Table of content

What is this :grey_question:

The rules of the game are explained in my original post.

39th Challenge

Challenge

Today I’m solving today’s AoC day 8 2021.

Solution :white_check_mark:

part 1 easy, part 2 not so much.. there is a bug in here, which I will try to fix tomrrow.

	fn main() {

	    const N:usize = 10;
	    let mut tunnel = INPUT.lines()
	        .map(|x|{x.as_bytes()})
	        .fold(vec![b'9';N+2],|mut acc:Vec<u8>, inst|{
	            acc.push(b'9');
	            acc.extend(inst.to_vec());
	            acc.push(b'9');
	            acc
	        });
	    tunnel.extend(vec![b'9';(N+2)*2]);

	    let x:Vec<(bool,u8)> = tunnel
	        .windows((N+2)*3).collect::<Vec<&[u8]>>()
	        .iter()
	        .enumerate()
	        .map(|x|{(
	                    x.1[1] > x.1[N+3]
	                    && x.1[(N+2)*2+1] > x.1[N+3]
	                    && x.1[N+2] > x.1[N+3]
	                    && x.1[N+4] > x.1[N+3]
	                , x.1[N+3]- 48)
	            })
	        .collect();

	    let sol1:u32=x.iter()
	        .filter(|x|x.0)
	        .map(|x|x.1)
	        .fold(0,|acc,inst|{acc+inst+1});

	    println!("{:?}",sol1);

	}


	const INPUT:&str = "2199943210
	3987894921
	9856789892
	8767896789
	9899965678";

github playground