Tanssiaiset

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    int oppilaat[10000];
    for(int i=1;i<=n;++i){
        oppilaat[i]=0;
    }
    vector <pair<int,int> > parit;
    vector <int> y;
    int tmp1,tmp2;
    for(int i=0;i<n/2+1;++i){
        cin>>tmp1>>tmp2;
        oppilaat[tmp1]+=1;
        oppilaat[tmp2]+=1;
        if(oppilaat[tmp1]==2){
            y.push_back(tmp1);
        }
        if(oppilaat[tmp2]==2){
            y.push_back(tmp2);
        }
        
        parit.push_back(make_pair(tmp1,tmp2));
    }
    //cout<<y[0]<<" "<<y[1];
    for(int i=0;i<n/2+1;++i){
        if(parit[i].first==y[1] || parit[i].second==y[0]){
            cout<<y[1]<<" "<<y[0]<<"\n";
            return 0;
        }
        if(parit[i].first==y[0] || parit[i].second==y[1]){
            cout<<y[0]<<" "<<y[1]<<"\n";
            return 0;
        }
    }
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: WRONG ANSWER

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: WRONG ANSWER

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: RUNTIME ERROR

Test 7

Group: 2

Verdict: RUNTIME ERROR

Test 8

Group: 2

Verdict: RUNTIME ERROR

Test 9

Group: 2

Verdict: RUNTIME ERROR

Test 10

Group: 2

Verdict: RUNTIME ERROR