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import java.util.Arrays;
public class Ch1 {
public static void main(String[] args) {
System.out.println(Arrays.deepToString(twod_array(new int[]{1, 2, 3, 4}, 2, 2)));
System.out.println(Arrays.deepToString(twod_array(new int[]{1, 2, 3}, 1, 3)));
System.out.println(Arrays.deepToString(twod_array(new int[]{1, 2, 3, 4}, 4, 1)));
}
private static int[][] twod_array(int[] arr, int r, int c) {
if (r * c != arr.length) return new int[0][0];
int[][] res = new int[r][c];
for (int i = 0; i < r; ++i) {
for (int j = 0; j < c; ++j) {
res[i][j] = arr[i * c + j];
}
}
return res;
}
}
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