26 lines
846 B
Rust
26 lines
846 B
Rust
#![feature(is_sorted)]
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use itertools::Itertools;
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pub fn main() {
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let (lower, upper) = (172_930, 683_082);
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let valid_part1 = (lower..upper)
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.map(|n| n.to_string().chars().collect::<Vec<_>>())
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.filter(|n| n.is_sorted())
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.filter(|v| v.clone().iter().dedup().count() != v.len());
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println!("Part 1: {}", valid_part1.clone().count());
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let part2 = valid_part1
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.filter(|vec| {
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vec.iter()
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.group_by(move |n| *n)
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.into_iter()
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.filter_map(|(_, v)| if v.count() == 2 { Some(true) } else { None })
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// can’t do this because I’m too smol brained for the borrow checker
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//.filter(|(_, v)| v.count() == 2)
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.count()
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> 0
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})
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.count();
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println!("Part 2: {}", part2);
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}
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