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const INPUT: [&[u8]; 323] = 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const W: usize = INPUT[0].len();
fn in_slope(dh: usize, dw: usize) -> usize {
INPUT.iter()
.step_by(dh)
.zip((0..W).cycle().step_by(dw))
.filter(|&(row, c)| row[c] == b'#')
.count()
}
aoc2020::main! {
let part_one = in_slope(1,3);
let part_two = [(1,1),(1,3),(1,5),(1,7),(2,1)].iter()
.map(|&(dh,dw)| in_slope(dh,dw))
.product::<usize>();
(part_one, part_two)
}