O(n) time O(128) space
normalize
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| class Solution {
public:
bool isIsomorphic(string s, string t) {
int ms[128] = {0}, mt[128] = {0};
int n = s.length();
for (int i = 0; i < n; ++i) {
if (ms[s[i]] == 0) {
ms[s[i]] = i + 1;
}
if (mt[t[i]] == 0) {
mt[t[i]] = i + 1;
}
if (ms[s[i]] != mt[t[i]]) return false;
}
return true;
}
};
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