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Add day 2 part 2 in Rust

This commit is contained in:
kageru 2019-12-03 06:10:59 +01:00
parent d46c40b6e9
commit 31f3d56bcf
Signed by: kageru
GPG Key ID: 8282A2BEA4ADA3D2
1 changed files with 14 additions and 8 deletions
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22
2019/02/day2.rs
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@ -12,6 +12,16 @@ pub fn main() {
.map(|n| n.parse().unwrap())
.collect();
println!("Part 1: {}", execute(&mut input.clone(), 12, 2));
let part2_target = 19690720;
let part2 = (1..99)
.flat_map(|x| (1..99).map(move |y| (x, y)))
.map(|(x, y)| (x, y, execute(&mut input.clone(), x, y)))
.filter(|(_, _, r)| r == &part2_target)
.map(|(x, y, _)| x * 100 + y)
.next()
.unwrap();
println!("Part 2: {}", part2);
}
fn execute(input: &mut Vec<usize>, p1: usize, p2: usize) -> usize {
@ -19,19 +29,15 @@ fn execute(input: &mut Vec<usize>, p1: usize, p2: usize) -> usize {
input[2] = p2;
for i in (0..).step_by(4) {
let opcode = input[i];
let first = input[i+1];
let second = input[i+2];
let target = input[i+3];
if target == 0 {
dbg!("target is 0", target, opcode, first, second);
}
let first = input[i + 1];
let second = input[i + 2];
let target = input[i + 3];
match opcode {
1 => input[target] = input[first] + input[second],
2 => input[target] = input[first] * input[second],
99 => break,
_ => unreachable!("Invalid opcode")
_ => unreachable!("Invalid opcode"),
}
}
dbg!(&input);
input[0]
}