Bobby0505 @ 2024-04-20 22:05:24
#include<bits/stdc++.h>
using namespace std;
vector < vector<int> >a;
int n,m,q,fa[400005],des[400005],v[400005],ans,pr[400005],tot;
int find(int x){
return fa[x]==x?x:fa[x]=find(fa[x]);
}
int main(){
cin>>n>>m;
a.resize(n+4);
for(int i=1;i<=m;i++){
int x,y;
cin>>x>>y;
a[x].push_back(y);
a[y].push_back(x);
}
for(int i=0;i<n;i++){
fa[i]=i;
}
cin>>q;
for(int i=1;i<=q;i++){
cin>>des[i];
v[des[i]]=1;
}
ans=n-q;
for(int i=0;i<n;i++){
if(!v[i]){
for(auto j:a[i]){
if(!v[j]){
if(find(i)!=find(j)){
ans--;
fa[find(i)]=find(j);
}
}
}
}
}
tot=tot+1;
pr[tot]=ans;
for(int i=q;i;--i){
v[des[i]]=0;
for(auto j:a[des[i]]){
if(!v[i]){
if(find(des[i])!=find(j)){
ans--;
fa[find(des[i])]=find(j);
}
}
}
tot=tot+1;
pr[tot]=ans;
}
for(int i=tot;i;i--){
cout<<pr[i]<<endl;
}
return 0;
}
by yu1128 @ 2024-04-21 18:26:48
同求
by a1111a @ 2024-04-21 19:15:29
太多问题了,说不过来
by a1111a @ 2024-04-21 19:17:25
by a1111a @ 2024-04-21 19:19:19
by a1111a @ 2024-04-21 19:32:02
然后我就不说了
by yu1128 @ 2024-04-21 21:07:42
@a1111a 别bb。
@Bobby0505 只需要把第二个循环改为
for(int j=0;j<a[des[i]].size();j++){
if(!v[a[des[i]][j]]){
if(find(des[i])!=find(a[des[i]][j]))ans--,fa[find(des[i])]=find(a[des[i]][j]);
}
}
by Bobby0505 @ 2024-04-24 21:22:26
thank you