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320. Generalized Abbreviation

Write a function to generate the generalized abbreviations of a word.

Example:

Given word = "word", return the following list (order does not matter):

["word", "1ord", "w1rd", "wo1d", "wor1", "2rd", "w2d", "wo2", "1o1d", "1or1", "w1r1", "1o2", "2r1", "3d", "w3", "4"]

 

 

 

public IList<string> GenerateAbbreviations(string word) {        List<string> res = new List<string>();        BackTracking(word,0,"",res,0);        return res;    }        private void BackTracking(string word,int sentinel, string cur, List<string> res, int isNumberbefore)    {        if(sentinel == word.Length)        {            if(isNumberbefore ==0) res.Add(cur);            else res.Add(cur+isNumberbefore);        }        else        {            if(isNumberbefore > 0) BackTracking(word, sentinel+1,cur+isNumberbefore+word[sentinel],res,0);            else BackTracking(word, sentinel+1,cur+word[sentinel],res,0);            BackTracking(word, sentinel+1,cur,res,isNumberbefore+1);        }    }

 

320. Generalized Abbreviation