58. Length of Last Word Solution:
Easy
Given a string s consisting of words and spaces, return the length of the last word in the string.
A word is a maximal substring[^1] consisting of non-space characters only.
Example 1:
- Input:
s = "Hello World" - Output:
5 - Explanation:
The last word is "World" with length 5.
Example 2:
- Input:
s = " fly me to the moon " - Output:
4 - Explanation:
The last word is "moon" with length 4.
Example 3:
- Input:
s = "luffy is still joyboy" - Output:
6 - Explanation:
The last word is "joyboy" with length 6.
Constraints:
1 <= s.length <= 104sconsists of only English letters and spaces- There will be at least one word in
s.
[^1]: Substring A substring is a contiguous non-empty sequence of characters within a string.
Solution:
To solve this problem, we can follow these steps:
- Trim the String: Remove any leading or trailing spaces.
- Split the String into Words: Use spaces as the delimiter to split the string into an array of words.
- Find the Last Word: Get the last element of the resulting array.
- Calculate the Length: Return the length of the last word.
Let’s implement this solution in PHP: 58. Length of Last Word
<?php
// Example usage:
$s1 = "Hello World";
$s2 = " fly me to the moon ";
$s3 = "luffy is still joyboy";
echo lengthOfLastWord($s1); // Output: 5
echo lengthOfLastWord($s2); // Output: 4
echo lengthOfLastWord($s3); // Output: 6
?>Explanation:
- Trim the String: The
trimfunction removes any leading and trailing whitespace from the string. This ensures that we don’t have extra spaces affecting our word splitting. - Split the String: The
explodefunction splits the string into an array of words using a space' 'as the delimiter. - Get the Last Word: The
endfunction moves the internal pointer of the array to its last element and returns its value, which is the last word in our case. - Calculate the Length: The
strlenfunction returns the length of the string, which is the length of the last word.
Example Walkthrough:
- For
s = "Hello World":- Trimmed string:
"Hello World" - Words array:
["Hello", "World"] - Last word:
"World" - Length of last word:
5
- Trimmed string:
- For
s = " fly me to the moon ":- Trimmed string:
"fly me to the moon" - Words array:
["fly", "me", "to", "the", "moon"] - Last word:
"moon" - Length of last word:
4
- Trimmed string:
- For
s = "luffy is still joyboy":- Trimmed string:
"luffy is still joyboy" - Words array:
["luffy", "is", "still", "joyboy"] - Last word:
"joyboy" - Length of last word:
6
- Trimmed string:
This code handles the given constraints and ensures that we correctly find the length of the last word in any valid input string.
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