Решение на упр.04 задача 2 от Димитър Николов
Към профила на Димитър Николов
Резултати
- 2 точки от тестове
- 0 бонус точки
- 2 точки общо
- 4 успешни тест(а)
- 0 неуспешни тест(а)
Код
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum CompareResult {
Less,
Equal,
Greater,
}
trait Compare {
fn compare(&self, other: &Self) -> CompareResult;
}
trait Filter {
fn matches(&self, query: &str) -> bool;
}
trait Aggregate {
type Output;
fn aggregate(items: &[Self]) -> Self::Output
where
Self: Sized;
}
fn sort<T: Compare + Clone>(mut items: Vec<T>, sort_order: SortOrder) -> Vec<T> {
for i in 0..items.len() {
let mut swap_idx = i;
for j in (i + 1)..items.len() {
let comparison = items[j].compare(&items[swap_idx]);
if (comparison == CompareResult::Less && sort_order == SortOrder::Asc)
|| (comparison == CompareResult::Greater && sort_order == SortOrder::Desc)
{
swap_idx = j;
}
}
let tmp = items[swap_idx].clone();
items[swap_idx] = items[i].clone();
items[i] = tmp;
}
items
}
fn process_items<T>(items: Vec<T>, query: &str, order: SortOrder) -> (Vec<T>, T::Output)
where
T: Compare + Filter + Aggregate + Clone,
{
let items = items
.into_iter()
.filter(|book| book.matches(query))
.collect::<Vec<T>>();
let aggregate = T::aggregate(&items);
(sort(items, order), aggregate)
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum SortOrder {
Desc,
Asc,
}
#[derive(Clone)]
struct Book {
title: String,
author: String,
year: u32,
rating: f32,
}
impl Compare for u32 {
fn compare(&self, other: &Self) -> CompareResult {
if self > other {
CompareResult::Greater
} else if self < other {
CompareResult::Less
} else {
CompareResult::Equal
}
}
}
impl Compare for Book {
fn compare(&self, other: &Self) -> CompareResult {
self.year.compare(&other.year)
}
}
impl Filter for Book {
fn matches(&self, query: &str) -> bool {
self.title.contains(query) || self.author.contains(query)
}
}
impl Aggregate for Book {
type Output = f32;
fn aggregate(items: &[Self]) -> Self::Output
where
Self: Sized,
{
if items.is_empty() {
return 0.0f32;
}
items.iter().map(|book| book.rating).sum::<f32>() / items.len() as f32
}
}
Лог от изпълнението
Updating crates.io index
Locking 17 packages to latest compatible versions
Compiling proc-macro2 v1.0.103
Compiling unicode-ident v1.0.22
Compiling quote v1.0.41
Compiling futures-core v0.3.31
Compiling futures-sink v0.3.31
Compiling futures-channel v0.3.31
Compiling slab v0.4.11
Compiling futures-io v0.3.31
Compiling syn v2.0.109
Compiling pin-project-lite v0.2.16
Compiling futures-task v0.3.31
Compiling pin-utils v0.1.0
Compiling memchr v2.7.6
Compiling solution v0.1.0 (/tmp/d20251106-1757769-1dhlth7/solution)
warning: enum `CompareResult` is never used
--> src/lib.rs:2:6
|
2 | enum CompareResult {
| ^^^^^^^^^^^^^
|
= note: `#[warn(dead_code)]` on by default
warning: trait `Compare` is never used
--> src/lib.rs:8:7
|
8 | trait Compare {
| ^^^^^^^
warning: trait `Filter` is never used
--> src/lib.rs:12:7
|
12 | trait Filter {
| ^^^^^^
warning: trait `Aggregate` is never used
--> src/lib.rs:16:7
|
16 | trait Aggregate {
| ^^^^^^^^^
warning: function `sort` is never used
--> src/lib.rs:23:4
|
23 | fn sort<T: Compare + Clone>(mut items: Vec<T>, sort_order: SortOrder) -> Vec<T> {
| ^^^^
warning: function `process_items` is never used
--> src/lib.rs:44:4
|
44 | fn process_items<T>(items: Vec<T>, query: &str, order: SortOrder) -> (Vec<T>, T::Output)
| ^^^^^^^^^^^^^
warning: enum `SortOrder` is never used
--> src/lib.rs:57:6
|
57 | enum SortOrder {
| ^^^^^^^^^
warning: struct `Book` is never constructed
--> src/lib.rs:63:8
|
63 | struct Book {
| ^^^^
warning: `solution` (lib) generated 8 warnings
Compiling futures-macro v0.3.31
Compiling futures-util v0.3.31
Compiling futures-executor v0.3.31
Compiling futures v0.3.31
Finished `test` profile [unoptimized + debuginfo] target(s) in 8.81s
Running tests/solution_test.rs (target/debug/deps/solution_test-8c2c5f784503f204)
running 4 tests
test solution_test::test_aggregate ... ok
test solution_test::test_compare ... ok
test solution_test::test_matches ... ok
test solution_test::test_process ... ok
test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s