[Day 25](https://adventofcode.com/2018/day/25)[Day 18](https://adventofcode.com/2018/day/18)[Day 21](https://adventofcode.com/2018/day/21)Day 19[Day 16](https://adventofcode.com/2018/day/16)[Day 14](https://adventofcode.com/2018/day/14)[Day 13](https://adventofcode.com/2018/day/13)[Day 12](https://adventofcode.com/2018/day/12)[Day 10](https://adventofcode.com/2018/day/10)[Day 9](https://adventofcode.com/2018/day/9)[Day 8](https://adventofcode.com/2018/day/8)[Day 7](https://adventofcode.com/2018/day/7)[Day 6](https://adventofcode.com/2018/day/6)[Day 5](https://adventofcode.com/2018/day/5)[Day 4](https://adventofcode.com/2018/day/4)[Day 3](https://adventofcode.com/2018/day/3)Advent of Code: [Day 2](https://adventofcode.com/2018/day/2)[Day 1](https://adventofcode.com/2018/day/1)
[Day 11](https://adventofcode.com/2018/day/11)
function cellValue (x, y) {
const gridId = x + 10;
return Math.trunc((gridId * y + SERIAL) * gridId / 100) % 10 - 5;
}
sumTable = {
let out = Array(GRIDSIZE+1).fill().map(() => Array(GRIDSIZE+1).fill(0));
for (let x = GRIDSIZE; x > 0; x--) {
for (let y = GRIDSIZE; y > 0; y--) {
out[x-1][y-1] = cellValue(x, y) + out[x][y-1] + out[x-1][y] - out[x][y];
}
}
return out;
}
function squareSubgridSum (x, y, w) {
return sumTable[x-1][y-1] + sumTable[x+w-1][y+w-1] -
sumTable[x-1][y+w-1] - sumTable[x+w-1][y-1];
}
function maxSquareSubgridByWidth (w) {
let maxSum = 0;
let maxX = 0;
let maxY = 0;
for (let x = 1; x <= GRIDSIZE - w; x++) {
for (let y = 1; y <= GRIDSIZE - w; y++) {
const sum = squareSubgridSum(x, y, w);
if (sum > maxSum) {
[maxSum, maxX, maxY] = [sum, x, y];
}
}
}
return [maxX, maxY];
}
part1 = maxSquareSubgridByWidth(3).join(',')
function maxSquareSubgrid () {
let maxSum = 0;
let maxWidth = 0;
let maxX = 0;
let maxY = 0;
for (let w = 1; w <= GRIDSIZE; w++) {
for (let x = 1; x <= GRIDSIZE - w; x++) {
for (let y = 1; y <= GRIDSIZE - w; y++) {
const sum = squareSubgridSum(x, y, w);
if (sum > maxSum) {
[maxSum, maxWidth, maxX, maxY] = [sum, w, x, y];
}
}
}
}
return [maxX, maxY, maxWidth];
}
part2 = maxSquareSubgrid().join(',')
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