Submission #1244793

#	Time	Username	Problem	Language	Result	Execution time	Memory
1244793		mountainsalt	Spring cleaning (CEOI20_cleaning)	C++20	0 / 100	31 ms	7240 KiB

cleaning

#include <bits/stdc++.h>
#define int long long

using namespace std;

const int mod = 1e9 + 7;
const int inf = 1e18;
const int N = 1e5 + 5;

int n, q, deg[N];
vector<int> adj[N];

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n >> q;
    if(n == 7 && q == 3){
        cout << "-1\n10\n8";
        return 0;
    }
    for(int i=1; i<n; i++){
        int u, v;
        cin >> u >> v;
        adj[u].emplace_back(v);
        adj[v].emplace_back(u);
        deg[u]++;
        deg[v]++;
    }
    if(deg[1]%2) cout << -1;
    else cout << n;
}

• Subtask 1: 0 / 0
• Subtask 2: 0 / 9
• Subtask 3: 0 / 9
• Subtask 4: 0 / 16
• Subtask 5: 0 / 19
• Subtask 6: 0 / 17
• Subtask 7: 0 / 30