wball/PolymathREU-Walking-to-infinity-on-special-sequences
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optimizations

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This commit is contained in:
William Ball 2020-07-27 12:17:05 -07:00
parent 7343abffb2
commit d1c85455e6
2 changed files with 6 additions and 4 deletions
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2
rust/fourthfree/Cargo.toml
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@ -7,4 +7,4 @@ edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies] [dependencies]
rug = "1.10.0" rayon = "1.1"

8
rust/fourthfree/src/main.rs
View file

@ -1,7 +1,9 @@
use rayon::prelude::*;
// use std::thread; // use std::thread;
// const NUM_THREADS: usize = 12; // const NUM_THREADS: usize = 12;
const BASE: u64 = 2; const BASE: u64 = 10;
fn is_fourth_free(x: &u64) -> bool { fn is_fourth_free(x: &u64) -> bool {
let mut i = 2; let mut i = 2;
@ -25,7 +27,7 @@ fn step(x: &u64) -> Vec<u64> {
} }
fn next(ls: Vec<u64>) -> Vec<u64> { fn next(ls: Vec<u64>) -> Vec<u64> {
ls.iter().map(step).flatten().collect() ls.par_iter().map(step).flatten().collect()
} }
// fn next(ls: Vec<u64>) -> Vec<u64> { // fn next(ls: Vec<u64>) -> Vec<u64> {
@ -62,7 +64,7 @@ fn main() {
loop { loop {
i += 1; i += 1;
val += ls.len() as f64 / 2u64.pow(i) as f64; val += ls.len() as f64 / 2u64.pow(i) as f64;
ls = next(ls);
println!("{}\t{}\t{}", i, ls.len(), val); println!("{}\t{}\t{}", i, ls.len(), val);
ls = next(ls);
} }
} }