Compute number of distinct values in an array
Write a function
function solution(A);
that, given a zero-indexed array A consisting of N integers, returns the number of distinct values in array A.
Assume that:
N is an integer within the range [0..100,000];
each element of array A is an integer within the range [−1,000,000..1,000,000].
For example, given array A consisting of six elements such that:
A[0] = 2 A1 = 1 A[2] = 1
A[3] = 2 A[4] = 3 A[5] = 1
