Omenat

#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int n;
  cin >> n;
  int a[n];
  int w[3] {};
  for (int i = 0; i < n; ++i) {
    cin >> a[i];
    w[a[i] % 3]++;
  }
  int ans = 0;
  for (int a = 0; a < 1; ++a) {
    for (int b = 0; b < 3; ++b) {
      if (w[1] < b) continue;
      for (int c = 0; c < 3; ++c) {
        if (w[2] < c) continue;
        if (((w[1] - b) + (w[2] - c) * 2) % 3) continue;
        ans = max(ans, w[0] + w[1] + w[2] - b - c);
      }
    }
  }
  cout << ans << endl;
}

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: ACCEPTED

Test 6

Group: 1

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 2

Verdict: ACCEPTED

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