https://github.com/twil3akine/keta

A lightweight, zero-dependency Rust crate for digit operations (decomposition, sum, reverse, radix support), designed for competitive programming.
https://github.com/twil3akine/keta

algorithm atcoder competitive-programming digits math rust zero-dependency

Last synced: 13 days ago
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A lightweight, zero-dependency Rust crate for digit operations (decomposition, sum, reverse, radix support), designed for competitive programming.

• Host: GitHub
• URL: https://github.com/twil3akine/keta
• Owner: Twil3akine
• License: mit
• Created: 2026-01-03T15:56:28.000Z (24 days ago)
• Default Branch: master
• Last Pushed: 2026-01-05T13:30:28.000Z (22 days ago)
• Last Synced: 2026-01-13T19:45:56.404Z (14 days ago)
• Topics: algorithm, atcoder, competitive-programming, digits, math, rust, zero-dependency
• Language: Rust
• Homepage: https://crates.io/crates/keta
• Size: 23.4 KB
• Stars: 0
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Keta

A lightweight, zero-dependency Rust crate for digit operations, designed for competitive programming (AtCoder, etc.).

[![Crates.io](https://img.shields.io/crates/v/keta.svg)](https://crates.io/crates/keta)

[![Documentation](https://docs.rs/keta/badge.svg)](https://docs.rs/keta)

[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)

## Features

- **Zero Dependencies**: Depends only on `std`. Fast compile times.

- **Digit Manipulation**: Easily decompose numbers into digits (`digits()`), sum them (`digit_sum()`), or reverse them (`reverse()`).

- **Radix Support**: Handle binary, octal, hexadecimal, or any base-N operations (`digits_radix(2)`).

- **Useful Utilities**: Product of digits (`digit_product()`), check digit existence (`contains_digit()`), or rearrange digits (`make_max()`, `make_min()`).

- **Competitive Programming Ready**: Optimized for speed, perfect for problems involving digit sums, palindromes, or base conversion.

## Installation

Add this to your `Cargo.toml`:

```toml

[dependencies]

keta = "0.3.3"

```

## Usage

```rust

use keta::Keta;

fn main() {

    // 1. Decomposition (Decimal & Radix)

    let n = 12345;

    assert_eq!(n.digits(), vec![1, 2, 3, 4, 5]);

    assert_eq!(6.digits_radix(2), vec![1, 1, 0]); // 6 in binary is 110

    // 2. Aggregation (Sum & Product)

    assert_eq!(n.digit_sum(), 15);        // 1+2+3+4+5 = 15

    assert_eq!(123.digit_product(), 6);   // 1*2*3 = 6

    assert_eq!(6.digit_sum_radix(2), 2);  // 1+1+0 = 2

    // 3. Rearrangement & Properties

    assert_eq!(2026.make_max(), 6220);

    assert_eq!(2026.make_min(), 226);

    assert!(12345.contains_digit(3));

    assert!(12321.is_palindrome());

    assert_eq!(n.reverse(), 54321);

}

```

## License

This project is licensed under the [MIT LICENSE](LICENSE).