水并查集
时光倒流就可以了
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<vector>
#include<algorithm>
using namespace std;
int f[400005],n,m,k,del[400005],cnt,star[400005],ans[400005];
vector<int> V[400005];
int Find(int x){return x==f[x]?x:f[x]=Find(f[x]);}
void Union(int x,int y){f[x]=y;}
int main(){
scanf("%d %d",&n,&m);
for(int i=1;i<=m;i++){int x,y;scanf("%d %d",&x,&y);x++;y++;V[x].push_back(y);V[y].push_back(x);}
scanf("%d",&k);
cnt=n-k;
for(int i=1;i<=k;i++){
scanf("%d",&star[i]);
del[++star[i]]=1;
}
for(int i=1;i<=n;i++)f[i]=i;
for(int i=1;i<=n;i++){
if(del[i])continue;
for(int j=0;j<V[i].size();j++){
if(!del[V[i][j]] && Find(i)!=Find(V[i][j])){cnt--;Union(Find(i),Find(V[i][j]));}
}
}
ans[k+1]=cnt;
for(int i=k;i;i--){
cnt++;del[star[i]]=0;
for(int j=0;j<V[star[i]].size();j++){if(!del[V[star[i]][j]] && Find(V[star[i]][j])!=Find(star[i]))cnt--,Union(Find(star[i]),Find(V[star[i]][j]));}
ans[i]=cnt;
}
for(int i=1;i<=k+1;i++)printf("%d\n",ans[i]);
return 0;
}
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