more cleanup and rand_select impl

This commit is contained in:
jacekpoz 2024-05-06 23:00:03 +02:00
parent d0de63ca35
commit f450688cfb
Signed by: poz
SSH key fingerprint: SHA256:JyLeVWE4bF3tDnFeUpUaJsPsNlJyBldDGV/dIKSLyN8
4 changed files with 149 additions and 17 deletions

88
lab3/rand_select/Cargo.lock generated Normal file
View file

@ -0,0 +1,88 @@
# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
[[package]]
name = "cfg-if"
version = "1.0.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
[[package]]
name = "getrandom"
version = "0.2.15"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c4567c8db10ae91089c99af84c68c38da3ec2f087c3f82960bcdbf3656b6f4d7"
dependencies = [
"cfg-if",
"libc",
"wasi",
]
[[package]]
name = "libc"
version = "0.2.154"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ae743338b92ff9146ce83992f766a31066a91a8c84a45e0e9f21e7cf6de6d346"
[[package]]
name = "libselect"
version = "0.1.0"
dependencies = [
"libsort",
"rand",
]
[[package]]
name = "libsort"
version = "0.1.0"
[[package]]
name = "ppv-lite86"
version = "0.2.17"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
[[package]]
name = "rand"
version = "0.8.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
dependencies = [
"libc",
"rand_chacha",
"rand_core",
]
[[package]]
name = "rand_chacha"
version = "0.3.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
dependencies = [
"ppv-lite86",
"rand_core",
]
[[package]]
name = "rand_core"
version = "0.6.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
dependencies = [
"getrandom",
]
[[package]]
name = "rand_select"
version = "0.1.0"
dependencies = [
"libselect",
"libsort",
]
[[package]]
name = "wasi"
version = "0.11.0+wasi-snapshot-preview1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"

View file

@ -4,3 +4,5 @@ version = "0.1.0"
edition = "2021"
[dependencies]
libselect = { path = "../../libselect" }
libsort = { path = "../../libsort" }

View file

@ -1,3 +1,59 @@
fn main() {
println!("Hello, world!");
use std::{io, process::exit};
use libselect::{randomized_select::RandomizedSelect, Select};
use libsort::{insertion_sort::InsertionSort, Sort};
fn main() -> io::Result<()> {
let mut buffer = String::new();
let stdin = io::stdin();
stdin.read_line(&mut buffer)?;
let list_len = buffer.trim().parse::<u64>().expect("array length has to be u64");
buffer.clear();
stdin.read_line(&mut buffer)?;
let order_statistic = buffer.trim().parse::<usize>().expect("order statistic has to be usize");
buffer.clear();
if !(1..=list_len as usize).contains(&order_statistic) {
eprintln!("order statistic must be in range [1..{}]", list_len);
exit(1);
}
let mut list: Vec<u64> = vec![];
for i in 0..list_len {
stdin.read_line(&mut buffer)?;
list.push(
buffer.trim().parse::<u64>()
.expect(format!("element {} has to be u64", i).as_str())
);
buffer.clear();
}
let input_list: Vec<u64> = list.clone();
let print = input_list.len() <= 50;
let mut randomized = RandomizedSelect::new(print);
let result = randomized.select_mut(&mut list, order_statistic);
if print {
println!();
println!("start state: {:?}", input_list);
println!("end state: {:?}", list);
let mut insertion = InsertionSort::new(false);
println!("sorted array: {:?}", insertion.sort(&input_list));
println!("{} order statistic: {}", order_statistic, result);
}
println!("swaps: {}", randomized.num_swap());
println!("comparisons: {}", randomized.num_comp());
Ok(())
}

View file

@ -1,6 +1,6 @@
use rand::{thread_rng, Rng};
use crate::{normal_select::NormalSelect, CompareResult, Select};
use crate::{normal_select::NormalSelect, Select};
pub struct RandomizedSelect {
comparisons: u64,
@ -10,20 +10,6 @@ pub struct RandomizedSelect {
}
impl RandomizedSelect {
fn swap(&mut self, list: &mut Vec<u64>, i: usize, j: usize) {
self.swaps += 1;
list.swap(i, j);
}
fn compare(&mut self, a: u64, b: u64) -> CompareResult {
self.comparisons += 1;
if a < b {
CompareResult::LESS
} else if a > b {
CompareResult::GREATER
} else {
CompareResult::EQUAL
}
}
fn rand_partition(&mut self, list: &mut Vec<u64>, lo: usize, hi: usize) -> usize {
let pivot = thread_rng().gen_range(lo..hi);