#include <bits/stdc++.h> #define int long long using namespace std; const int N=100010, INF=1e9; int n, q, a[N], d1[N], d2[N]; vector<int> adj[N]; void dfs(int curr, int prev) { d1[curr]=d2[curr]=0; for(int next:adj[curr]) if(next!=prev) { dfs(next, curr); d1[curr]+=min(d1[next], d2[next]+1), d2[curr]+=min(d2[next], d1[curr]+1); } if(a[curr]==1) d2[curr]=INF; if(a[curr]==2) d1[curr]=INF; } signed main() { ios_base::sync_with_stdio(0); cin.tie(0); cin>>n; for(int i=1; i<n; i++) { int u, v; cin>>u>>v; adj[u].push_back(v), adj[v].push_back(u); } cin>>q; while(q--) { int o, k; cin>>o>>k; a[k]=o%3; dfs(1, 0); cout<<min(d1[1], d2[1])<<"\n"; } return 0; }

/usr/bin/ld: /tmp/ccP3AabN.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccSBcQ5M.o:catdog.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccP3AabN.o: in function `main':
grader.cpp:(.text.startup+0x1e2): undefined reference to `initialize(int, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)'
/usr/bin/ld: grader.cpp:(.text.startup+0x219): undefined reference to `neighbor(int)'
/usr/bin/ld: grader.cpp:(.text.startup+0x25e): undefined reference to `dog(int)'
/usr/bin/ld: grader.cpp:(.text.startup+0x269): undefined reference to `cat(int)'
collect2: error: ld returned 1 exit status