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fn main() {
let input = advent::read_file(1);
println!("1a: {}", find_floor(&input));
println!("1b: {}", find_basement(&input));
}
fn find_floor(input: &str) -> i32 {
let mut pos = 0;
for c in input.chars() {
match c {
'(' => pos += 1,
')' => pos -= 1,
_ => break,
}
}
pos
}
fn find_basement(input: &str) -> i32 {
let mut count = 1;
let mut pos = 0;
for c in input.chars() {
match c {
'(' => pos += 1,
')' => pos -= 1,
_ => break,
}
if pos < 0 {
return count;
}
count += 1;
}
panic!("never reached basement");
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_floor() {
assert_eq!(find_floor("(())"), 0);
assert_eq!(find_floor("()()"), 0);
assert_eq!(find_floor("((("), 3);
assert_eq!(find_floor("(()(()("), 3);
assert_eq!(find_floor("))((((("), 3);
assert_eq!(find_floor("())"), -1);
assert_eq!(find_floor("))("), -1);
assert_eq!(find_floor(")))"), -3);
assert_eq!(find_floor(")())())"), -3);
}
#[test]
fn test_basement() {
assert_eq!(find_basement(")"), 1);
assert_eq!(find_basement("()())"), 5);
}
}
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