LeetCode 0205 - Isomorphic Strings

Input: s = "egg", t = "add"
Output: true

Input: s = "foo", t = "bar"
Output: false

Input: s = "paper", t = "title"
Output: true

class Solution {
public:
    bool isIsomorphic(string s, string t) {
        vector<int> sIndex(256, 0);
        vector<int> tIndex(256, 0);
        for(int i = 0; s[i]; i++) {
            if(sIndex[s[i]] != tIndex[t[i]])
                return false;
            sIndex[s[i]] = i + 1;
            tIndex[t[i]] = i + 1;
        }
        return true;
    }
};