java - creating a word transformation graph -


i'm trying create graph of words dictionary adjacent words in graph should agree of these 2 rules: 1) 1 of words has 1 more character, , without character, identical 2) of equal length , identical except 1 letter (one-character substitution)

i wrote 2 methods create graph.

first one(addladder), uses first rule, working properly: i'm having trouble second method (addeq) uses second rule:

 public static void addladder(){          for(map.entry<integer,set<string>> e:themap.entryset())         {             int thewordlen = e . getkey ( ) ;             set<string>thewords = e.getvalue( );          if(thewordlen>1){             set<string>shorterwords = themap.get(thewordlen-1);             for(string s :thewords)             {                 for(int i=0; i<thewordlen ; i++)                 {                     string shorter = removeonechar (s,i);                     if(shorterwords.contains( shorter ) )                     {                         addedge(s,shorter,s.length());                         addedge(shorter,s,s.length());                     }                 }             }           }          }     }       public static void addeq(){          for(map.entry<integer,set<string>> e:themap.entryset())         {             int thewordlen = e.getkey ( ) ;             set<string>thewords = e.getvalue( );             for(int i=0; i<thewordlen ; i++)             {                  map<string , list<string>>repmap = new treemap<string , list<string>>();                 list<string> mylist = new arraylist<string>();                 for(string w:thewords  )                 {                     string shorter = removeonechar(w,i);                     mylist.add(shorter);                     repmap.put(w, mylist);                  }      } }

}

thanks tips.

just check words character per character long edit distance 1: e.g.:

private boolean ruletwo (string s1, string s2) {     if (s1.length() != s2.length())         return false;       int different = 0;     (int i=0; i<s1.length() && different <= 1; i++)     {         if (s1.charat(i) != s2.charat(i))             different ++;     }      return different == 1; }

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