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day18: added/optimized

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This commit is contained in:
Ishan Jain 2023-12-18 14:18:12 +05:30
parent 1c40798379
commit 72b1f346b9
Signed by: ishan
GPG Key ID: 0506DB2A1CC75C27
4 changed files with 772 additions and 2 deletions
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61
src/day18/1.rs
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@ -1 +1,60 @@
const INPUTS: [&'static str; 2] = [include_str!("./sample.txt"), include_str!("./input.txt")]; #![feature(test)]
extern crate test;
const INPUTS: [&str; 2] = [include_str!("./sample.txt"), include_str!("./input.txt")];
fn process(data: &str) -> i64 {
let mut answer = 0;
let mut internal = 0;
let (mut sx, mut sy) = (0, 0);
for line in data.lines() {
let line = line.as_bytes();
let l = line.len();
let line = &line[0..l - 10];
let dist = {
let mut dist = 0;
let mut power = 10i64.pow(line.len() as u32 - 3);
for c in line[2..].iter() {
dist += power * (c - b'0') as i64;
power /= 10;
}
dist
};
let (x, y) = match line[0] {
b'R' => (0, 1),
b'D' => (1, 0),
b'L' => (0, -1),
b'U' => (-1, 0),
_ => unreachable!(),
};
internal += ((x * dist) + (y * dist)).abs();
let (dx, dy) = (sx + (x * dist), sy + (y * dist));
answer += sx * dy - dx * sy;
sx = dx;
sy = dy;
}
let answer = answer.abs();
((answer / 2) + 1) + (internal / 2)
}
fn main() {
for input in INPUTS.iter() {
println!("answer = {}", process(input));
}
}
#[bench]
fn part1(b: &mut test::Bencher) {
b.iter(|| {
let v = process(INPUTS[INPUTS.len() - 1]);
test::black_box(v);
});
}

75
src/day18/2.rs
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@ -1 +1,74 @@
const INPUTS: [&'static str; 2] = [include_str!("./sample.txt"), include_str!("./input.txt")]; #![feature(test)]
extern crate test;
const INPUTS: [&str; 2] = [include_str!("./sample.txt"), include_str!("./input.txt")];
fn process(data: &str) -> i64 {
let mut answer = 0;
let (mut sx, mut sy) = (0, 0);
let mut internal = 0;
for line in data.lines() {
let line = line.as_bytes();
let l = line.len();
let line = &line[l - 6 - 1..line.len() - 1];
let dist = hex2int(&line[0..5]);
let (x, y): (i64, i64) = match line[5] {
b'0' => (0, 1),
b'1' => (1, 0),
b'2' => (0, -1),
b'3' => (-1, 0),
_ => unreachable!(),
};
internal += ((x * dist) + (y * dist)).abs();
let (dx, dy) = (sx + (x * dist), sy + (y * dist));
answer += sx * dy - dx * sy;
sx = dx;
sy = dy;
}
let answer = answer.abs();
((answer / 2) + 1) + (internal / 2)
}
#[inline]
const fn hex2int(ip: &[u8]) -> i64 {
let mut out = 0;
let mut i = 0;
while i < ip.len() {
let byte = match ip[i] {
v @ b'0'..=b'9' => v - b'0',
v @ b'a'..=b'f' => v - b'a' + 10,
v @ b'A'..=b'F' => v - b'A' + 10,
_ => unreachable!(),
};
out <<= 4;
out |= byte as i64;
i += 1;
}
out
}
fn main() {
for input in INPUTS.iter() {
println!("answer = {}", process(input));
}
}
#[bench]
fn part2(b: &mut test::Bencher) {
b.iter(|| {
let v = process(INPUTS[INPUTS.len() - 1]);
test::black_box(v);
});
}

624
src/day18/input.txt Normal file
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@ -0,0 +1,624 @@
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src/day18/sample.txt Normal file
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