1359. Count All Valid Pickup and Delivery Options

Runtime    0 ms
Beats      100%


Memory     39.1 MB
Beats      71.95%


class Solution {
    public int countOrders(int n) {
        long count = 1;
        for(int i = 2; i <=n; i++){
            count = (count *(2 * i - 1) * i) % 1000000007;

        }
        return (int) count;
    }
}