59 lines
1.1 KiB
Rust
59 lines
1.1 KiB
Rust
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use crate::prelude::*;
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pub type I = Vec<(usize, usize)>;
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pub type O = usize;
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fn _parse (data: &str) -> I {
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data.lines()
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.map(|e| e.trim().trim_matches('.')
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.split_once(" has ")
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.map(|(_, r)|
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r.split_once(" positions; at time=0, it is at position ")
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.map(|(n, p)| (n.parse().unwrap(), p.parse().unwrap()))
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)
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.flatten()
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.unwrap()
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)
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.collect()
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}
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fn _solve (data: &I) -> O {
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let d = |time, (size, position)| (time + position) % size == 0;
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(0..).into_iter().find(|t| data.iter().enumerate().all(|(i, &df)| d(t + i + 1, df))).unwrap()
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}
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fn _silver (data: I) -> O {
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_solve(&data)
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}
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fn _gold (mut data: I) -> O {
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data.push((11, 0));
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_solve(&data)
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}
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#[cfg(test)]
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mod test {
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use super::*;
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fn read () -> I {
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let data = inc!(15);
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_parse(data)
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}
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#[test]
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fn silver () {
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let data = read();
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let ans = _silver(data);
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assert_eq!(ans, 122318)
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}
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#[test]
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fn gold () {
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let data = read();
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let ans = _gold(data);
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assert_eq!(ans, 3208583)
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}
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}
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