Omenat

input/code.cpp: In function 'int main()':
input/code.cpp:19:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld", &syote);
                        ^

#include <stdio.h>
#include <iostream>
#include <algorithm>
#include <vector>

using namespace std;

int main() {
	
	cin.sync_with_stdio(false);
	
	long long maara = 0;
	vector<long long> omenat;
	
	cin >> maara;
	
	for (long long i = 0; i < maara; i++) {
		long long syote;
		scanf("%lld", &syote);
		omenat.push_back(syote);
	}
	
	vector<long long> jakojaannokset;
	
	for (long long i = 0; i < maara; i++) {
		jakojaannokset.push_back(omenat[i] % 3);
	}
	
	long long nollat = count(jakojaannokset.begin(), jakojaannokset.end(), 0);
	long long ykkoset = count(jakojaannokset.begin(), jakojaannokset.end(), 1);
	long long kakkoset = count(jakojaannokset.begin(), jakojaannokset.end(), 2);
	
	
	while (ykkoset >= 3) {
		nollat += 3;
		ykkoset -= 3;
	}
	
	while (kakkoset >= 3) {
		nollat += 3;
		kakkoset -= 3;
	}
	
	while (kakkoset > 0 && ykkoset > 0) {
		nollat += 2;
		ykkoset--;
		kakkoset--;
	}
	
	//cout << "modulo 0: " << nollat << "\n";
	//cout << "modulo 1: " << ykkoset << "\n";
	//cout << "modulo 2: " << kakkoset << "\n";
	
	cout << nollat << '\n';
	
}

Test 1

Group: 1

Verdict: WRONG ANSWER

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: WRONG ANSWER

Test 6

Group: 1

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: WRONG ANSWER

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: WRONG ANSWER

Test 10

Group: 2

Verdict: WRONG ANSWER

Test 11

Group: 2

Verdict: ACCEPTED

Test 12

Group: 2

Verdict: WRONG ANSWER

Test 13

Group: 3

Verdict: WRONG ANSWER

Test 14

Group: 3

Verdict: WRONG ANSWER

Test 15

Group: 3

Verdict: WRONG ANSWER

Test 16

Group: 3

Verdict: ACCEPTED

Test 17

Group: 3

Verdict: ACCEPTED

Test 18

Group: 3

Verdict: ACCEPTED