# 22.06.2025 [2138. Divide a String Into Groups of Size k]

Описание: 22.06.2025
[2138. Divide a String Into Groups of Size k](https://leetcode.com/problems/divide-...) easy
[blog post](https://leetcode.com/problems/divide-...)
[substack](https://open.substack.com/pub/dmitrii...)
[youtube](   • # 22.06.2025 [2138. Divide a String Into G...  )

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https://t.me/leetcode_daily_unstoppab...

#### Problem TLDR

k-chunked string, filled tail #easy

#### Intuition

Pad then chunk, or chunk then pad. Prefill everything, or write a precise filling code. Great task to learn the language built-ins.

#### Approach

if you know Kotlin `padEnd` & `chunked` you don't have to think
Rust doesn't allow `fmt` with dynamic fill character
`1 + (size - 1) / k` or `(k + size - 1) / k` will pad to `% k`
Kotln / Java `String` has `CharArray` constructor arguments
Rust has `resize` to pad-fill a `Vec`

#### Complexity

Time complexity:
$$O(n)$$

Space complexity:
$$O(n)$$

#### Code
https://dmitrysamoylenko.com/2023/07/...