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本题是处理边权：val[u]++,val[v]++,val[lca(u,v)]-=2如果处理点权的话，则是：val[u]++,val[v]++,val[lca(u,v)]--,val[fa[lca(u,v)]]--#include<cstdio>#include<iostream>#include<vector>using namespace s...