> For the complete documentation index, see [llms.txt](https://leetcode.realtemirov.uz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://leetcode.realtemirov.uz/problems/58.-length-of-last-word.md).

# 58. Length of Last Word

🟩 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` consisting of non-space characters only.

Example 1:

Input: Output: 5 Explanation: Example 2:

Input: Output: 4 Explanation: Example 3:

Input: Output: 6 Explanation:

Constraints:

## 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 <= 10^4`
* `s` consists of only English letters and spaces `' '`.
* There will be at least one word in `s`.

## Solution

My Solution

```go
func lengthOfLastWord(s string) int {
    cnt := 0
    existEmpty := false
    for _, v := range s {
        if v == ' ' {
            existEmpty = true
        } else {
            if existEmpty {
                cnt = 0
                existEmpty = false
            }
            cnt++
        }
    }

    return cnt
}
```

Optimal solution

```go
func lengthOfLastWord(s string) int {
    length := 0
    i := len(s) - 1

    // Ignore trailing spaces
    for i >= 0 && s[i] == ' ' {
        i--
    }

    // Count the length of the last word
    for i >= 0 && s[i] != ' ' {
        length++
        i--
    }

    return length
}
```

![result](https://600345290-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FrSK2xH3txU3tYyDsT8mQ%2Fuploads%2Fgit-blob-0c75eead5ac1dbcdb1735fc25092b51b4e0ad012%2F58.png?alt=media)

Leetcode: [link](https://leetcode.com/problems/length-of-last-word/description)