// I_Love_LPL
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define endl '\n'
const int N = 1e5 + 5;
const int lg = 60;
const int mod = 998244353;
const long long oo = 1e18;
const int lim = 1e6 + 5;
long double eps = 1e-3;
vector<ll> node[N];
ll dpc[N], dpd[N], color[N];
void initialize(ll n, vector<ll> A, vector<ll> B){
for (int i = 1; i < n; i++){
node[A[i - 1]].push_back(B[i - 1]);
node[B[i - 1]].push_back(A[i - 1]);
}
}
void dfs(ll u, ll p){
dpc[u] = 0;
dpd[u] = 0;
if (color[u] == 1) dpd[u] = 1e9;
if (color[u] == 2) dpc[u] = 1e9;
for (auto j : node[u]){
if (j == p) continue;
dfs(j, u);
if (color[u] == 1) dpc[u] += min(dpc[j], dpd[j] + 1);
else if (color[u] == 2) dpd[u] += min(dpd[j], dpc[j] + 1);
else dpc[u] += min(dpc[j], dpd[j] + 1), dpd[u] += min(dpd[j], dpc[j] + 1);
}
}
ll Solve(){
dfs(1, 1);
return min(dpc[1], dpd[1]);
}
ll cat(ll v){
color[v] = 1;
return Solve();
}
ll dog(ll v){
color[v] = 2;
return Solve();
}
ll neighbor(ll v){
color[v] = 0;
return Solve();
}
/*
int main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
if (fopen("A.inp", "r")){
freopen("test.inp", "r", stdin);
freopen("test.out", "w", stdout);
}
ll n;
cin >> n;
vector<ll> A, B;
for (int i = 1; i < n; i++){
ll u, v;
cin >> u >> v;
A.push_back(u);
B.push_back(v);
}
initialize(n, A, B);
ll q;
cin >> q;
while (q--){
ll task;
cin >> task;
if (task == 0){
ll u;
cin >> u;
cout << neighbor(u) << endl;
} else if (task == 1){
ll u;
cin >> u;
cout << cat(u) << endl;
} else {
ll u;
cin >> u;
cout << dog(u) << endl;
}
}
}
/*
5
1 2
2 3
2 4
4 5
5
1 3
2 5
1 2
2 1
0 2
*/
Compilation message
catdog.cpp:87:1: warning: "/*" within comment [-Wcomment]
87 | /*
|
/tmp/ccCR0Oy1.o: In function `main':
grader.cpp:(.text.startup+0x15b): undefined reference to `initialize(int, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)'
grader.cpp:(.text.startup+0x1a9): undefined reference to `neighbor(int)'
grader.cpp:(.text.startup+0x1ea): undefined reference to `dog(int)'
grader.cpp:(.text.startup+0x2b1): undefined reference to `cat(int)'
collect2: error: ld returned 1 exit status
