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two.rs
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two.rs
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use libaoc::{Day, DayNumber};
pub fn two() -> Day<2021> {
Day::new(
DayNumber::Two,
|input| {
let (depth, horizontal) =
input
.lines()
.fold((0, 0), |(depth, horizontal), instruction| {
if !instruction.is_empty() {
let (inst, str_num) = instruction.split_once(' ').unwrap();
let number = str_num.parse::<u32>().unwrap();
match inst {
"forward" => (depth, horizontal + number),
"down" => (depth + number, horizontal),
"up" => (depth - number, horizontal),
_ => unreachable!(),
}
} else {
(depth, horizontal)
}
});
Box::new(depth * horizontal)
},
|input| {
let (depth, horizontal, _aim) =
input
.lines()
.fold((0, 0, 0), |(depth, horizontal, aim), instruction| {
if !instruction.is_empty() {
let (inst, str_num) = instruction.split_once(' ').unwrap();
let number = str_num.parse::<u32>().unwrap();
match inst {
"forward" => (depth + aim * number, horizontal + number, aim),
"down" => (depth, horizontal, aim + number),
"up" => (depth, horizontal, aim - number),
_ => unreachable!(),
}
} else {
(depth, horizontal, aim)
}
});
Box::new(depth * horizontal)
},
)
}