check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence.cpp

//question//


Given a sentence that consists of some words separated by a single space, and a searchWord, check if searchWord is a prefix of any word in sentence.

Return the index of the word in sentence (1-indexed) where searchWord is a prefix of this word. If searchWord 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 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 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 = "i am tired", searchWord = "you"
Output: -1
Explanation: "you" is not a prefix of any word in the sentence.
Example 4:

Input: sentence = "i use triple pillow", searchWord = "pill"
Output: 4
Example 5:

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

Constraints:

1 <= sentence.length <= 100
1 <= searchWord.length <= 10
sentence consists of lowercase English letters and spaces.
searchWord consists of lowercase English letters.


//solution//


class Solution {
public:
    int isPrefixOfWord(string sentence, string searchWord) {
        int count =0;
        for(int i=0;i<sentence.size();i++)
        {
            count++;
            string word="";
            while(sentence[i]!=' ')
            {
                word += sentence[i];
                i++;
                if(i==sentence.size())
                {
                    break;
                }
            }
            if(searchWord.size()<=word.size())
            {
                string check = word.substr(0,searchWord.size());
                if(check==searchWord)
                {
                    return count;
                }
            }
                
        }
        return -1;
    }
};