原文链接: https://leetcode-cn.com/problems/check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence

英文原文

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.

中文题目

给你一个字符串 sentence 作为句子并指定检索词为 searchWord ，其中句子由若干用 单个空格 分隔的单词组成。

请你检查检索词 searchWord 是否为句子 sentence 中任意单词的前缀。

• 如果 searchWord 是某一个单词的前缀，则返回句子 sentence 中该单词所对应的下标（下标从 1 开始）。
• 如果 searchWord 是多个单词的前缀，则返回匹配的第一个单词的下标（最小下标）。
• 如果 searchWord 不是任何单词的前缀，则返回 -1 。

字符串 S 的 前缀 是 S 的任何前导连续子字符串。

 

示例 1：

输入：sentence = "i love eating burger", searchWord = "burg"
输出：4
解释："burg" 是 "burger" 的前缀，而 "burger" 是句子中第 4 个单词。

示例 2：

输入：sentence = "this problem is an easy problem", searchWord = "pro"
输出：2
解释："pro" 是 "problem" 的前缀，而 "problem" 是句子中第 2 个也是第 6 个单词，但是应该返回最小下标 2 。

示例 3：

输入：sentence = "i am tired", searchWord = "you"
输出：-1
解释："you" 不是句子中任何单词的前缀。

示例 4：

输入：sentence = "i use triple pillow", searchWord = "pill"
输出：4

示例 5：

输入：sentence = "hello from the other side", searchWord = "they"
输出：-1

 

提示：

• 1 <= sentence.length <= 100
• 1 <= searchWord.length <= 10
• sentence 由小写英文字母和空格组成。
• searchWord 由小写英文字母组成。
• 前缀就是紧密附着于词根的语素，中间不能插入其它成分，并且它的位置是固定的——-位于词根之前。（引用自 前缀_百度百科 ）

通过代码

高赞题解

解题思路

此处撰写解题思路

代码

class Solution {
public:
    int isPrefixOfWord(string sentence, string searchWord) {
        istringstream ss(sentence);
        string str;
        for (int i = 1; ss >> str; i ++)
            if (str.find(searchWord) == 0) return i;
        return -1;
    }
};

统计信息

通过次数	提交次数	AC比率
12463	19847	62.8%

提交历史

提交时间	提交结果	执行时间	内存消耗	语言