MatrixRegionSumNaive

matrixRegionSumNaive

public int matrixRegionSumNaive(int[][] matrix, Coordinate A, Coordinate D) {
  int result = 0;
  for (int j = A.y; j < matrix.length; j++) {
    for (int i = A.x; i < matrix[0].length; i++) {
      result += matrix[i][j];
    }
  }
  return result;
}

public class Coordinate {
  protected int x;
  protected int y;
  public Coordinate(int x, int y) {
    this.x = x;
    this.y = y;
  }
}