aoc/year2017/
day09.rs

1//! # Stream Processing
2//!
3//! Computes both parts in a single pass.
4type Input = (u32, u32);
5
6pub fn parse(input: &str) -> Input {
7    let mut iter = input.bytes();
8    let mut groups = 0;
9    let mut depth = 1;
10    let mut characters = 0;
11
12    while let Some(b) = iter.next() {
13        match b {
14            b'<' => {
15                // Inner loop for garbage.
16                while let Some(b) = iter.next() {
17                    match b {
18                        b'!' => {
19                            iter.next();
20                        }
21                        b'>' => break,
22                        _ => characters += 1,
23                    }
24                }
25            }
26            b'{' => {
27                groups += depth;
28                depth += 1;
29            }
30            b'}' => {
31                depth -= 1;
32            }
33            _ => (),
34        }
35    }
36
37    (groups, characters)
38}
39
40pub fn part1(input: &Input) -> u32 {
41    input.0
42}
43
44pub fn part2(input: &Input) -> u32 {
45    input.1
46}
aoc/year2017/day09.rs

aoc/year2017/
day09.rs
