Rust: small optimization for day9 part1
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@ -381,19 +381,16 @@ mod day09 {
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use std::time::{Duration, Instant};
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use std::time::{Duration, Instant};
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fn part1(numbers: &[usize]) -> usize {
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fn part1(numbers: &[usize]) -> usize {
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for (i, &n) in numbers.iter().enumerate().skip(COUNT) {
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'outer: for (i, &n) in numbers.iter().enumerate().skip(COUNT) {
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let mut found = false;
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for x in i - COUNT..i {
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for x in i - COUNT..i {
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for y in x + 1..i {
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for y in x + 1..i {
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if numbers[x] + numbers[y] == n {
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if numbers[x] + numbers[y] == n {
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found = true;
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continue 'outer;
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}
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}
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}
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}
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}
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}
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if !found {
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return n;
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return n;
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}
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}
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}
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panic!();
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panic!();
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@ -416,7 +413,8 @@ mod day09 {
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}
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}
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}
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}
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numbers[lower..upper].iter().min().unwrap() + numbers[lower..upper].iter().max().unwrap()
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let slice = &numbers[lower..upper];
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slice.iter().min().unwrap() + slice.iter().max().unwrap()
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}
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}
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const COUNT: usize = 25;
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const COUNT: usize = 25;
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