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Submission #588493

# Submission time Handle Problem Language Result Execution time Memory
588493 2022-07-03T11:32:57 Z jasmin Newspapers (CEOI21_newspapers) C++14
4 / 100
 1 ms 448 KB 
#include<bits/stdc++.h>
using namespace std;
#define int long long

int bfs(int n, vector<vector<int> >& adi){
    vector<bool> vis(n);
    deque<int> q;
    q.push_back(0);
    int last=0;
    vis[0]=true;
    while(!q.empty()){
        int v=last=q.front();
        q.pop_front();

        for(auto u: adi[v]){
            if(!vis[u]){
                vis[u]=true;
                q.push_back(u);
            }
        }
    }
    return last;
}

int dfs(int v, vector<bool>& vis, vector<vector<int> >& adi, bool& pos){
    if(vis[v]) return 0;
    vis[v]=true;
    int cnt=1;

    int further=0;
    for(auto u: adi[v]){

        int subtree=dfs(u, vis, adi, pos);
        cnt+=subtree;
        if(subtree>1){
            further++;
        }
    }
    pos=pos&&(further<=1);
    return cnt;
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int n, m;
    cin >> n >> m;
    vector<vector<int> > adi(n);
    for(int i=0; i<m; i++){
        int a, b;
        cin >> a >> b;
        adi[a-1].push_back(b-1);
        adi[b-1].push_back(a-1);
    }

    bool pos=(m==n-1);
    int root=bfs(n, adi);
    //cout << root << "\n" << flush;
    vector<bool> vis(n, false);
    dfs(root, vis, adi, pos);

    if(pos){
        cout << "YES\n";
        cout << 1 << "\n";
        cout << 1 << "\n";
    }
    else{
        cout << "NO\n";
    }
}

Subtask #1
0.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Partially correct 1 ms 212 KB Failed to provide a successful strategy.
3 Partially correct 1 ms 212 KB Failed to provide a successful strategy.
4 Partially correct 1 ms 212 KB Failed to provide a successful strategy.
5 Partially correct 1 ms 212 KB Failed to provide a successful strategy.
6 Partially correct 1 ms 212 KB Failed to provide a successful strategy.
7 Correct 0 ms 212 KB Output is correct
8 Incorrect 0 ms 212 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #2
4.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Partially correct 0 ms 212 KB Failed to provide a successful strategy.
3 Partially correct 0 ms 212 KB Failed to provide a successful strategy.
4 Partially correct 1 ms 320 KB Failed to provide a successful strategy.
5 Partially correct 1 ms 212 KB Failed to provide a successful strategy.
6 Partially correct 1 ms 320 KB Failed to provide a successful strategy.
7 Partially correct 0 ms 212 KB Failed to provide a successful strategy.
8 Partially correct 1 ms 212 KB Failed to provide a successful strategy.
9 Partially correct 1 ms 212 KB Failed to provide a successful strategy.
10 Partially correct 1 ms 324 KB Failed to provide a successful strategy.
11 Partially correct 1 ms 320 KB Failed to provide a successful strategy.
12 Partially correct 1 ms 340 KB Failed to provide a successful strategy.
13 Partially correct 1 ms 364 KB Failed to provide a successful strategy.
14 Partially correct 1 ms 340 KB Failed to provide a successful strategy.
15 Partially correct 1 ms 340 KB Failed to provide a successful strategy.
16 Partially correct 1 ms 448 KB Failed to provide a successful strategy.
17 Partially correct 1 ms 340 KB Failed to provide a successful strategy.
18 Partially correct 1 ms 340 KB Failed to provide a successful strategy.
19 Partially correct 1 ms 340 KB Failed to provide a successful strategy.
20 Partially correct 1 ms 340 KB Failed to provide a successful strategy.

Subtask #3
0.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Partially correct 1 ms 212 KB Failed to provide a successful strategy.
3 Partially correct 1 ms 212 KB Failed to provide a successful strategy.
4 Partially correct 1 ms 212 KB Failed to provide a successful strategy.
5 Partially correct 1 ms 212 KB Failed to provide a successful strategy.
6 Partially correct 1 ms 212 KB Failed to provide a successful strategy.
7 Correct 0 ms 212 KB Output is correct
8 Incorrect 0 ms 212 KB Output isn't correct
9 Halted 0 ms 0 KB -