#include <bits/stdc++.h>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <iostream>
#define MAXN 500001
using namespace std;
vector <int> synowie[MAXN];
vector <int> galezie[MAXN];
int ojciec[MAXN];
bitset <MAXN> odw;
bitset <MAXN> strajk;
void dfs(int x)
{
odw[x] = true;
for(int i = 0; i < galezie[x].size(); i++)
if(galezie[x][i] != ojciec[x]) synowie[x].push_back(galezie[x][i]);
for(int i = 0; i < (int) synowie[x].size(); i++)
if(!odw[synowie[x][i]])
{
ojciec[synowie[x][i]] = x;
dfs(synowie[x][i]);
}
}
int main()
{
int n, x, y, m, pomoc_strajki;
int wynik = 1;
scanf("%d",&n);
for(int i = 1; i < n; i++)
{
scanf("%d%d",&x,&y);
galezie[x].push_back(y);
galezie[y].push_back(x);
}
dfs(1);
scanf("%d",&m);
for(int i = 0; i < m; i++)
{
scanf("%d",&pomoc_strajki);
if(pomoc_strajki > 0) strajk[pomoc_strajki].flip();
else strajk[pomoc_strajki * -1].flip();
if(pomoc_strajki > 0)
{
if(!strajk[ojciec[pomoc_strajki]]) wynik++;
for(int j = 0; j < synowie[ojciec[pomoc_strajki]].size(); j++)
if(synowie[ojciec[pomoc_strajki]][j] == pomoc_strajki)
synowie[ojciec[pomoc_strajki]].erase(synowie[ojciec[pomoc_strajki]].begin()+j);
wynik += synowie[pomoc_strajki].size();
wynik--;
}
if(pomoc_strajki < 0)
{
if(!strajk[ojciec[-1 * pomoc_strajki]]) wynik--;
synowie[ojciec[-1 * pomoc_strajki]].push_back(-1 * pomoc_strajki);
wynik -= synowie[-1 * pomoc_strajki].size();
wynik++;
}
printf("%d\n",wynik);
}
}
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