Omenat

input/code.cpp: In function 'int main()':
input/code.cpp:26:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for ( int i = 0; i < input.length(); ++i )
                        ^

#include <iostream>
#include <cstdlib>
#include <algorithm>

int main()
{
    std::cin.sync_with_stdio( false );
    
    int appleCount;
    std::cin >> appleCount;
    std::cin.get();

    std::string input;
    getline( std::cin, input );
    input += ' ';

    int* weights = new int[ appleCount ];
    int applesPicked = 0;
    int totalWeight = 0;
    int output = 0;

    int cursor = 0;
    int weightsParsed = 0;

    for ( int i = 0; i < input.length(); ++i )
    {
        if ( input[ i ] == ' ' )
        {
            int value = atoi( input.substr( cursor, i - cursor ).c_str() );
            
            
            if ( value % 3 == 0 )
            {
                weights[ weightsParsed ] = -1;
                applesPicked++;
                totalWeight += value;
            }
            else
            {
                weights[ weightsParsed ] = value;
            }

            cursor = i + 1;
            weightsParsed++;
        }
    }

    output = applesPicked;
    std::sort( weights, weights + appleCount );

    for ( int i = 0; i < appleCount; ++i )
    {
        if ( weights[ i ] >= 0 )
        {
            applesPicked++;
            totalWeight += weights[ i ];
        }

        if ( totalWeight % 3 == 0 )
        {
            output = applesPicked;
        }
    }

    std::cout << output;
    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: 1

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

Test 11

Group: 2

Verdict: WRONG ANSWER

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: WRONG ANSWER

Test 17

Group: 3

Verdict: WRONG ANSWER

Test 18

Group: 3

Verdict: WRONG ANSWER