LeetCode:Word Pattern

LeetCode:Word Pattern
1、タイトル:Given a pattern and a string str,find if str follows the same pattern.
Here follow means a full match, such that there is a bijection between a letter in pattern and a non-empty word in str.
Examples: pattern = “abba”, str = “dog cat cat dog” should return true. pattern = “abba”, str = “dog cat cat fish” should return false. pattern = “aaaa”, str = “dog cat cat dog” should return false. pattern = “abba”, str = “dog dog dog dog” should return false. Notes: You may assume pattern contains only lowercase letters, and str contains lowercase letters separated by a single space.
2、コード:ハッシュテーブルの物語で、文字列を処理します.次のようになります.
Isomorphic Strings(アイソトープ文字列)http://blog.csdn.net/bestzem/article/details/51953658

class Solution {
public:
    bool wordPattern(string pattern, string str) {
        string hash[26]{};
        auto iterp=pattern.begin(),iters=str.begin();
        for(auto iter1=iters+1;iterp!=pattern.end()&&iters!=str.end();++iter1)
        {
            if((iter1==str.end()||*iter1==' ')&&(hash[*iterp-97].empty()))
            {
                string s(iters,iter1);
                //             
                for(int i=0;i<26;++i)
                {
                    if(hash[i]==s)
                    {
                        return false;
                    }
                }
                hash[*iterp-97]=s;
                if(iter1!=str.end())
                        iters=iter1+1;
                else
                    iters=iter1;
                ++iterp;

             }
             else if((iter1==str.end()||*iter1==' ')&&(!hash[*iterp-97].empty()))
             {
                 //      ，  
                 if(hash[*iterp-97]!=string(iters,iter1))
                      return false;
                if(iter1!=str.end())
                        iters=iter1+1;
                else
                    iters=iter1;
                 ++iterp;
             }
        }
        //             
        if(iterp!=pattern.end()||iters!=str.end())      return false;
        return true;
    }
};