41 lines
1019 B
Rust
41 lines
1019 B
Rust
const ONE: u64 = 20151125;
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pub fn part_one(input: &str) -> Option<u64> {
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let l = input.len();
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let (row, column): (u32, u32) = input[80..l - 1]
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.split_once(", column ")
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.map(|(x, y)| (x.parse().unwrap(), y.parse().unwrap()))
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.unwrap();
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let n = (row + column) * (row + column - 1) / 2 - row + 1;
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let mut c = 1;
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let mut code = ONE;
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while c < n {
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code = (code * 252533) % 33554393;
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c += 1;
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}
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Some(code)
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}
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pub fn part_two(input: &str) -> Option<u32> {
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None
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}
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fn main() {
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let input = &aoc::read_file("inputs", 25);
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aoc::solve!(1, part_one, input);
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aoc::solve!(2, part_two, input);
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_part_one() {
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let input = aoc::read_file("test_inputs", 25);
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assert_eq!(part_one(&input.trim()), Some(7726640));
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}
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#[test]
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fn test_part_two() {
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let input = aoc::read_file("test_inputs", 25);
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assert_eq!(part_two(&input.trim()), None);
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}
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}
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