Submission #753280

#	Time	Username	Problem	Language	Result	Execution time	Memory
753280		boyliguanhan	Tug of War (BOI15_tug)	C++17	23 / 100	29 ms	11596 KiB

tug

#include<bits/stdc++.h>
using namespace std;
multiset<int> adj[200100];
queue<int> q;
int main() {
    int n;
    cin >> n;
    n*=2;
    for(int i = 1; i <= n; i++) {
        int x, y, z;
        cin >> x >> x >> y;
        y+=n/2;
        adj[x].insert(y);
        adj[y].insert(x);
    }
    for(int i = 1; i <= n; i++) {
        if(!adj[i].size()) {
            cout << "NO\n";
            return 0;
        }
        if(adj[i].size()<2)
            q.push(i);
    }
    while(q.size()) {
        int x = q.front(), i = *adj[x].begin();
        q.pop();
        adj[i].erase(x);
        if(!adj[i].size()) {
            cout << "NO\n";
            return 0;
        }
        if(adj[i].size()<2)
            q.push(i);
    }
    cout << "YES\n";
}

Compilation message (stderr)

tug.cpp: In function 'int main()':
tug.cpp:10:19: warning: unused variable 'z' [-Wunused-variable]
   10 |         int x, y, z;
      |                   ^

• Subtask 1: 0 / 18
• Subtask 2: 0 / 30
• Subtask 3: 23 / 23
• Subtask 4: 0 / 29