#include <bits/stdc++.h>
#define PB push_back
using namespace std;
typedef long long ll;
const int N = 100100;
const int M = 200100;
set<int> st;
vector<int> g[N], adj[2 * N];
int n, m, tin[N], fup[N], pr[M], siz_comp[2 * N], siz[2 * N], tt = 0, U[M], V[M];
bool mrk[2 * N];
ll ans = 0ll;
int get(int x){ return (pr[x] == x ? x : pr[x] = get(pr[x])); }
void dfs0(int v, int p_edg){
mrk[v] = 1;
tin[v] = fup[v] = ++tt;
for (int nm : g[v]){
if (nm == p_edg) continue;
int u = (U[nm] == v ? V[nm] : U[nm]);
if (!mrk[u]){
dfs0(u, nm);
if (fup[u] < tin[v]){
if (p_edg >= 0) pr[get(p_edg)] = get(nm);
}
fup[v] = min(fup[v], fup[u]);
} else {
fup[v] = min(fup[v], tin[u]);
if (tin[u] < tin[v])
pr[get(p_edg)] = get(nm);
}
}
}
void dfs(int v, int p){
mrk[v] = 1;
siz[v] = bool(v < n);
for (int u : adj[v])
if (u != p) {
dfs(u, v);
siz[v] += siz[u];
}
}
void finally(int v, int r, int p){
for (int u : adj[v]){
if (u == p) continue;
finally(u, r, v);
}
}
int main(){
ios_base::sync_with_stdio(0); cin.tie(0);
freopen("in.txt","r",stdin);
cin >> n >> m;
for (int i = 0; i < m; i++){
pr[i] = i;
int x, y; cin >> x >> y;
x--; y--;
U[i] = x;
V[i] = y;
g[x].PB(i);
g[y].PB(i);
}
for (int i = 0; i < n; i++)
if (!mrk[i]) dfs0(i, -1);
for (int v = 0; v < n; v++){
st.clear();
for (int nm : g[v])
st.insert(get(nm));
for (auto cp : st){
siz_comp[cp]++;
adj[cp + n].PB(v);
adj[v].PB(cp + n);
}
}
fill(mrk, mrk + n, 0);
for (int v = 0; v < n; v++){
if (mrk[v]) continue;
dfs(v, -1);
ans += ll(siz[v]) * (ll(siz[v]) - 1ll) * (ll(siz[v]) - 2ll);
finally(v, v, -1);
}
cout << ans;
return 0;
}
Compilation message
count_triplets.cpp: In function 'int main()':
count_triplets.cpp:64:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
freopen("in.txt","r",stdin);
~~~~~~~^~~~~~~~~~~~~~~~~~~~
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
11 ms |
7424 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
11 ms |
7424 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
11 ms |
7424 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
10 ms |
7296 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
10 ms |
7296 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
11 ms |
7424 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
10 ms |
7476 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
11 ms |
7424 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
11 ms |
7424 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |