53 lines
1.4 KiB
Rust
53 lines
1.4 KiB
Rust
---cargo
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---
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static CONTENT: &'static str = include_str!("./inputs/02_1.txt");
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fn main() {
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let ranges: Vec<_> = CONTENT.split(',').map(|l| l.trim()).filter(|l| !l.is_empty()).map(|l| {
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let (raw_start, raw_end) = l.split_once('-').unwrap();
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let start: usize = raw_start.parse().unwrap();
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let end: usize = raw_end.parse().unwrap();
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start..=end
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}).collect();
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println!("Ranges: {:?}", ranges);
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let mut result = 0;
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for r in ranges.iter() {
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for v in r.clone() {
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let v_len = v.ilog10() + 1;
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let mut iter = (1..=v_len/2).filter_map(|len| {
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if v_len % len != 0 {
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return None;
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}
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let mut seqs = (0..v_len/len).map(|i| {
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let offset = 10_usize.pow(i*len);
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let mask = 10_usize.pow(len);
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(v/offset) % mask
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});
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let first = match seqs.next() {
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Some(f) => f,
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None => return None,
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};
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let invalid = seqs.all(|s| s == first);
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invalid.then_some((first, len, v_len/len))
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});
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let first = iter.next();
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if first.is_some() {
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println!("{} - {:?}", v, first);
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result += v;
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}
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}
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}
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println!("Result: {}", result);
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}
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