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2020: day25: pick smallest loop size

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This commit is contained in:
Antoine Martin 2020-12-25 22:13:57 +01:00
parent 7249045d0c
commit 44c2536b72
1 changed files with 9 additions and 2 deletions
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11
aoc2020/src/day25.rs
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@ -48,10 +48,17 @@ fn part1(input: &str) -> Result<u64> {
.parse()?; .parse()?;
let card_loop_size = find_loop_size(card_pub_key); let card_loop_size = find_loop_size(card_pub_key);
let door_loop_size = find_loop_size(door_pub_key);
let (loop_size, pub_key) = if card_loop_size < door_loop_size {
(card_loop_size, door_pub_key)
} else {
(door_loop_size, card_pub_key)
};
let mut encryption_key = 1; let mut encryption_key = 1;
for _ in 0..card_loop_size { for _ in 0..loop_size {
encryption_key = transform(encryption_key, door_pub_key); encryption_key = transform(encryption_key, pub_key);
} }
Ok(encryption_key) Ok(encryption_key)