const input = await Bun.file("input.txt").text();

const grid = input.split("\n").map((r) => r.split(""));

let total = 0;
for (let y = 0; y < grid.length; y++) {
    for (let x = 0; x < grid[0]!.length; x++) {
        if (grid[y]![x] != "@") continue;
        let rolls = 0;
        for (let dy = -1; dy <= 1; dy++) {
            for (let dx = -1; dx <= 1; dx++) {
                if (dy == 0 && dx == 0) continue;
                if (grid[y + dy]?.[x + dx] == "@") rolls++;
            }
        }
        if (rolls < 4) total++;
    }
}
console.log("A:", total);

let totalRemoved = 0;
while (true) {
    let removed = 0;
    for (let y = 0; y < grid.length; y++) {
        for (let x = 0; x < grid[0]!.length; x++) {
            if (grid[y]![x] != "@") continue;
            let rolls = 0;
            for (let dy = -1; dy <= 1; dy++) {
                for (let dx = -1; dx <= 1; dx++) {
                    if (dy == 0 && dx == 0) continue;
                    if (grid[y + dy]?.[x + dx] == "@") rolls++;
                }
            }
            if (rolls < 4) {
                grid[y]![x]! = ".";
                removed++;
            }
        }
    }
    if (removed == 0) break;
    totalRemoved += removed;
}
console.log("B:", totalRemoved);