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2020: day01: linear part 1

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Antoine Martin 2020-12-01 17:54:44 +01:00
parent 14756db40a
commit c09ce94f6a
1 changed files with 8 additions and 7 deletions
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15
aoc2020/src/day01.rs
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@ -37,14 +37,15 @@ fn part2(input: &str) -> Result<i64> {
} }
fn find_2020_2_sum(entries: &[i64]) -> Result<(i64, i64)> { fn find_2020_2_sum(entries: &[i64]) -> Result<(i64, i64)> {
let set: HashSet<i64> = entries.iter().copied().collect();
for i in 0..entries.len() { for i in 0..entries.len() {
for j in 0..entries.len() { let a = entries[i];
if i == j {
continue; let b = 2020 - a;
}
if entries[i] + entries[j] == 2020 { if set.contains(&b) {
return Ok((entries[i], entries[j])); return Ok((a, b));
}
} }
} }