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2015: day04: optimize string allocations

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This commit is contained in:
Antoine Martin 2019-12-03 15:22:25 +01:00
parent ce83c56841
commit 33b89f6269
1 changed files with 6 additions and 4 deletions
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10
aoc2015/src/day04.rs
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@ -13,15 +13,17 @@ pub fn run() -> Result<()> {
fn part1(input: &str) -> Result<u64> { fn part1(input: &str) -> Result<u64> {
let input = input.trim_end(); let input = input.trim_end();
let mut content = String::from(input);
let mut hasher = Md5::new(); let mut hasher = Md5::new();
for i in 0.. { for i in 0.. {
let content = format!("{}{}", input, i); content.truncate(input.len());
content.extend(i.to_string().chars());
hasher.input(content); hasher.input(&content);
let res = format!("{:x}", hasher.result_reset()); let res = hasher.result_reset();
if &res[..5] == "00000" { if &res[..2] == &[0, 0] && res[2] <= 0x0f {
return Ok(i); return Ok(i);
} }
} }