#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
class UN{
public:
vector<int>P;
UN(int n){P.resize(n);for(int i=0;i<n;i++)P[i]=i;}
int F(int X){return X==P[X]?X:P[X]=F(P[X]);}
void ch(int X,int Y)
{
if(F(X)!=F(Y))
P[P[X]]=P[Y];
}
};
vector<vector<int> >V;
vector<int>ST,NST,VC;
bitset<100000>IS,ch;
int N,M;
int main()
{
ios::sync_with_stdio(0);
cin.tie(0);
cin>>N>>M;
UN tr(N);
V.resize(N);
VC.resize(N);
for(int i=0;i<M;i++)
{
int T,O;
cin>>T>>O;T--,O--;
V[T].push_back(O);
}
for(int i=0;i<N;i++)ST.push_back(i),ch.set(i);
while(!ST.empty())
{
ch.reset();
for(auto&I:ST)
{
if(IS.test(I))for(auto&J:V[I])
{
tr.ch(J,I);
if(IS.test(J)==0&&ch.test(J)==0)
{
NST.push_back(J);
ch.set(J);
}IS.set(J);
}
else if(V[I].size()>=2)for(auto&J:V[I])
{
tr.ch(J,V[I][0]);
if(IS.test(J)==0&&ch.test(J)==0)
{
NST.push_back(J);
ch.set(J);
}IS.set(J);
}
}
swap(ST,NST);
NST.resize(0);
}
for(int i=0;i<N;i++)VC[tr.F(i)]++;
ll tot=0;
for(int i=0;i<N;i++)if(tr.F(i)==i)tot+=(ll)VC[tr.P[i]]*(VC[tr.P[i]]-1);
for(int i=0;i<N;i++)if(IS.test(i)==0)tot+=V[i].size();
cout<<tot;
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
376 KB |
Output is correct |
| 2 |
Correct |
2 ms |
488 KB |
Output is correct |
| 3 |
Correct |
2 ms |
488 KB |
Output is correct |
| 4 |
Correct |
3 ms |
504 KB |
Output is correct |
| 5 |
Correct |
2 ms |
504 KB |
Output is correct |
| 6 |
Correct |
3 ms |
504 KB |
Output is correct |
| 7 |
Correct |
2 ms |
504 KB |
Output is correct |
| 8 |
Correct |
3 ms |
508 KB |
Output is correct |
| 9 |
Correct |
2 ms |
508 KB |
Output is correct |
| 10 |
Correct |
2 ms |
508 KB |
Output is correct |
| 11 |
Correct |
2 ms |
508 KB |
Output is correct |
| 12 |
Correct |
3 ms |
508 KB |
Output is correct |
| 13 |
Correct |
3 ms |
508 KB |
Output is correct |
| 14 |
Correct |
3 ms |
508 KB |
Output is correct |
| 15 |
Correct |
3 ms |
508 KB |
Output is correct |
| 16 |
Correct |
3 ms |
508 KB |
Output is correct |
| 17 |
Correct |
3 ms |
508 KB |
Output is correct |
| 18 |
Correct |
2 ms |
508 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
748 KB |
Output is correct |
| 2 |
Correct |
4 ms |
756 KB |
Output is correct |
| 3 |
Correct |
10 ms |
1088 KB |
Output is correct |
| 4 |
Correct |
45 ms |
1772 KB |
Output is correct |
| 5 |
Correct |
38 ms |
1772 KB |
Output is correct |
| 6 |
Correct |
69 ms |
2284 KB |
Output is correct |
| 7 |
Correct |
3 ms |
2284 KB |
Output is correct |
| 8 |
Correct |
5 ms |
2284 KB |
Output is correct |
| 9 |
Correct |
9 ms |
2284 KB |
Output is correct |
| 10 |
Correct |
17 ms |
2284 KB |
Output is correct |
| 11 |
Correct |
61 ms |
2284 KB |
Output is correct |
| 12 |
Correct |
9 ms |
2284 KB |
Output is correct |
| 13 |
Correct |
5 ms |
2284 KB |
Output is correct |
| 14 |
Correct |
6 ms |
2284 KB |
Output is correct |
| 15 |
