#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
ll ttt;
const ll INF=1e18;
const ll MOD=1e9+7;
const ll N=3e5+7;
ll n,m,k;
vector<int>g[N];
ll sz[N];
void dfs(int v, int par=-1){
sz[v]=1;
for(int to:g[v]){
if(to!=par){
dfs(to,v);
sz[v]+=sz[to];
}
}
}
void calc_ans(int c, int v, ll& ans, int par=-1){
ll sum=0;
for(int to:g[v]){
if(to!=par){
calc_ans(c,to,ans,v);
ans+=sz[to]*(c-sz[to]-1);
sum+=sz[to];
}
}
ans+=sum*(c-sum-1);
}
int main() {
cin>>n>>m;
assert(m==n-1);
for(int i=0;i<m;i++){
int x,y;
cin>>x>>y;
g[x].push_back(y);
g[y].push_back(x);
}
ll ans=0;
for(int v=1;v<=n;v++){
if(sz[v]==0){
dfs(v);
calc_ans(sz[v],v,ans);
}
}
cout<<ans<<endl;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
9 ms |
14676 KB |
Execution killed with signal 6 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
9 ms |
14676 KB |
Execution killed with signal 6 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
8 ms |
14676 KB |
Execution killed with signal 6 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
4 ms |
7380 KB |
Output is correct |
2 |
Correct |
5 ms |
7312 KB |
Output is correct |
3 |
Correct |
3 ms |
7380 KB |
Output is correct |
4 |
Correct |
4 ms |
7380 KB |
Output is correct |
5 |
Correct |
4 ms |
7380 KB |
Output is correct |
6 |
Correct |
3 ms |
7380 KB |
Output is correct |
7 |
Correct |
3 ms |
7380 KB |
Output is correct |
8 |
Correct |
4 ms |
7380 KB |
Output is correct |
9 |
Correct |
6 ms |
7380 KB |
Output is correct |
10 |
Runtime error |
9 ms |
14652 KB |
Execution killed with signal 6 |
11 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
69 ms |
11352 KB |
Output is correct |
2 |
Correct |
66 ms |
11348 KB |
Output is correct |
3 |
Correct |
93 ms |
11340 KB |
Output is correct |
4 |
Correct |
87 ms |
11332 KB |
Output is correct |
5 |
Correct |
80 ms |
11304 KB |
Output is correct |
6 |
Correct |
102 ms |
16348 KB |
Output is correct |
7 |
Correct |
78 ms |
14632 KB |
Output is correct |
8 |
Correct |
71 ms |
13788 KB |
Output is correct |
9 |
Correct |
74 ms |
12836 KB |
Output is correct |
10 |
Runtime error |
8 ms |
14740 KB |
Execution killed with signal 6 |
11 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
3 ms |
7380 KB |
Output is correct |
2 |
Correct |
3 ms |
7380 KB |
Output is correct |
3 |
Runtime error |
9 ms |
14676 KB |
Execution killed with signal 6 |
4 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
66 ms |
11268 KB |
Output is correct |
2 |
Correct |
64 ms |
11244 KB |
Output is correct |
3 |
Runtime error |
9 ms |
14676 KB |
Execution killed with signal 6 |
4 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
9 ms |
14676 KB |
Execution killed with signal 6 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
9 ms |
14676 KB |
Execution killed with signal 6 |
2 |
Halted |
0 ms |
0 KB |
- |