26 lines
828 B
Rust
26 lines
828 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) = (172930, 683082);
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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(|v| {
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let (mut last, mut streak, mut double) = (' ', 0, false);
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v.iter().for_each(|c| {
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if streak == 2 && c != &last {
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double = true
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}
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streak = if c == &last { streak + 1 } else { 1 };
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last = *c;
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});
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double || streak == 2
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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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