comefrom: <awangdev>1. Two Sum_1.java
code: public int[] twoSum(int[] nums, int target) {
          int[] rst = new int[2];
          if (nums == null || nums.length <= 1) return rst;
  
          Map<Integer, Integer> map = new HashMap<>();
          for (int i = 0; i < nums.length; i++) {
              if (map.containsKey(target - nums[i])) {
                  rst[0] = map.get(target - nums[i]);
                  rst[1] = i;
                  break;
              } 
              map.put(nums[i], i);
          }
          return rst;
      }
masked: public int [ ] sample_funcname ( int [ ] var_0 , int var_1 ) {
    int [ ] var_2 = new int [ 2 ] ;
    if ( var_0 == null || var_0 . length <= 1 ) return var_2 ;
    Map < Integer , Integer > var_3 = new HashMap < > ( ) ;
    for ( int var_4 = 0 ;
    var_4 < var_0 . length ;
    var_4 ++ ) {
      if ( var_3 . containsKey ( var_1 - var_0 [ var_4 ] ) ) {
        var_2 [ 0 ] = var_3 . get ( var_1 - var_0 [ var_4 ] ) ;
        var_2 [ 1 ] = var_4 ;
        break ;
      }
      var_3 . put ( var_0 [ var_4 ] , var_4 ) ;
    }
    return var_2 ;
  }
  