#include <bits/stdc++.h>
using namespace std;
typedef int ll;
const ll Size=5e3+2;
vector<ll> adj[Size];
pair<ll,ll> dist[Size][Size];
void bfs(ll start_node){
vector<bool> visited(Size,0);
queue<ll> to_process;
to_process.push(start_node);
dist[start_node][start_node]={0,1};
while(!to_process.empty()){
ll curr_node=to_process.front();
to_process.pop();
for(auto itr:adj[curr_node]){
if(visited[itr]==false){
dist[start_node][itr]=dist[start_node][curr_node];
dist[start_node][itr].first++;
visited[itr]=true;
to_process.push(itr);
continue;
}
if(dist[start_node][itr].first>dist[start_node][curr_node].first){
dist[start_node][itr].second+=dist[start_node][curr_node].second;
}
}
}
}
void solve(){
ll n;
pair<ll,ll> ans={0,0};
cin>>n;
for(ll i=0;i<n;i++){
ll from,to;
cin>>from>>to;
adj[from].push_back(to);
adj[to].push_back(from);
}
for(ll i=1;i<=n;i++){
bfs(i);
for(ll j=1;j<=n;j++){
if(dist[i][j].first>ans.first){
ans=dist[i][j];
}else{
if(dist[i][j].first==ans.first){
ans.second+=dist[i][j].second;
}
}
}
}
cout<<ans.second/2<<endl;
}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
ll t=1;
while(t--){
solve();
}
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
0 ms |
332 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
13 ms |
7016 KB |
Output is correct |
2 |
Incorrect |
10 ms |
8652 KB |
Output isn't correct |
3 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Runtime error |
4 ms |
716 KB |
Execution killed with signal 11 |
2 |
Halted |
0 ms |
0 KB |
- |