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Use Hermann Bottenbruch's binary search #9

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Merged
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Feb 2, 2025
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Use Hermann Bottenbruch's binary search #9

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9 changes: 4 additions & 5 deletions src/year2019/day14.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -79,16 +79,15 @@ pub fn part1(input: &[Reaction]) -> u64 {
/// Find the maximum amount of fuel possible from 1 trillion ore with an efficient binary search.
pub fn part2(input: &[Reaction]) -> u64 {
let threshold = 1_000_000_000_000;
let mut start = 1;
let mut start = 1_u64;
let mut end = threshold;

while start < end {
let middle = (start + end) / 2;
while start != end {
let middle = (start + end).div_ceil(2);

match ore(input, middle).cmp(&threshold) {
Ordering::Less => start = middle + 1,
Ordering::Equal => return middle,
Ordering::Greater => end = middle - 1,
_ => start = middle,
}
}

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