Submission #1293171

#	Time	Username	Problem	Language	Result	Execution time	Memory
1293171		dosts	Newspapers (CEOI21_newspapers)	C++20	4 / 100	16 ms	680 KiB

newspapers

#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")
#define int long long
#define pii pair<int,int>
#define vi vector<int>
#define ff first
#define ss second
#define sp << " " <<
#define all(x) x.begin(),x.end()
#define big(x) ((int)(x.size()))
using namespace std;
const int MOD = 1e9+7, LIM = 1e6+1, inf = 2e18;

const int N = 1e3+1;
vi edges[N],h(N);

bool dfs(int node,int p) {
    h[node] = 0;
    for (auto it : edges[node]) {
        if (it == p) continue;
        dfs(it,node);
        h[node] = max(h[node],h[it]+1);
    }
    int ctr = 0;
    for (auto it : edges[node]) {
        if (it == p) continue;
        if (h[it]) ctr++;
    }
    return ctr < 3;
}

void solve() {
    int n,m;
    cin >> n >> m;
    for (int i=1;i<=m;i++) {
        int a,b;
        cin >> a >> b;
        edges[a].push_back(b);
        edges[b].push_back(a);
    }
    if (m >= n) {
        cout << "NO\n";
        return;
    }
    int fl = 1;
    for (int i=1;i<=n;i++) {
        fl&=dfs(i,i);
    }
    if (fl) {
        cout << "YES\n";
        cout << "1\n1\n";
        return;
    }
    else cout << "NO\n";
} 

signed main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    int t = 1;
    //cin >> t;
    while (t --> 0) solve();
}

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