LeetCode Isomorphic Strings

Isomorphic Strings

 

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.       

class Solution {public:    bool isIsomorphic(string s, string t) {        int n = s.size();            int hashs[256] = {0};        int hasht[256] = {0};               for(int i=0;i<n;i++){             if(hashs[s[i]]==0&&hasht[t[i]]==0){                 hashs[s[i]] = i+1;                 hasht[t[i]] = i+1;             }             else if(hashs[s[i]]!=hasht[t[i]]) return false;        }        return true;    }};