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_1 , int var_2 , int var_3 ) {
    if ( var_3 > 0 && var_1 . containsKey ( var_2 + var_3 ) ) {
      var_1 . get ( var_2 + var_3 ) . add ( var_3 ) ;
    }
  }
  