Correct |
8 ms |
2284 KB |
Output is correct |
| 16 |
Correct |
13 ms |
2284 KB |
Output is correct |
| 17 |
Correct |
50 ms |
2284 KB |
Output is correct |
| 18 |
Correct |
4 ms |
2284 KB |
Output is correct |
| 19 |
Correct |
4 ms |
2284 KB |
Output is correct |
| 20 |
Correct |
64 ms |
2300 KB |
Output is correct |
| 21 |
Correct |
5 ms |
2300 KB |
Output is correct |
| 22 |
Correct |
4 ms |
2300 KB |
Output is correct |
| 23 |
Correct |
7 ms |
2300 KB |
Output is correct |
| 24 |
Correct |
4 ms |
2300 KB |
Output is correct |
| 25 |
Correct |
4 ms |
2300 KB |
Output is correct |
| 26 |
Correct |
5 ms |
2300 KB |
Output is correct |
| 27 |
Correct |
5 ms |
2300 KB |
Output is correct |
| 28 |
Correct |
4 ms |
2300 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
51 ms |
2300 KB |
Output is correct |
| 2 |
Correct |
127 ms |
7848 KB |
Output is correct |
| 3 |
Correct |
139 ms |
7848 KB |
Output is correct |
| 4 |
Correct |
71 ms |
7848 KB |
Output is correct |
| 5 |
Correct |
35 ms |
7848 KB |
Output is correct |
| 6 |
Correct |
105 ms |
7848 KB |
Output is correct |
| 7 |
Correct |
83 ms |
7848 KB |
Output is correct |
| 8 |
Correct |
84 ms |
7848 KB |
Output is correct |
| 9 |
Correct |
88 ms |
7848 KB |
Output is correct |
| 10 |
Correct |
75 ms |
7848 KB |
Output is correct |
| 11 |
Correct |
134 ms |
7848 KB |
Output is correct |
| 12 |
Correct |
132 ms |
8052 KB |
Output is correct |
| 13 |
Correct |
48 ms |
8052 KB |
Output is correct |
| 14 |
Correct |
68 ms |
8052 KB |
Output is correct |
| 15 |
Correct |
31 ms |
8052 KB |
Output is correct |
| 16 |
Correct |
8 ms |
8052 KB |
Output is correct |
| 17 |
Correct |
7 ms |
8052 KB |
Output is correct |
| 18 |
Correct |
128 ms |
8052 KB |
Output is correct |
| 19 |
Correct |
143 ms |
8052 KB |
Output is correct |
| 20 |
Correct |
96 ms |
8052 KB |
Output is correct |
| 21 |
Correct |
34 ms |
8052 KB |
Output is correct |
| 22 |
Correct |
7 ms |
8052 KB |
Output is correct |
| 23 |
Correct |
43 ms |
8052 KB |
Output is correct |
| 24 |
Correct |
59 ms |
8052 KB |
Output is correct |
| 25 |
Correct |
44 ms |
8052 KB |
Output is correct |
| 26 |
Correct |
64 ms |
8052 KB |
Output is correct |
| 27 |
Correct |
115 ms |
8076 KB |
Output is correct |
| 28 |
Correct |
60 ms |
8076 KB |
Output is correct |
| 29 |
Correct |
63 ms |
8076 KB |
Output is correct |
| 30 |
Correct |
140 ms |
8076 KB |
Output is correct |
| 31 |
Correct |
52 ms |
8076 KB |
Output is correct |
| 32 |
Correct |
55 ms |
8076 KB |
Output is correct |
| 33 |
Correct |
56 ms |
8076 KB |
Output is correct |
| 34 |
Correct |
61 ms |
8076 KB |
Output is correct |
| 35 |
Correct |
51 ms |
8076 KB |
Output is correct |
| 36 |
Correct |
65 ms |
8076 KB |
Output is correct |
| 37 |
Correct |
58 ms |
8076 KB |
Output is correct |
