49 lines
1.3 KiB
Rust
49 lines
1.3 KiB
Rust
use std::{cmp::max, fs::File, io::{self, BufRead, BufReader}};
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fn parse_range(s: &str) -> (u64, u64) {
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let (s1, s2) = s.split_once('-').unwrap();
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(s1.parse().unwrap(), s2.parse().unwrap())
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}
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fn main() -> Result<(), io::Error> {
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let f = File::open("5-input.txt")?;
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let reader = BufReader::new(f);
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let mut lines = reader.lines().map_while(Result::ok);
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let mut ranges: Vec<_> = lines
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.by_ref()
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.take_while(|l| !l.is_empty())
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.map(|l| parse_range(&l))
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.collect();
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ranges.sort_unstable();
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let mut ids: Vec<u64> = lines
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.map(|l| l.parse::<u64>().unwrap())
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.collect();
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ids.sort_unstable();
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let mut total = 0;
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// let mut range_idx = 0;
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// let mut id_idx = 0;
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// while id_idx < ids.len() && range_idx < ranges.len() {
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// let (low, high) = ranges[range_idx];
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// if ids[id_idx] < low {
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// id_idx += 1;
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// } else if ids[id_idx] <= high {
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// id_idx += 1;
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// total += 1;
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// } else {
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// range_idx += 1;
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// }
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// }
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let mut max_seen = 0;
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for (low, high) in ranges {
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let new_low = max(low, max_seen + 1);
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max_seen = max(high, max_seen);
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total += 1 + max_seen - new_low;
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}
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println!("Result {}", total);
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Ok(())
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} |