johannes/advent-of-rust-2024
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fixed day 7 concat operator where rhs is 10^x

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Johannes
2024-12-08 18:12:12 +01:00
parent d1f49d204f
commit b987f56e5d
1 changed files with 2 additions and 1 deletions
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src/day07.rs
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@@ -98,7 +98,7 @@ fn well(expected: i64, acc: i64, operands: &[i64]) -> bool {
} }
fn concat(lhs: i64, rhs: i64) -> i64 { fn concat(lhs: i64, rhs: i64) -> i64 {
let exp: u32 = (rhs as f64).log10().ceil() as u32; let exp: u32 = (rhs as f64 + 1.0).log10().ceil() as u32;
let shift = 10i64.pow(exp); let shift = 10i64.pow(exp);
lhs * shift + rhs lhs * shift + rhs
} }
@@ -130,5 +130,6 @@ mod test {
#[test] #[test]
fn test_concat() { fn test_concat() {
assert_eq!(1234, concat(12, 34)); assert_eq!(1234, concat(12, 34));
assert_eq!(1210, concat(12, 10));
} }
} }