20 lines
594 B
JavaScript
20 lines
594 B
JavaScript
function day9(input, part2) {
|
|
let grid = Grid.fromStr(input).num()
|
|
|
|
let lows = grid.findAllIndices((e, pt, g) => g.getAdjNeighbors(pt).every((nb) => e < g.get(nb)))
|
|
|
|
if (!part2) {
|
|
return lows.map((e) => grid.get(e) + 1).sum()
|
|
}
|
|
|
|
let sizes = lows.map((low) => grid.bfs(low, (e, pt, g) => {
|
|
return e == 9 || g.get(pt.path.last) < e ? Grid.BFS_STOP : Grid.BFS_CONTINUE
|
|
}).filter((e) => e.result == Grid.BFS_CONTINUE).length).sort((a, b) => b - a)
|
|
|
|
return sizes[0] * sizes[1] * sizes[2]
|
|
}
|
|
|
|
if (typeof window == "undefined") {
|
|
module.exports = day9
|
|
}
|