제출 #516852

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
516852		shmad	철인 이종 경기 (APIO18_duathlon)	C++17	0 / 100	3 ms	588 KiB

count_triplets

#pragma GCC optimize("O3", "unroll-loops")
#pragma GCC target("avx2", "bmi", "bmi2", "lzcnt", "popcnt") 

#include <bits/stdc++.h>

#define int long long
#define vt vector
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
#define ff first
#define ss second
#define dbg(x) cerr << #x << " = " << x << '\n'

using namespace std;
using ll = long long;
using pii = pair<int, int>;
using vvi = vt< vt<int> >;

const int N = 1e6 + 5, mod = 1e9 + 7, inf = 1e18 + 7, B = 500, LIM = (1ll << 60);
const double eps = 1e-6;

vt<int> g[100], used(100);
bool ok;

void dfs (int v, int s, int c, int f, bool check = 0) {
	used[v] = 1;
	if (v == f) {
		ok |= check;
		return;
	}
	if (v == c) check = 1;
	for (auto to: g[v]) {
		if (!used[to]) {
			if (to == f && !check) continue;
			dfs(to, s, c, f, check);
			used[to] = 0;
		}
	}
}

void solve () {
	int n, m;
	cin >> n >> m;
	for (int i = 1; i <= m; i++) {
		int x, y;
		cin >> x >> y;
		g[x].pb(y);
		g[y].pb(x);
	}
	int ans = 0;
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= n; j++) {
			for (int k = 1; k <= n; k++) {
				if (i == j || i == k || j == k) continue;
				ok = 0;
				fill(all(used), 0);
				dfs(i, i, j, k);
				if (ok) ans++;
			}
		}
	}
	cout << ans;
	cout << '\n';
}

bool testcases = 0;
                  
signed main() {
#ifndef ONLINE_JUDGE
	freopen(".in", "r", stdin);
	freopen(".out", "w", stdout);
#endif
    cin.tie(0) -> sync_with_stdio(0);
    int test = 1;
    if (testcases) cin >> test;
    for (int cs = 1; cs <= test; cs++) {
        solve();
    }
}

컴파일 시 표준 에러 (stderr) 메시지

count_triplets.cpp: In function 'int main()':
count_triplets.cpp:71:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |  freopen(".in", "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~
count_triplets.cpp:72:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |  freopen(".out", "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

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