02. Modulated Sum

#include <iostream>
#include <vector>
#include <cmath>

using namespace std;

int main()
{
    int rows;
    int columns;
    int row;
    int sum = 0;
    int modul;
    cin >> columns >> rows;

    vector<int> vect;

    for(int i = 0; i < columns; ++i)
    {
        for(int j = 0; j < rows; ++j)
        {
            cin >> row;
            vect.push_back(row);

        }

    }

    cin >> modul;
    int counter = 0;

    for(int k = 0; k < rows; ++k)
    {
        for(int l = k; l < vect.size(); l+= rows )
        {
            sum += vect[l];
            counter++;
            if(counter == columns)
            {
                cout << abs(sum % modul) << " ";
                sum = 0;
                counter = 0;
            }
        }

    }

    return 0;
}