제출 #1248741

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1248741		anha3k25cvp	Ronald (COCI17_ronald)	C++20	120 / 120	20 ms	3652 KiB

ronald

#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define dl double
#define st first
#define nd second
#define II pair <int, int>

using namespace std;

const int N = 1 + 1e3;
const int inf = 7 + 1e9;

int n, m, siz = 0;
vector <int> vis;
vector <vector <int>> adj;
stack <int> s;

void dfs(int u) {
    vis[u] = 1;
    s.push(u);
    siz ++;
    for (int v : adj[u])
        if (!vis[v])
            dfs(v);
}

int main() {
#define TASKNAME ""
    ios_base :: sync_with_stdio (0);
    cin.tie (0);
    if ( fopen( TASKNAME".inp", "r" ) ) {
        freopen (TASKNAME".inp", "r", stdin);
        freopen (TASKNAME".out", "w", stdout);
    }
    cin >> n >> m;
    adj.resize(n + 1);
    for (int i = 1; i <= m; i ++) {
        int u, v;
        cin >> u >> v;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    vis.assign(n + 1, 0);
    int cnt = 0;
    for (int i = 1; i <= n; i ++)
        if (!vis[i]) {
            if (cnt > 1) {
                cout << "NE";
                return 0;
            }
            cnt ++;
            siz = 0;
            dfs(i);
            while (!s.empty()) {
                int u = s.top();
                if (siz - 1 != adj[u].size()) {
                    cout << "NE";
                    return 0;
                }
                s.pop();
            }
        }
    cout << "DA";
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

ronald.cpp: In function 'int main()':
ronald.cpp:33:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |         freopen (TASKNAME".inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
ronald.cpp:34:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |         freopen (TASKNAME".out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 15 / 15
• Subtask 3: 15 / 15
• Subtask 4: 15 / 15
• Subtask 5: 15 / 15
• Subtask 6: 15 / 15
• Subtask 7: 15 / 15
• Subtask 8: 15 / 15