Problem1-7.java

public void fillZeros(int[][] matrix) {
  int numRows = matrix.length;
  int numCols = matrix[0].length;
  
  boolean[] rows = new boolean[numRows];
  boolean[] cols = new boolean[numCols];
  
  for (int i = 0; i < numRows; i++) {
    for (int j = 0; j < numCols; j++) {
      if (matrix[i][j] == 0) {
        rows[i] = true;
        cols[j] = true;
      }
    }
  }
  
  // seconds pass fill if it's empty
  for (int i = 0; i < numRows; i++) {
    for (int j = 0; j < numCols; j++) {
      if (rows[i] || cols[j]) {
        matrix[i][j] = 0;
      }
    }
  }
}