205. Isomorphic Strings

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本文介绍了一个C++实现的算法，用于判断两个字符串是否为同构字符串。即一个字符串中的字符是否能被替换得到另一个字符串，同时保持字符出现的顺序不变。

205. Isomorphic Strings

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Given two strings s and t, determine if they are isomorphic.

Two strings are isomorphic if the characters in s can be replaced to get t.

All occurrences of a character must be replaced with another character while preserving the order of characters. No two characters may map to the same character but a character may map to itself.

For example,
Given "egg", "add", return true.

Given "foo", "bar", return false.

Given "paper", "title", return true.

Note:
You may assume both s and t have the same length.

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class Solution {
public:
    int f[400],ff[400];
    bool isIsomorphic(string s, string t) {
      memset(f,0,sizeof(f));
      memset(ff,0,sizeof(ff));
       int len=s.length();
       for(int i=0;i<len;i++)
       {
           if(f[s[i]]){ if(f[s[i]]!=t[i]) return false;}
           if(ff[t[i]]){ if(ff[t[i]]!=s[i]) return false;}
           f[s[i]]=t[i];
           ff[t[i]]=s[i];
       }
       return true;
    }
};