c# - Implement a function to return top rated movies in the network of movie -

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given class below: 

public class movie {     private readonly char movieid;     private readonly float rating;     private list<movie> similarmovies; // similarity bidirectional      public movie(char movieid, float rating)     {         this.movieid = movieid;         this.rating = rating;         similarmovies = new list<movie>();     }      public char getid()     {         return movieid;     }      public float getrating()     {         return rating;     }      public void addsimilarmovie(movie movie)     {         similarmovies.add(movie);         movie.similarmovies.add(this);     }      public list<movie> getsimilarmovies()     {         return similarmovies;     }           public static ilist<movie> getmovierecommendations(movie movie, int numtopratedsimilarmovies)     {         //implement method                  return null;     } } 

reachable current movie          eg:            a(rating 1.2)                         /   \                      b(2.4)  c(3.6)                        \     /                         d(4.8)
in above example edges represent similarity , number rating. getmovierecommendations(a,2)should return c , d (sorting order doesn't matter can return d , c) getmovierecommendations(a,4) should return a, b, c, d (it can return these in order eg: b,c,d,a) getmovierecommendations(a,1) should return d. note distance d doesn't matter

 public static hashset<movie> sd = new hashset<movie>();     public static ilist<movie> getmovierecommendations(movie movie, int numtopratedsimilarmovies)     {         sd.add(movie);         foreach (movie m in movie.getsimilarmovies())         {             if (!sd.contains(m))                 getmovierecommendations(m, -1);         }         if(numtopratedsimilarmovies > -1)             return sd.orderbydescending(o => o.rating).take(numtopratedsimilarmovies).tolist();                     return null;     }

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