Omenat

#include <bits/stdc++.h>


#define ll long long
using namespace std;


int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0);
    int n; cin >> n;
    ll sum = 0;
    int arr[n];
    bool m[3] = {0};
    for(int i = 0; i < n; ++i){
        cin >> arr[i];
        arr[i] %= 3;
        if(arr[i]%3==0)m[0]=1;
        else if(arr[i]%3==1)m[1]=1;
        else m[2]=1;
        sum+=arr[i];
    }
    if(!(sum%3))cout << n;
    else if((sum%3==1)&&m[1])cout << n-1;
    else cout << n-2;



    return 0;
}

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: WRONG ANSWER

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: WRONG ANSWER

Test 15

Group: 3

Verdict: ACCEPTED

Test 16

Group: 3

Verdict: ACCEPTED

Test 17

Group: 3

Verdict: ACCEPTED

Test 18

Group: 3

Verdict: ACCEPTED