a058: MOD3 FYI: https://yunlinsong.blogspot.com/2016/02/mod3.html

a058.cpp

#include <iostream>
using namespace std;

int main() {
	int num;
	int i = 0;
	int result[3] = { 0, 0, 0 };
	cin >> num;

    while(i < num)
	{
		int in;
		cin >> in;
		
		result[in % 3]++;
		i++;
    }
	
	cout << result[0] << " " << result[1] << " " << result[2] << endl;
    return 0;
}