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Implement day 21.

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Bert Peters
2018-12-21 13:54:12 +01:00
parent 92e305db46
commit 71c18e44e1
4 changed files with 78 additions and 28 deletions
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4
2018/benches/days.rs
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@@ -72,8 +72,10 @@ day_bench!(day17, 17);
day_bench!(day18, 18);
day_bench!(day19, 19);
day_bench!(day20, 20);
day_bench!(day21, 21);
benchmark_main!(day01, day02, day03, day04, day05,
day06, day07, day08, day09, day10,
day11, day12, day13, day14, day15,
day16, day17, day18, day19, day20);
day16, day17, day18, day19, day20,
day21);

40
2018/loc.svg
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2
2018/other/elf2c.py
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@@ -19,7 +19,7 @@ def preamble():
int c = 0;
int d = 0;
int e = 0;
int f = 0;''')
int f = 0;\n''')
def footer():

60
2018/src/day21.rs
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@@ -1,9 +1,48 @@
use std::collections::HashSet;
use std::io::Read;
use common::Solution;
#[derive(Default)]
pub struct Day21 {}
pub struct Day21 {
}
struct ValidInputs {
f: i64
}
impl ValidInputs {
pub fn new(start: i64) -> Self {
ValidInputs {
f: start
}
}
}
impl Iterator for ValidInputs {
type Item = i64;
fn next(&mut self) -> Option<i64> {
let mut f = self.f;
let mut e = f | 0x10000;
f = 13284195;
loop {
let d = e & 0xff;
f += d;
f &= 0xffffff;
f *= 65899;
f &= 0xffffff;
if 0x100 > e {
self.f = f;
return Some(f);
}
e >>= 8;
}
}
}
impl Day21 {
pub fn new() -> Self {
@@ -13,13 +52,22 @@ impl Day21 {
impl Solution for Day21 {
fn part1(&mut self, _input: &mut Read) -> String {
unimplemented!()
format!("{}", ValidInputs::new(0).next().unwrap())
}
fn part2(&mut self, _input: &mut Read) -> String {
unimplemented!()
let inputs = ValidInputs::new(0);
let mut seen = HashSet::new();
let mut last = None;
for input in inputs {
if seen.contains(&input) {
return format!("{}", last.unwrap());
} else {
last = Some(input);
seen.insert(input);
}
}
unreachable!();
}
}
#[cfg(test)]
mod tests {}