const check = (hash, start, n) => { let count = 0 const queue = [start] const visited = Array(n).fill(0) visited[start] = 1 while (queue.length) { count += 1 const cur = queue.shift() for (let num of hash[cur]) { if (!visited[num]) { queue.push(num) visited[num] = 1 } } } return count}const solut..