Tanssiaiset

input/code.cpp: In function 'int main()':
input/code.cpp:14:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int j = 0; j < p.size(); j++) {
                     ^

#include <bits/stdc++.h>
using namespace std;

int main() {
	int n;
	cin >> n;

	vector<int> p;
	int c[4];
	int d = 0;
	for (int i = 0; i < n/2 + 1; i++) {
		int a,b;
		cin >> a >> b;
		for (int j = 0; j < p.size(); j++) {
			if (a == p[j]) {
				c[d++] = i*2;
				c[d++] = j;
				break;
			} else if (b == p[j]) {
				c[d++] = i*2+1;
				c[d++] = j;
				break;
			}
		}
		p.push_back(a);
		p.push_back(b);
		if (d > 3) break;
	}

	for (int i = 0; i < 4; i++) {
		if (c[i]%2 == 0)
			for (int j = 0; j < 4; j++)
				if (c[j] == c[i] + 1)
					cout << p[c[i]] << " " << p[c[j]] << endl;
	}
	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: ACCEPTED

Test 7

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 8

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: TIME LIMIT EXCEEDED