제출 #685049

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
685049		moonhero	Newspapers (CEOI21_newspapers)	C++14	4 / 100	1 ms	352 KiB

newspapers

#include<bits/stdc++.h>
using namespace std;
using ll = long long;

vector <int> g[1005];
bool used[1005], ok = 1;
int ln[1005], mx = 0;

void dfs (int v, int pr = 0) {
    used[v] = 1, ln[v] = ln[pr] + 1;
    mx = max(mx, ln[v]);
    for (auto it : g[v]) {
        if (!used[it]) dfs(it, v);
    }
}

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n, m; cin >> n >> m;
    ln[0] = 0;
    for (int i = 1; i <= m; i++) {
        int u, v; cin >> u >> v;
        g[u].push_back(v);
        g[v].push_back(u);
    } if (m != n - 1) {
        cout << "NO\n";
        return 0;
    } dfs(1);
    if (mx >= 2 || n == 1) {
        cout << "YES\n1\n1";
        return 0;
    } else cout << "NO\n";
    return 0;
}

• Subtask 1: 0 / 12
• Subtask 2: 4 / 8
• Subtask 3: 0 / 80