#include <bits/stdc++.h>
#define int long long
using namespace std;
signed main(){
ios_base::sync_with_stdio(0);
cin.tie(nullptr);
int n,m;
cin>>n>>m;
set<int> in[n+1],out[n+1];
vector<int> pr(n+1),sz(n+1,1); for(int i=1;i<=n;i++) pr[i]=i;
auto find=[&](int a){
while(a!=pr[a]){
pr[a]=pr[pr[a]];
a=pr[a];
}
return a;
};
int answer=0;
while(m--){
int a,b;
cin>>a>>b;
a=find(a),b=find(b);
if(out[b].find(a)==out[b].end()){
out[a].insert(b);
answer-=in[b].size()*sz[b];
in[b].insert(a);
answer+=in[b].size()*sz[b];
}
else{
answer-=in[b].size()*sz[b];
answer-=in[a].size()*sz[a];
if(sz[a]<sz[b]) swap(a,b);
answer+=sz[a]*sz[b]*2;
pr[b]=a;
sz[a]+=sz[b];
for(int x : in[b]){
if(x!=a){
in[a].insert(x);
out[x].erase(b);
out[x].insert(a);
}
else{
out[a].erase(b);
}
}
for(int x:out[b]){
if(x!=a){
out[a].insert(x);
in[x].erase(b);
in[x].insert(a);
}
else{
in[a].erase(b);
}
}
out[b].clear();
in[b].clear();
answer+=in[a].size()*sz[a];
}
cout<<answer<<'\n';
}
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
212 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
212 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
212 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
