kageru/advent-of-code
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less mutable state rooHappy

This commit is contained in:
kageru 2019-12-07 08:29:19 +01:00
parent 45e5da75b0
commit a5e8da5baf
Signed by: kageru
GPG Key ID: 8282A2BEA4ADA3D2
1 changed files with 5 additions and 6 deletions
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11
2019/07/src/main.rs
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@ -160,8 +160,7 @@ fn execute(op: Operation, input: &mut Vec<i64>, pos: &mut i64) -> Option<i64> {
fn find_max(range: Range<i64>, input: &Vec<i64>) -> i64 {
range
.permutations(5)
.map(|amps| {
let mut last_output = 0;
.scan(0, |&mut mut acc, amps| {
let mut machines: Vec<_> = amps
.into_iter()
.map(|amp| Machine {
@ -172,13 +171,13 @@ fn find_max(range: Range<i64>, input: &Vec<i64>) -> i64 {
.collect();
for state in (0..5).cycle() {
let mut machine = machines.get_mut(state).unwrap();
machine.params.insert(0, last_output);
machine.params.insert(0, acc);
match execute_machine(&mut machine) {
Err(output) => last_output = output,
Err(output) => acc = output,
Ok(_) => break,
}
}
last_output
Some(acc)
})
.max()
.unwrap()
@ -198,7 +197,7 @@ fn execute_machine(machine: &mut Machine) -> Result<i64, i64> {
}
pub fn main() {
let input: Vec<i64> = io::stdin()
let input: Vec<_> = io::stdin()
.lock()
.lines()
.next()