제출 #1203271

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1203271		saidpon	철인 이종 경기 (APIO18_duathlon)	C++20	0 / 100	30 ms	13636 KiB

count_triplets

#include <bits/stdc++.h>
#define nemeshay ios_base::sync_with_stdio(NULL), cin.tie(0), cout.tie(0);
#define int long long
#define sigma signed
#define pb push_back
#define ar array
using namespace std;
const int N = 2e5 + 2, inf = 1e9 + 7, mod = 998244353;
int used[N], ans;
vector <int> pon[N];
void dfs(int u, int cnt){
    used[u] = 1;
    for (auto v: pon[u]) if (!used[v]) ans += cnt * (cnt - 1), dfs(v, cnt + 1);
}
void test_case(){
    int n, m;
    cin >> n >> m;
    for (int i = 0; i < m; i++){
        int u, v;
        cin >> u >> v;
        pon[u].pb(v);
        pon[v].pb(u);
    }
    for (int i = 1; i <= n; i++) if (!used[i]) dfs(i, 1);
    cout << ans << '\n';
}
sigma main() {
    nemeshay
    int t = 1;
    while (t--) test_case();
}

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