aand b, both of len...