LeetCode 205. Isomorphic Strings

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public class Solution {    public boolean isIsomorphic(String s, String t) {        if (s.length() == 0) return true;        Map<Character, Character> map = new HashMap<Character, Character>();        for (int i = 0; i < s.length(); i++) {        char cs = s.charAt(i);        char ct = t.charAt(i);        if (map.containsKey(cs)) {        if (map.get(cs) != ct) return false;        } else if (map.containsValue(ct)) return false;        else map.put(cs, ct);        }        return true;    }}

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