Tanssiaiset

input/code.cpp: In function 'int main()':
input/code.cpp:44:22: warning: 'inci' may be used uninitialized in this function [-Wmaybe-uninitialized]
         if(i != inci && (x[i].first == inc.first || x[i].second == inc.second || x[i].second == inc.first || x[i].first == inc.second ))
                      ^

#include <iostream>
#include <vector>
#include <array>
#include <bitset>

using namespace std;

int main()
{
    int n;
    
    cin >> n;
    
    bitset<100000> f;
    
    int npairs = n / 2 + 1;
    vector<pair<int, int>> x;
    pair<int, int> inc = {-1, -1};
    int inci;
    for(int i = 0; i < npairs; i++)
    {
        int a, b;
        cin >> a;
        cin >> b;
        
        if(inc.first == -1)
        {
            if(f[a] || f[b])
            {
                inc = {a, b};
                inci = i;
            }
            else f[a] = 1, f[b] = 1;
        }

        x.push_back({a, b});
    }
    
    pair<int, int> g;
    
    int count = 0;
    for(int i = 0; i < npairs; i++)
    {
        if(i != inci && (x[i].first == inc.first || x[i].second == inc.second || x[i].second == inc.first || x[i].first == inc.second ))
        {
            if(count == 1)
            {
                g = inc;
                break;
            }
            else
            {
                g = x[i];
                count++;
            }
            
        }
    }
    
    cout << g.first << " " << g.second;

}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED