wball/PolymathREU-Walking-to-infinity-on-special-sequences
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check for duplicates in fourthfree

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This commit is contained in:
William Ball 2020-07-24 13:50:52 -07:00
parent 2a9682aeab
commit e6d61cbf1b
1 changed files with 4 additions and 3 deletions
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7
rust/fourthfree/src/main.rs
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@ -1,5 +1,6 @@
use rug::{Assign, Integer}; use rug::{Assign, Integer};
use std::thread; use std::thread;
use std::collections::HashSet;
const NUM_THREADS: usize = 12; const NUM_THREADS: usize = 12;
const BASE: u64 = 10; const BASE: u64 = 10;
@ -19,15 +20,15 @@ fn is_fourth_free(x: &Integer) -> bool {
} }
fn step(x: &Integer) -> Vec<Integer> { fn step(x: &Integer) -> Vec<Integer> {
let mut new_xs = Vec::new(); let mut new_xs: HashSet<Integer> = HashSet::new();
for d in 0..BASE { for d in 0..BASE {
let mut temp = Integer::from(x * BASE); let mut temp = Integer::from(x * BASE);
temp += d; temp += d;
if is_fourth_free(&temp) { if is_fourth_free(&temp) {
new_xs.push(temp); new_xs.insert(temp);
} }
} }
new_xs new_xs.iter().cloned().collect()
} }
fn next(ls: &Vec<Integer>) -> Vec<Integer> { fn next(ls: &Vec<Integer>) -> Vec<Integer> {