03. Print in Parts

#include <iostream>
#include <memory>

using namespace std;

int main() {
    int row, col, r, c;
    cin >> row >> col;

    int matrixElements = row * col;

    unique_ptr<int[]> matrix = make_unique<int[]>(matrixElements);

    for (int i = 0; i < matrixElements; i++) {
        cin >> matrix[i];
    }

    cin >> r >> c;

    for (int i = 0; i < r; i++) {
        for (int j = 0; j < c; j++) {
            cout << matrix[i * col + j] << ' ';
        }
        cout << endl;
    }
    return 0;
}