21 lines
805 B
Rust
21 lines
805 B
Rust
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use std::io::{stdin, BufRead};
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use std::iter::*;
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#[rustfmt::skip]
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fn read_input() -> Vec<i16> {
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stdin().lock().lines().next().unwrap().unwrap().chars().map(|c| c.to_string().parse().unwrap()).collect()
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}
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#[rustfmt::skip]
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fn main() {
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let mut last_phase = read_input();
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//let mut last_phase: Vec<i16> = "80871224585914546619083218645595".chars().map(|c| c.to_string().parse().unwrap()).collect();
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for _ in 0..100 {
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last_phase = (1..=last_phase.len()).map(|i| {
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let mut pattern = [0i16, 1, 0, -1].iter().flat_map(|x| repeat(x).take(i)).cycle().skip(1);
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last_phase.iter().map(|x| x*pattern.next().unwrap()).sum::<i16>().abs() % 10
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}).collect();
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}
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println!("Part 1: {}", last_phase.iter().take(8).map(|n| n.to_string()).collect::<String>());
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}
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