Cetvrta

#include<bits/stdc++.h>
using namespace std;
#define all(x) x.begin(), x.end()
using ii=long long;
int main()
{
    map<int, int> x;
    map<int, int> y;
    for (int j = 0; j < 3; ++j) {
        int X, Y;
        cin >> X >> Y;
        x[X]++;
        y[Y]++;
    }
    for (auto u : x) {
        if (u.second != 2) cout << u.first << " ";
    }
    for (auto u : y) {
        if (u.second != 2) cout << u.first << " ";
    }
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED