# 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](/files/w6lACbjbjn46vODaOTH6)

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


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://leetcode.realtemirov.uz/problems/58.-length-of-last-word.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.