Fun with AGp

You are given an 1-based array A and its fixed parameters: R, p1, p2. You need to mantain this array, performing some operations. The operations are as follows: - 0 S D X Y Add an AGP with the start term of S, the common difference of D, common ratio of R from the X-th to the to Y-th element of A. In other words: add S , (S+D)*R , (S+2D)*R2 ,....., (S+(Y-X)*D)*RY-X respectively to A[X], A[X+1]