comefrom: <awangdev>253. Meeting Rooms II_1.java
code: private int[] extract(int[][] intervals, int index) {
  
          int[] array = new int[intervals.length];
          for (int i = 0; i < intervals.length; i++) {
              array[i] = intervals[i][index];
          }
          Arrays.sort(array);
          return array;
      }
masked: private int [ ] sample_funcname ( int [ ] [ ] var_0 , int var_1 ) {
    int [ ] var_2 = new int [ var_0 . length ] ;
    for ( int var_3 = 0 ;
    var_3 < var_0 . length ;
    var_3 ++ ) {
      var_2 [ var_3 ] = var_0 [ var_3 ] [ var_1 ] ;
    }
    Arrays . sort ( var_2 ) ;
    return var_2 ;
  }
  