You are given an array 𝑎1,𝑎2,…,𝑎𝑛 consisting of integers from 0 to 9. A subarray 𝑎𝑙,𝑎𝑙+1,𝑎𝑙+2,…,𝑎𝑟−1,𝑎𝑟 is good if the sum of elements of this subarray is equal to the length of this subarray (∑𝑖=𝑙𝑟𝑎𝑖=𝑟−𝑙+1). For example, if 𝑎=[1,2,0], then there are 3 good subarrays: 𝑎1…1=[1]...