65 lines
1.3 KiB
Rust
65 lines
1.3 KiB
Rust
use crate::LineResult;
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const FREQ_TABLE: [usize; 256] = {
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let mut tab = [0; 256];
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tab[17] = 1;
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tab[25] = 7;
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tab[30] = 4;
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tab[34] = 2;
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tab[37] = 5;
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tab[39] = 3;
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tab[41] = 6;
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tab[42] = 0;
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tab[45] = 9;
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tab[49] = 8;
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tab
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};
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#[must_use]
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#[inline]
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pub fn unscramble(line: &str) -> LineResult {
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let mut bytes = line.bytes();
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let mut counts = [0; 7];
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loop {
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match bytes.next().unwrap() {
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c @ b'a'..=b'g' => {
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counts[c as usize - b'a' as usize] += 1;
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}
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b'|' => break,
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_ => {}
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}
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}
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bytes.next();
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let mut freq = 0;
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let mut unique_digits = 0;
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let mut number = 0;
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loop {
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let c = bytes.next();
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match c {
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Some(b' ') | None => {
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let digit = FREQ_TABLE[freq & 0xff];
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if [1, 4, 7, 8].contains(&digit) {
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unique_digits += 1;
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}
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number = number * 10 + digit;
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freq = 0;
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if c.is_none() {
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break;
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}
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}
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Some(c @ b'a'..=b'g') => {
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freq += counts[c as usize - b'a' as usize];
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},
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Some(_) => {}
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}
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}
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LineResult {
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unique_digits,
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number,
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}
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}
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