Check If a Word Occurs As a Prefix of Any Word in a Sentence LeetCode Solution - The Coding Shala

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 In this post, we will learn how to solve LeetCode's Check If a Word Occurs As a Prefix of Any Word in a Sentence problem and will implement its solution in Java.

Check If a Word Occurs As a Prefix of Any Word in a Sentence Problem

Given a sentence that consists of some words separated by a single space, and a search word. You have to check if the search word is a prefix of any word in a sentence. Return the index of the word in a sentence where the search word is a prefix of this word (1-indexed). If the search word is a prefix of more than one word, return the index of the first word (minimum index). If there is no such word return -1. A prefix of a string S is any leading contiguous substring of S.

Example 1:
Input: sentence = "i love eating burger", searchWord = "burg"
Output: 4
Explanation: "burg" is the prefix of "burger" which is the 4th word in the sentence.

Example 2:
Input: sentence = "this problem is an easy problem", searchWord = "pro"
Output: 2
Explanation: "pro" is the prefix of "problem" which is the 2nd and the 6th word in the sentence, but we return 2 as it's the minimal index.

Example 3:
Input: sentence = "hello from the other side", searchWord = "they"
Output: -1

Practice this problem on LeetCode(Click Here).

Check If a Word Occurs As a Prefix of Any Word in a Sentence Java Solution

Approach 1

Simple solution by using split and Java's startsWith() method.

Java Program: 

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

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