advent-of-code/2019/04/src/main.rs

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#![feature(is_sorted)]
use itertools::Itertools;
pub fn main() {
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let valid_part1 = (172_930..683_082)
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.map(|n| n.to_string().chars().collect::<Vec<_>>())
.filter(|n| n.is_sorted())
.filter(|v| v.clone().iter().dedup().count() != v.len());
println!("Part 1: {}", valid_part1.clone().count());
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let part2 = valid_part1.filter(|vec| {
vec.iter()
.group_by(move |n| *n)
.into_iter()
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.fold(false, |acc, (_, v)| acc || v.count() == 2)
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});
println!("Part 2: {}", part2.count());
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}