Q27 Word Pattern - LeetCode

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Thu Jan 26 2023 12:45:38 GMT+0000 (Coordinated Universal Time)

Saved by @Ayush_dabas07

class Solution {
    public boolean wordPattern(String pattern, String s) {
        //split the string to string[] 
        String[] words = s.split(" ");  //splitting at space

        //check if lengths are same 
        if(words.length != pattern.length())
        return false;
        
        //make a frequency map and map letters to strings 
        HashMap<Character , String > map = new HashMap<>();

        for(int i =0 ;i < pattern.length();i++){
            char ch = pattern.charAt(i);

            //check if ch is already present in the hashmap
            if(map.containsKey(ch)){

                //check if old and new mapped values are same
                if(map.get(ch).equals(words[i]) == false)
                return false;
            }

            //if ch is not present in the hashmap
            else{

                //but word is already mapped 
                if(map.containsValue(words[i]))
                return false;

                map.put(ch , words[i]);
            }
        }

        return true;
    }
}

https://leetcode.com/problems/word-pattern/

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