245.Shortest Word Distance III

    /*
     * 245.Shortest Word Distance III 
     * 2016-6-18 by Mingyang
     * The only difference is now word1 could be the same as word2.
     * 这个题目可以分别用以上两种方法分别改装
     * 注意两个equal并不代表两个数的距离是0！！！！
     */

public int shortestWordDistance(String[] words, String word1, String word2) {
         int len=words.length;
            if(words==null||len==0)
              return 0;
            int first=-1;
            int second=-1;
            int res=Integer.MAX_VALUE;
            if(word1.equals(word2)){
                int pre=-1;
                for(int i=0;i<len;i++){
                    if(words[i].equals(word1)){
                        if(pre==-1){
                           pre=i; 
                           continue;
                        }else{
                            res=Math.min(res,i-pre);
                            pre=i;
                        }
                    }
                }
                return res;
            }
            for(int i=0;i<len;i++){
                if(words[i].equals(word1)){
                    first=i;
                }
                if(words[i].equals(word2)){
                    second=i;
                }
                if(first>=0&&second>=0){
                    res=Math.min(res,Math.abs(first-second));
                }
            }
            return res;
    }