【LeetCode】205. Isomorphic Strings 解题小结

题目：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.

设置两个cs和ct数组，记录目前遍历字符串s和t的下标i+1，如果两者不相等，返回false。

class Solution {
public:
    bool isIsomorphic(string s, string t) {
        int cs[255] = {0}, ct[255] = {0};
        for (int i = 0; i < s.size(); ++i){
            if (cs[s[i]] != ct[t[i]])
                return false;
            else{
                cs[s[i]] = i + 1;
                ct[t[i]] = i + 1;
            }
        }
        return true;
    }
};