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Day 4 part 2

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Wesley Moore 2022-12-04 15:54:30 +10:00
parent a0e0065c40
commit 49f1283cf6
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15
2022/src/days/day_4.gleam
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@ -16,7 +16,11 @@ pub fn pt_1(input: String) -> Int {
}
pub fn pt_2(input: String) -> Int {
todo
string.split(input, on: "\n")
|> iterator.from_list
|> iterator.map(parse_line)
|> iterator.filter(overlaps)
|> iterator.fold(0, fn(sum, _) { sum + 1 })
}
fn parse_line(line: String) -> #(Range, Range) {
@ -43,3 +47,12 @@ fn fully_contains(pair: #(Range, Range)) -> Bool {
let b = pair.1
b.start >= a.start && b.end <= a.end || a.start >= b.start && a.end <= b.end
}
fn overlaps(pair: #(Range, Range)) -> Bool {
let a = pair.0
let b = pair.1
case a.start < b.start {
True -> b.start <= a.end
False -> a.start <= b.end
}
}