Решение на Дигитален корен от Антонио Миндов

Обратно към всички решения

Към профила на Антонио Миндов

Код

pub fn decimal(input: &str) -> Option<u32> {

digital_root(input, 10)

}

pub fn hex(input: &str) -> Option<u32> {

digital_root(input, 16)

}

pub fn octal(input: &str) -> Option<u32> {

digital_root(input, 8)

}

pub fn binary(input: &str) -> Option<u32> {

digital_root(input, 2)

}

fn to_base(numb: u32, base: u32) -> String {

match base {

2 => format!("{:b}", numb),

8 => format!("{:o}", numb),

10 => numb.to_string(),

16 => format!("{:x}", numb),

_ => panic!("What do you mean you want it in that base???")

В безсмъртните думи на Ruststreet Boys:

🎵 Tell me why 🎵
Ain't nothin' but an `unsafe`
🎵 Tell me why 🎵
Ain't nothin' but a mistake
🎵 Tell me why 🎵
I never wanna hear you say
"I want it in that base"

Андрей коментира преди почти 6 години

The classics ;)

Антонио Миндов коментира преди почти 6 години

}

}

fn add_optionals(a: Option<u32>, b: Option<u32>) -> Option<u32> {

a.and_then(|a| b.map(|b| a + b))

}

fn digital_root(input: &str, base: u32) -> Option<u32> {

let result = input.chars().map(|c| c.to_digit(base))

.fold(Some(0), add_optionals);

result.map( |res| to_base(res, base))

.filter( |input| input.len() > 1)

.and_then(|input| digital_root(&input[..], base))

.or(result)

}

Лог от изпълнението

Compiling solution v0.1.0 (/tmp/d20200111-2173579-qi19ru/solution)
    Finished test [unoptimized + debuginfo] target(s) in 1.77s
     Running target/debug/deps/solution-a73e64ec87929bd0

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out

     Running target/debug/deps/solution_test-38971695424b36d5

running 6 tests
test solution_test::test_binary ... ok
test solution_test::test_decimal_basic ... ok
test solution_test::test_hex_basic ... ok
test solution_test::test_invalid ... ok
test solution_test::test_octal_basic ... ok
test solution_test::test_zeroes ... ok

test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out

   Doc-tests solution

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out

История (1 версия и 3 коментара)