The avatar for @jwolondon
Jo Wood
Professor of Visual Analytics interested in design, geovisualization, visual storytelling and computational thinking.
Public
Ξ🎄Advent of Code 2020
Edited
Nov 11, 2022
Fork of Advent of Code: 2020 Day 16
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Ξ🎄Advent of Code 2020
Advent of Code: 2020 Day 1Advent of Code: 2020 Day 2
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function parse(input) {
return input
.split('\n')
.map(str => str.split('').map(c => (c == '#' ? 1 : 0)));
}
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function tobogganRun(colStep, rowStep, trees) {
let collisions = 0;
let col = 0;

for (let row = 0; row < trees.length; row += rowStep) {
collisions += trees[row][col];
col = (col + colStep) % trees[0].length;
}
return collisions;
}
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function part1(input) {
return tobogganRun(3, 1, parse(input));
}
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function part2(input) {
const trees = parse(input);
return (
tobogganRun(1, 1, trees) *
tobogganRun(3, 1, trees) *
tobogganRun(5, 1, trees) *
tobogganRun(7, 1, trees) *
tobogganRun(1, 2, trees)
);
}
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