// Create an empty array that we will use to build the result, iterate // over the digits in num from right to left adding the current carry, // we use mod to compute the resulting digit and div // 10 ...

For a non-negative integer X, the array-form of X is an array of its digits in left to right order. For example, if X = 1231, then the array form is [1,2,3,1]. Given the array-form A of a non-negative ...