make part1 part2
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@ -17,17 +17,12 @@ fn find_reflection<const DEVIATIONS: u32>(block: &[I]) -> Option<usize> {
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let mut offset = 0;
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let mut deviations = DEVIATIONS;
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loop {
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match try { block.get(i.checked_sub(offset)?)? ^ block.get(i + 1 + offset)? } {
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match try { (block.get(i.checked_sub(offset)?)? ^ block.get(i + 1 + offset)?).count_ones() } {
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None if deviations == 0 => return Some(i + 1),
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Some(0) => offset += 1,
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Some(diff) => {
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let diff = diff.count_ones();
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if diff > deviations {
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continue 'outer;
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} else {
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offset += 1;
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deviations -= diff;
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}
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Some(diff) if diff <= deviations => {
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offset += 1;
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deviations -= diff;
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}
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_ => continue 'outer,
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}
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@ -42,26 +37,27 @@ fn transpose(orig: &[I]) -> Vec<I> {
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let mut out = vec![0; len];
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for j in 0..len {
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for (i, &value) in orig.iter().enumerate() {
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if (value & (1 << j)) != 0 {
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out[len - 1 - j] |= 1 << (orig.len() - 1) >> i;
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}
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let src_bit = value & (1 << j);
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let dst_position = orig.len() - 1 - i;
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out[len - 1 - j] |= ((src_bit != 0) as I) << dst_position;
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}
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}
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out
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}
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fn part1(blocks: &Parsed) -> usize {
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fn solve<const DEV: u32>(blocks: &Parsed) -> usize {
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blocks
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.iter()
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.map(|block| find_reflection::<0>(block).map(|n| n * 100).or_else(|| find_reflection::<0>(&transpose(block))).unwrap())
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.map(|block| find_reflection::<DEV>(block).map(|n| n * 100).or_else(|| find_reflection::<DEV>(&transpose(block))).unwrap())
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.sum()
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}
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fn part1(blocks: &Parsed) -> usize {
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solve::<0>(blocks)
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}
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fn part2(blocks: &Parsed) -> usize {
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blocks
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.iter()
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.map(|block| find_reflection::<1>(&block).map(|n| n * 100).or_else(|| find_reflection::<1>(&transpose(&block))).unwrap())
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.sum()
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solve::<1>(blocks)
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}
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boilerplate! {
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