part 1 of day 6 of adventofcode 2024 in Rust
use std::fs;
fn update_guard_loc(map: &mut Vec<Vec<char>>, guard_loc: &mut (i32, i32)) {
match map[guard_loc.0 as usize][guard_loc.1 as usize] {
'^' => {
if map[(guard_loc.0 - 1) as usize][guard_loc.1 as usize] == '#' {
map[guard_loc.0 as usize][guard_loc.1 as usize] = '>'
} else {
map[guard_loc.0 as usize][guard_loc.1 as usize] = 'X';
guard_loc.0 -= 1;
map[guard_loc.0 as usize][guard_loc.1 as usize] = '^';
}
},
'>' => {
if map[guard_loc.0 as usize][(guard_loc.1 + 1) as usize] == '#' {
map[guard_loc.0 as usize][guard_loc.1 as usize] = 'v'
} else {
map[guard_loc.0 as usize][guard_loc.1 as usize] = 'X';
guard_loc.1 += 1;
map[guard_loc.0 as usize][guard_loc.1 as usize] = '>';
}
},
'v' => {
if map[(guard_loc.0 + 1) as usize][guard_loc.1 as usize] == '#' {
map[guard_loc.0 as usize][guard_loc.1 as usize] = '<'
} else {
map[guard_loc.0 as usize][guard_loc.1 as usize] = 'X';
guard_loc.0 += 1;
map[guard_loc.0 as usize][guard_loc.1 as usize] = 'v';
}
},
'<' => {
if map[guard_loc.0 as usize][(guard_loc.1 - 1) as usize] == '#' {
map[guard_loc.0 as usize][guard_loc.1 as usize] = '^'
} else {
map[guard_loc.0 as usize][guard_loc.1 as usize] = 'X';
guard_loc.1 -= 1;
map[guard_loc.0 as usize][guard_loc.1 as usize] = '<';
}
},
_ => println!("unreachable"),
}
}
fn main() {
let contents = fs::read_to_string("input.txt").expect("Should have able to read the file");
let mut map: Vec<Vec<char>> = Vec::new();
let lines = contents.split("\n").collect::<Vec<&str>>();
for line in lines {
if line.len() == 0 {
// ignore empty line
break;
}
map.push(line.chars().collect::<Vec<char>>());
}
// Getting the first location of guard
let mut height: i32 = 0;
let mut width: i32 = 0;
let mut guard_loc: (i32, i32) = (0, 0);
for (i, lines) in map.iter().enumerate() {
for (j, chr) in lines.iter().enumerate() {
if *chr == '^' {
guard_loc.0 = i as i32;
guard_loc.1 = j as i32;
}
height = (i + 1) as i32;
width = (j + 1) as i32;
}
}
loop {
update_guard_loc(&mut map, &mut guard_loc);
match map[guard_loc.0 as usize][guard_loc.1 as usize] {
'^' => {
if guard_loc.0 - 1 < 0 {
break;
}
},
'v' => {
if guard_loc.0 + 1 > height - 1 {
break;
}
},
'>' => {
if guard_loc.1 + 1 > width - 1 {
break;
}
},
'<' => {
if guard_loc.1 - 1 < 0 {
break;
}
},
_ => println!("ureachable"),
}
}
for line in map.iter() {
println!("{:?}", line);
}
let mut count = 0;
for line in map.iter() {
for c in line.iter() {
if *c == 'X' {
count += 1;
}
}
}
println!("count: {}", count + 1);
}
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