Isomorphic Strings - LeetCode

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.

思路：创建两个map，进行匹配。

 1 class Solution {
 2 public:
 3     bool isIsomorphic(string s, string t) {
 4         if (s.size() != t.size()) return false;
 5         map<char, int> sdict, tdict;
 6         for (int i = 0, n = s.size(); i < n; i++)
 7         {
 8             if (sdict[s[i]] != tdict[t[i]])
 9                 return false;
10             sdict[s[i]] = tdict[t[i]] = i + 1;
11         }
12         return true;
13     }
14 };