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58. Length of Last Word

Question

Given a string s consisting of some words separated by some number of spaces, return the length of the last word in the string.

A word is a maximal substring consisting of non-space characters only.

Example

Example1

Input: s = "Hello World"
Output: 5
Explanation: The last word is "World" with length 5.

Example2

Input: s = "   fly me   to   the moon  "
Output: 4
Explanation: The last word is "moon" with length 4.

Example3

Input: s = "luffy is still joyboy"
Output: 6
Explanation: The last word is "joyboy" with length 6.

Constraints

• 1 <= s.length <= 10^4
• s consists of only English letters and spaces ' '.
• There will be at least one word in s.

解題

題目

首先先簡單的翻譯一下題目
給一個字串，其中組成的字會由數量不一的空白隔開，回傳最後一個的字的長度。

Think

作法大致上是這樣

• 很簡單，就切割字串，然後找到最後一個字，再回傳他的長度。
• Python的話，先用strip()去除原始字串前後的空白去掉，再用split()以空白切割字串，會存在list_s中，最後index可以用-1找到最後一個字，再回傳長度就好。

Code

Python

class Solution:
    def lengthOfLastWord(self, s: str) -> int:
        list_s = s.strip().split(" ")
        # print(list_s)
        return len(list_s[-1])

C

int lengthOfLastWord(char * s){
    char *token;
    char *last_word;
    token = strtok(s, " ");

    while( token != NULL ) {
        // printf("%s\n", token);
        last_word = token;
        // printf("%s\n", last_word);
        token = strtok(NULL, " ");
        if (token == NULL){
            return strlen(last_word);
        }
    }

    return 1;
}

Result

• Python

  • 

• C

  • 

大家明天見