leetcode/daily128.java at main · iFangg/leetcode · GitHub

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// Solution 1
class Solution {
    public int isPrefixOfWord(String sentence, String searchWord) {
        /*
        split string into word array
        match characters until we find the right prefix
        */

        String[] words = sentence.split("\\s+");
        for (int i = 0; i < words.length; i++) {
            String w = words[i];
            int w_idx = 0;
            int s_idx = 0;
            while (s_idx < searchWord.length() && w_idx < w.length()) {
                if (w.charAt(w_idx) != searchWord.charAt(s_idx))
                    break;

                s_idx++;
                w_idx++;
            }

            if (s_idx == searchWord.length())
                return i + 1;
        }

        return -1;
    }
}


// Solution 2
class Solution {
    public int isPrefixOfWord(String sentence, String searchWord) {
        String arr[]=sentence.split(" ");
        for(int i=0;i<arr.length;i++){
            if(arr[i].startsWith(searchWord))
            return i+1;
        }
        return -1;
    }
}