52 lines
1.1 KiB
Rust
52 lines
1.1 KiB
Rust
use std::collections::HashMap;
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use crate::LineResult;
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#[inline]
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fn lookup(n: usize) -> usize {
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match n {
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17 => 1,
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25 => 7,
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30 => 4,
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34 => 2,
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37 => 5,
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39 => 3,
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41 => 6,
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42 => 0,
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49 => 8,
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45 => 9,
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_ => unreachable!(),
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}
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}
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#[inline]
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#[must_use]
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pub fn unscramble(line: &str) -> LineResult {
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let mut parts = line.split('|');
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let input = parts.next().unwrap();
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let mut counts: HashMap<_, usize> = HashMap::new();
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for c in input.chars() {
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*counts.entry(c).or_default() += 1;
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}
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let digits: Vec<_> = parts
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.next()
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.unwrap()
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.trim()
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.split(' ')
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.map(|s| s.chars().map(|c| counts[&c]).sum())
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.map(lookup)
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.collect();
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LineResult {
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unique_digits: digits.iter().filter(|d| [1, 4, 7, 8].contains(d)).count(),
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number: digits
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.iter()
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.map(|&d| char::from_digit(d as u32, 10).unwrap())
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.collect::<String>()
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.parse()
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.unwrap(),
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}
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}
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