Add calculations for the numbers
Add calculations for right-rotate self-multiples. The calculation for the end result is still missing.master
trivernis
5 years ago
parent
4b30f6e2e2
commit
f59a401a22
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/target
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**/*.rs.bk
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.idea
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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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[[package]]
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name = "autocfg"
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version = "1.0.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "euler-168"
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version = "0.1.0"
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dependencies = [
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"num-bigint 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
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"num-integer 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
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"num-traits 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
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"num_cpus 1.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "hermit-abi"
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version = "0.1.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "libc"
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version = "0.2.66"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "num-bigint"
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version = "0.2.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"num-integer 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
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"num-traits 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "num-integer"
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version = "0.1.42"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"num-traits 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "num-traits"
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version = "0.2.11"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "num_cpus"
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version = "1.12.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"hermit-abi 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
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"libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[metadata]
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"checksum autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f8aac770f1885fd7e387acedd76065302551364496e46b3dd00860b2f8359b9d"
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"checksum hermit-abi 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "eff2656d88f158ce120947499e971d743c05dbcbed62e5bd2f38f1698bbc3772"
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"checksum libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)" = "d515b1f41455adea1313a4a2ac8a8a477634fbae63cc6100e3aebb207ce61558"
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"checksum num-bigint 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "090c7f9998ee0ff65aa5b723e4009f7b217707f1fb5ea551329cc4d6231fb304"
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"checksum num-integer 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)" = "3f6ea62e9d81a77cd3ee9a2a5b9b609447857f3d358704331e4ef39eb247fcba"
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"checksum num-traits 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "c62be47e61d1842b9170f0fdeec8eba98e60e90e5446449a0545e5152acd7096"
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"checksum num_cpus 1.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "46203554f085ff89c235cd12f7075f3233af9b11ed7c9e16dfe2560d03313ce6"
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@ -0,0 +1,13 @@
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[package]
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name = "euler-168"
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version = "0.1.0"
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authors = ["trivernis <trivernis@gmail.com>"]
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edition = "2018"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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num_cpus = "1.12.0"
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num-bigint = "0.2.6"
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num-traits = "0.2.11"
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num-integer = "0.1.42"
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use num_bigint::{BigUint, ToBigUint};
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use num_integer::Integer;
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use num_traits::ToPrimitive;
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use std::sync::mpsc::*;
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use std::ops::MulAssign;
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use std::thread;
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use std::time::Instant;
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fn main() {
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let num_threads: u64 = num_cpus::get() as u64;
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let (tx, rx) = channel::<BigUint>();
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let (sen_timing, rec_timing) = channel::<bool>();
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let end: BigUint = ubig_pow(10.to_biguint().unwrap(), 100);
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println!("Starting {} threads...", num_threads);
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for i in 0u64..num_threads {
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let tx = tx.clone();
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let sen_timing = sen_timing.clone();
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let end = end.clone();
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thread::spawn(move || {
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get_rotatable(tx, sen_timing, 10+i, end, num_threads);
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});
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println!("Started thread {}", i);
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}
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// spawns a new thread to calculate the iterations / second
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thread::spawn(move || {
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let mut last_sent = Instant::now();
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let mut iterations = 0;
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loop {
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rec_timing.recv().unwrap();
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iterations += 1;
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if last_sent.elapsed().as_secs() > 10 {
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println!("{:.2} iter/sec", iterations as f64/last_sent.elapsed().as_secs() as f64);
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last_sent = Instant::now();
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iterations = 0;
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}
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}
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});
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loop {
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println!("{}", rx.recv().unwrap());
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}
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}
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/// searches for numbers according to [euler-168](https://projecteuler.net/problem=168)
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/// the resulting numbers are sent via the tx-sender into a channel.
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/// every iteration a timing-boolean is sent in via the sen_time-sender to calculate
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/// the speed of the iterations
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fn get_rotatable(tx: Sender<BigUint>, sen_time: Sender<bool>, start: u64, end: BigUint, step: u64) {
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let mut num: BigUint = start.to_biguint().unwrap();
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let zero: BigUint = 0.to_biguint().unwrap();
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while num < end {
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let mut digits = ubig_digits(num.clone());
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digits.rotate_right(1);
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let num_rotated = ubig_from_digits(digits);
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if (num_rotated % &num) == zero {
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let _ = tx.send(num.clone());
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}
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num += step;
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let _ = sen_time.send(true);
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}
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}
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/// returns a vector containing the digits of the BigUint
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fn ubig_digits(big_number: BigUint) -> Vec<u32> {
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let mut num: BigUint = big_number;
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let mut digits: Vec<u32> = vec![];
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let zero: BigUint = 0.to_biguint().unwrap();
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let ten: BigUint = 10.to_biguint().unwrap();
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while num > zero {
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let (quot, rem) = num.div_rem(&ten);
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num = quot;
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digits.push(rem.to_u32().unwrap());
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}
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digits
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}
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/// returns a BigUint for a vector of digits
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fn ubig_from_digits(digits: Vec<u32>) -> BigUint {
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let mut num: BigUint = 0.to_biguint().unwrap();
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for (index, digit) in digits.iter().enumerate() {
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num += digit * (10 as u32).pow(index as u32);
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}
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num
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}
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/// returns ubig^exp
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fn ubig_pow(ubig: BigUint, exp: usize) -> BigUint {
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let mut num = ubig.clone();
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for _ in 0..exp {
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num.mul_assign(ubig.clone())
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}
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num
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}
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