comefrom: <awangdev>200. Number of Islands_3.java
code: private int convertToIndex(int x, int y, int rowLength) {
  
          return x * rowLength + y;
      }
masked: private int sample_funcname ( int var_0 , int var_1 , int var_2 ) {
    return var_0 * var_2 + var_1 ;
  }
  