LeetCode : 205. Isomorphic Strings

[congr]

https://leetcode.com/problems/isomorphic-strings/

[congr]

class Solution {
    public boolean isIsomorphic(String s, String t) {
        Map<Character, Character> smap = new HashMap();
        Map<Character, Character> tmap = new HashMap();

        for (int i = 0; i < s.length(); i++) {
            char a = smap.getOrDefault(s.charAt(i), ' ');
            char b = tmap.getOrDefault(t.charAt(i), ' ');
            if (a == ' ' && b == ' ');
            else if (a != t.charAt(i) || b != s.charAt(i)) return false;

            smap.put(s.charAt(i), t.charAt(i));
            tmap.put(t.charAt(i), s.charAt(i));
        }

        return true;
    }
}

[congr]

class Solution {
    public boolean isIsomorphic(String s, String t) {
        Map<Character, Integer> smap = new HashMap<>();
        Map<Character, Integer> tmap = new HashMap<>();

        for (Integer i = 0; i < s.length(); i++) { // !!! Integer
            if (smap.put(s.charAt(i), i) != tmap.put(t.charAt(i), i)) 
                return false;
        }

        return true;
    }
}