comefrom: <awangdev>Missing Number_3.java
code: public int missingNumber(int[] nums) {
          if (nums == null || nums.length == 0) {
  	        return 0;
          }
          int result = nums.length;
          for (int i = 0; i < nums.length; i++) {
              result = result ^ nums[i] ^ i;
          }
          return result;
      }
masked: public int sample_funcname ( int [ ] var_0 ) {
    if ( var_0 == null || var_0 . length == 0 ) {
      return 0 ;
    }
    int var_1 = var_0 . length ;
    for ( int var_2 = 0 ;
    var_2 < var_0 . length ;
    var_2 ++ ) {
      var_1 = var_1 ^ var_0 [ var_2 ] ^ var_2 ;
    }
    return var_1 ;
  }
  