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day13.mjs
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day13.mjs
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import fs from 'node:fs/promises'
const input = await fs.readFile('./inputs/day13.txt', 'utf-8')
const [coordinates, instructions] = input.split('\n\n').map(
section => section
.split('\n')
.filter(line => line.length)
.map(
line => line.split(/[ ,=]/)
)
)
const [maxX, maxY] = [0, 1].map(i => Math.max(...coordinates.map(c => c[i])))
let grid = new Array(maxY + 1).fill(null).map(() => new Array(maxX + 1).fill(false))
coordinates.forEach(c => grid[c[1]][c[0]] = true)
instructions.forEach(([, , axis, value], index) => {
if (axis == 'x') {
grid = grid.map(
row => row.slice(0, value).map(
(col, colIndex) => col || row[2 * value - colIndex]
)
)
} else {
grid = grid.slice(0, value).map(
(row, rowIndex) => row.map(
(col, colIndex) => col || (grid[2 * value - rowIndex] || [])[colIndex]
)
)
}
if (index == 0) {
console.log(
grid.reduce(
(acc, row) => acc + row.reduce(
(acc, col) => acc + (col ? 1 : 0),
0
), 0
)
)
}
})
console.log(
grid.map(
row => row.map(col => col ? '#' : '.').join('')
).join('\n')
)