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2019: day04: parse input once

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This commit is contained in:
Antoine Martin 2019-12-07 02:15:21 +01:00
parent 3fd8cd924d
commit d621d80bac
1 changed files with 29 additions and 24 deletions
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53
aoc2019/src/day04.rs
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@ -8,23 +8,29 @@ const INPUT: &str = include_str!("../input/day04.txt");
pub fn run() -> Result<String> {
let mut res = String::with_capacity(128);
writeln!(res, "part 1: {}", part1(INPUT)?)?;
writeln!(res, "part 2: {}", part2(INPUT)?)?;
let (begin, end) = range(INPUT)?;
writeln!(res, "part 1: {}", part1(begin, end)?)?;
writeln!(res, "part 2: {}", part2(begin, end)?)?;
Ok(res)
}
fn part1(input: &str) -> Result<usize> {
fn range(input: &str) -> Result<(usize, usize)> {
let mut range = input.trim_end().split('-');
let begin: usize = range
let begin = range
.next()
.ok_or_else(|| err!("invalid input: {}", input))?
.parse()?;
let end: usize = range
let end = range
.next()
.ok_or_else(|| err!("invalid input: {}", input))?
.parse()?;
Ok((begin, end))
}
fn part1(begin: usize, end: usize) -> Result<usize> {
let mut digits = Vec::with_capacity(10);
let mut res = 0;
for n in begin..=end {
@ -41,17 +47,7 @@ fn part1(input: &str) -> Result<usize> {
Ok(res)
}
fn part2(input: &str) -> Result<usize> {
let mut range = input.trim_end().split('-');
let begin: usize = range
.next()
.ok_or_else(|| err!("invalid input: {}", input))?
.parse()?;
let end: usize = range
.next()
.ok_or_else(|| err!("invalid input: {}", input))?
.parse()?;
fn part2(begin: usize, end: usize) -> Result<usize> {
let mut res = 0;
let mut digits = Vec::with_capacity(10);
@ -126,25 +122,34 @@ mod tests {
#[test]
fn part1_provided() {
assert_eq!(part1("111111-111111").unwrap(), 1);
assert_eq!(part1("223450-223450").unwrap(), 0);
assert_eq!(part1("123789-123789").unwrap(), 0);
let (begin, end) = range("111111-111111").unwrap();
println!("{}, {}", begin, end);
assert_eq!(part1(begin, end).unwrap(), 1);
let (begin, end) = range("223450-223450").unwrap();
assert_eq!(part1(begin, end).unwrap(), 0);
let (begin, end) = range("123789-123789").unwrap();
assert_eq!(part1(begin, end).unwrap(), 0);
}
#[test]
fn part1_real() {
assert_eq!(part1(INPUT).unwrap(), 1729);
let (begin, end) = range(INPUT).unwrap();
assert_eq!(part1(begin, end).unwrap(), 1729);
}
#[test]
fn part2_provided() {
assert_eq!(part2("112233-112233").unwrap(), 1);
assert_eq!(part2("123444-123444").unwrap(), 0);
assert_eq!(part2("111122-111122").unwrap(), 1);
let (begin, end) = range("112233-112233").unwrap();
assert_eq!(part2(begin, end).unwrap(), 1);
let (begin, end) = range("123444-123444").unwrap();
assert_eq!(part2(begin, end).unwrap(), 0);
let (begin, end) = range("111122-111122").unwrap();
assert_eq!(part2(begin, end).unwrap(), 1);
}
#[test]
fn part2_real() {
assert_eq!(part2(INPUT).unwrap(), 1172);
let (begin, end) = range(INPUT).unwrap();
assert_eq!(part2(begin, end).unwrap(), 1172);
}
}