26 lines
935 B
Rust
26 lines
935 B
Rust
pub fn read_file(day: usize) -> String {
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std::fs::read_to_string(std::env::var("AOC_INPUT").unwrap_or_else(|_| format!("inputs/day{day:0>2}"))).unwrap()
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}
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pub fn parse_nums(l: &str) -> Vec<usize> {
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l.lines().map(parse_num).collect()
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}
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pub fn parse_nums_comma(l: &str) -> Vec<usize> {
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l.trim().split(',').map(parse_num).collect()
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}
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#[cfg(debug_assertions)]
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pub fn parse_num<T: std::str::FromStr + std::fmt::Display>(s: &str) -> T {
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s.parse().unwrap_or_else(|_| panic!("Invalid number {s}"))
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}
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// For benchmarks.
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// This function assumes that the input will always be valid numbers and is UB otherwise
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#[cfg(not(debug_assertions))]
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pub fn parse_num<T: From<u8> + std::ops::Add<T, Output = T> + std::ops::Mul<T, Output = T>>(s: &str) -> T {
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let mut digits = s.bytes().map(|b| T::from(b - b'0'));
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let start = unsafe { digits.next().unwrap_unchecked() };
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digits.fold(start, |acc, n| acc * T::from(10) + n)
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}
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