leetcode/Isomorphic.java at main · singhishan/leetcode · GitHub

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class Isomorphic {
    public boolean isIsomorphic(String s, String t) {
        if(s.length() != t.length())
            return false;
        HashMap<Character,Character> map1 = new HashMap<>();
        HashMap<Character,Boolean> map2 = new HashMap<>();

        for(int i=0;i<s.length();i++){
            char ch1=s.charAt(i);
            char ch2=t.charAt(i);
            if(map1.containsKey(ch1)==true){
                if(map1.get(ch1) != ch2 )
                    return false;
            }
            else{
                if(map2.containsKey(ch2)==true)
                    return false;
                else{
                    map1.put(ch1,ch2);
                    map2.put(ch2, true);                }
            }
        }
        return true;


    }
}