oj.uz

답안 #638289

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
638289 2022-09-05T08:21:03 Z delrey Logičari (COCI21_logicari) C++14
0 / 110
 87 ms 7028 KB 
#include <bits/stdc++.h>

using namespace std;

int n;
vector <int> v[100000];
bool blue[100000], notBlue[100000];

int main()
{
    cin>>n;
    for(int i = 0; i < n; i++)
    {
        int a, b;
        cin>>a>>b;
        a--;
        b--;
        v[a].push_back(b);
        v[b].push_back(a);
    }
    int res = 0;
    for(int i = 0; i < n; i++)
    {
        if(blue[i] || notBlue[i])
            continue;
        blue[i] = true;
        res++;
        for(auto j : v[i])
            for(auto t : v[j])
                notBlue[t] = true;
    }
    for(int i = 0; i < n; i++)
    {
        bool seesBlue = false;
        for(auto j : v[i])
            if(blue[j])
            {
                seesBlue = true;
                break;
            }
        if(!seesBlue)
        {
            cout<<-1<<endl;
            return 0;
        }
    }
    cout<<res<<endl;
    return 0;
}

Subtask #1
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Incorrect 87 ms 7028 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 2644 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 2644 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 50.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Incorrect 87 ms 7028 KB Output isn't correct
6 Halted 0 ms 0 KB -