#include<cstdio>
#include<vector>
std::vector<int> a[111111];
int p[111111];
int q[111111];
int par(int x){return x==p[x]?x:p[x]=par(p[x]);}
void com(int x,int y){x=par(x);y=par(y);p[x]=y;q[y]+=q[x];}
int main()
{
long long res;
int i,j,n,m;
scanf("%d%d",&n,&m);
while(m--)
{
scanf("%d%d",&i,&j);
a[i].push_back(j);
}
for(i=1;i<=n;i++)
{
p[i]=i;
q[i]=1;
}
for(i=1;i<=n;i++)for(j=1;j<a[i].size();j++)com(a[i][j],a[i][0]);
res=0;
for(i=1;i<=n;i++)
{
if(i==p[i])res+=1LL*q[i]*(q[i]-1);
for(j=0;j<a[i].size();j++)if(par(i)!=par(a[i][j]))res++;
}
printf("%lld\n",res);
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
4680 KB |
Output is correct |
2 |
Correct |
0 ms |
4680 KB |
Output is correct |
3 |
Correct |
0 ms |
4680 KB |
Output is correct |
4 |
Incorrect |
0 ms |
4680 KB |
Output isn't correct |
5 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
0 ms |
4680 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
74 ms |
5736 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |