Omenat

#include <iostream>
#include <list>

using namespace std;

bool haku(list<int> z, long s) {
	if (z.empty()) return false;
	int a = z.back();
	z.pop_back();
	if ((s + a) % 3 == 0) return true;
	if (haku(z, s + a)) return true;
	if (haku(z, s)) {
		z.push_back(a);
		return true;
	}
	z.push_back(a);
	return false;
}

int main() {
	cin.sync_with_stdio(false);
	int n, i;
	cin >> n;
	list<int> o = list<int>();
	int m = 0, s;
	for (i = 0; i < n; i++) {
		cin >> s;
		if (s % 3 == 0)
			m++;
		else
			o.push_back(s);
	}
	list<int>::iterator a ,b;
	list<int> z = list<int>();
	a = o.begin();
	b = o.end();
	long j = 0;
	int k = 0;
	while (a != b) {
		int q = *a;
		j += q;
		k++;
		if (j % 3 == 0) {
			m += k;
			j = k = 0;
			z.clear();
		} else z.push_back(q);
		a++;
	}
	while (!z.empty() && haku(z, 0)) {
		m++;
	}
	cout << m;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: WRONG ANSWER

Test 6

Group: 1

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 2

Verdict: WRONG ANSWER

Test 12

Group: 2

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED

Test 16

Group: 3

Verdict: ACCEPTED

Test 17

Group: 3

Verdict: ACCEPTED

Test 18

Group: 3

Verdict: ACCEPTED