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trick #6

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4 changes: 2 additions & 2 deletions src/day9.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@ unsafe fn inner1(s: &[u8]) -> usize {
macro_rules! insert_file {
($len:expr, $id:expr) => {
let len = $len;
checksum += (disk_pos * 2 + len - 1) * $id * len / 2;
checksum += (disk_pos * 2 + len - 1) * $id * len;
disk_pos += len;
};
}
Expand Down Expand Up @@ -50,7 +50,7 @@ unsafe fn inner1(s: &[u8]) -> usize {

insert_file!(rem_src, left);

checksum
checksum / 2
}

pub fn part1(s: &str) -> impl Display {
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