Решение на упр.02 задача 3 от Божидар Виденов

Обратно към всички решения

Към профила на Божидар Виденов

Код

fn split_string_at(s: String, n: usize) -> (String, String) {

let mut s_chars = s.chars();

let mut i = 1;

let mut s1 = String::new();

let mut s2 = String::new();

while let Some(s) = s_chars.next() {

if i <= n {

s1.push(s);

} else {

s2.push(s);

}

i += 1;

}

return (s1, s2);

}

fn split_slice_at<'a>(s: &'a str, n: usize) -> (&'a str, &'a str) {

let mut s_char_indices = s.char_indices();

let mut i = 0;

let mut n_in_bytes = 0;

while let Some((curr_byte_idx, _)) = s_char_indices.next() {

if i == n {

n_in_bytes = curr_byte_idx;

break;

}

i += 1;

}

if i > n_in_bytes {

n_in_bytes = i;

}

return (&s[0..n_in_bytes], &s[n_in_bytes..]);

}

// Може да се имплементира ако връщаме String вместо &str. Това означава, че създаваме новите

// низове. Можем да използваме резултата така:

// let (mut s1, mut s2) = split_slice_mut_at(&mut s, 3);

fn split_slice_mut_at(s: &mut str, n: usize) -> (String, String) {

let mut s_chars = s.chars();

let mut i = 1;

let mut s1 = String::new();

let mut s2 = String::new();

while let Some(s) = s_chars.next() {

if i <= n {

s1.push(s);

} else {

s2.push(s);

}

i += 1;

}

return (s1, s2);

}

Лог от изпълнението

Updating crates.io index
     Locking 17 packages to latest compatible versions
   Compiling proc-macro2 v1.0.102
   Compiling quote v1.0.41
   Compiling unicode-ident v1.0.20
   Compiling futures-sink v0.3.31
   Compiling futures-core v0.3.31
   Compiling futures-channel v0.3.31
   Compiling memchr v2.7.6
   Compiling syn v2.0.108
   Compiling pin-project-lite v0.2.16
   Compiling futures-task v0.3.31
   Compiling futures-io v0.3.31
   Compiling pin-utils v0.1.0
   Compiling slab v0.4.11
   Compiling solution v0.1.0 (/tmp/d20251023-1757769-ej0cm2/solution)
warning: function `split_string_at` is never used
 --> src/lib.rs:1:4
  |
1 | fn split_string_at(s: String, n: usize) -> (String, String) {
  |    ^^^^^^^^^^^^^^^
  |
  = note: `#[warn(dead_code)]` on by default

warning: function `split_slice_at` is never used
  --> src/lib.rs:17:4
   |
17 | fn split_slice_at<'a>(s: &'a str, n: usize) -> (&'a str, &'a str) {
   |    ^^^^^^^^^^^^^^

warning: function `split_slice_mut_at` is never used
  --> src/lib.rs:39:4
   |
39 | fn split_slice_mut_at(s: &mut str, n: usize) -> (String,  String) {
   |    ^^^^^^^^^^^^^^^^^^

warning: `solution` (lib) generated 3 warnings
   Compiling futures-macro v0.3.31
   Compiling futures-util v0.3.31
   Compiling futures-executor v0.3.31
   Compiling futures v0.3.31
warning: function `split_slice_mut_at` is never used
  --> tests/../src/lib.rs:39:4
   |
39 | fn split_slice_mut_at(s: &mut str, n: usize) -> (String,  String) {
   |    ^^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default

warning: `solution` (test "solution_test") generated 1 warning
    Finished `test` profile [unoptimized + debuginfo] target(s) in 13.59s
     Running tests/solution_test.rs (target/debug/deps/solution_test-fc1324dc0157cdc7)

running 1 test
test solution_test::test_basic ... ok

test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

История (2 версии и 0 коментара)

Божидар качи решение на 16.10.2025 20:05 (преди 14 дена)

fn split_string_at(s: String, n: usize) -> (String, String) {

let mut s_chars = s.chars();

let mut i = 1;

let mut s1 = String::new();

let mut s2 = String::new();

while let Some(s) = s_chars.next() {

if i <= n {

s1.push(s);

} else {

s2.push(s);

}

i += 1;

}

return (s1, s2);

}

fn split_slice_at<'a>(s: &'a str, n: usize) -> (&'a str, &'a str) {

- let mut s_char_indices = s.char_indices();

+let mut s_char_indices = s.char_indices();

let mut i = 0;

let mut n_in_bytes = 0;

while let Some((curr_byte_idx, _)) = s_char_indices.next() {

if i == n {

n_in_bytes = curr_byte_idx;

+ break;

}

i += 1;

+ }

+ if i > n_in_bytes {

+ n_in_bytes = i;

}

return (&s[0..n_in_bytes], &s[n_in_bytes..]);

}

// Може да се имплементира ако връщаме String вместо &str. Това означава, че създаваме новите

// низове. Можем да използваме резултата така:

// let (mut s1, mut s2) = split_slice_mut_at(&mut s, 3);

fn split_slice_mut_at(s: &mut str, n: usize) -> (String, String) {

let mut s_chars = s.chars();

let mut i = 1;

let mut s1 = String::new();

let mut s2 = String::new();

while let Some(s) = s_chars.next() {

if i <= n {

s1.push(s);

} else {

s2.push(s);

}

i += 1;

}

return (s1, s2);

}