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11.js
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11.js
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(async function main () {
const image = input.split('\n');
const n = image.length
const m = image[0].length
const emptyColumn = []
const emptyRow = image
.map((row, i) => [row, i])
.filter(([row]) => !row.includes('#'))
.map(([_, i]) => i)
const galaxies = []
for (let i = 0; i < m; i++) {
let hasGalaxy = false
for (let j = 0; j < n; j++) {
if (image[j][i] == '#') {
hasGalaxy = true
galaxies.push([j, i])
}
}
if (!hasGalaxy) {
emptyColumn.push(i)
}
}
console.log(input, galaxies, emptyRow, emptyColumn);
let ans = 0
// find distance between each galaxies
for (let i = 0; i < galaxies.length - 1; i++) {
for (let j = i + 1; j < galaxies.length; j++) {
const [y1, x1] = galaxies[i]
const [y2, x2] = galaxies[j]
const dx = Math.abs(x1 - x2)
const dy = Math.abs(y1 - y2)
const rowsBetween = emptyRow.filter(row => (y1 < row && row < y2) || (y1 > row && row > y2))
const columnsBetween = emptyColumn.filter(col => (x1 < col && col < x2) || (x1 > col && col > x2))
// console.log('galaxies = ', galaxies[i], galaxies[j]);
// console.log('dx = ', dx, 'dy = ', dy);
// console.log('rows = ', rowsBetween, 'columns = ', columnsBetween);
// console.log('-----------');
ans += dx + dy + rowsBetween.length * 999999 + columnsBetween.length * 999999
}
}
console.log(ans);
})()