comefrom: <awangdev>Frog Jump_1.java
code: private void move(Map<Integer, Set<Integer>> dp, int stone, int step) {
  
          if (step > 0 && dp.containsKey(stone + step)) {
              dp.get(stone + step).add(step);
          }
      }
masked: private void var_0 ( Map < Integer , Set < Integer >> var_4 , int var_5 , int var_6 ) {
    if ( var_6 > 0 && var_4 . containsKey ( var_5 + var_6 ) ) {
      var_4 . get ( var_5 + var_6 ) . add ( var_6 ) ;
    }
  }
  