Tietoverkko

input/code.cpp: In function 'int main()':
input/code.cpp:27:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < cnxn.size(); i++) {
                    ^
input/code.cpp:37:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < abc.size(); i++) {
                    ^
input/code.cpp:39:30: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
         if (aaaa.first == 1  && aaaa.second == 1 || aaaa.first == 0 || aaaa.second == 0) {
                              ^

#include <iostream>
#include <map>
#include <utility>
#include <tuple>
#include <vector>

using namespace std;

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

	vector<pair<int, int> > cnxn(n);

	for (int i = 0; i < n; i++) {
		int a;
		int b;
		cin >> a;
		cin >> b;
		cnxn.push_back(make_pair(a, b));
	}

			// tulevat, lähtevät
	vector<pair<int, int> > abc(n, make_pair(0,0));

	cout << abc.size() << endl;
	for (int i = 0; i < cnxn.size(); i++) {
		int a = cnxn[i].first;
		int b = cnxn[i].second;

		abc[a].second++;
		abc[b].first++;
	}

	int c = 0;

	for (int i = 0; i < abc.size(); i++) {
        pair<int,int> aaaa = abc[i];
        if (aaaa.first == 1  && aaaa.second == 1 || aaaa.first == 0 || aaaa.second == 0) {
            c++;
			//cout << aaaa.first << " " << aaaa.second << endl;
        }
	}

	cout << c << endl;
	return 0;
}

Test 1

Group: 1

Verdict: WRONG ANSWER

Test 2

Group: 1

Verdict: WRONG ANSWER

Test 3

Group: 1

Verdict: WRONG ANSWER

Test 4

Group: 1

Verdict: WRONG ANSWER

Test 5

Group: 1

Verdict: WRONG ANSWER

Test 6

Group: 2

Verdict: WRONG ANSWER

Test 7

Group: 2

Verdict: WRONG ANSWER

Test 8

Group: 2

Verdict: WRONG ANSWER

Test 9

Group: 2

Verdict: WRONG ANSWER

Test 10

Group: 2

Verdict: WRONG ANSWER