Codility : Distinct


Write a function

def 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 A[1] = 1 A[2] = 1 A[3] = 2 A[4] = 3 A[5] = 1

the function should return 3, because there are 3 distinct values appearing in array A, namely 1, 2 and 3.


  • expected worst-case time complexity is O(N*log(N));
  • expected worst-case space complexity is O(N), beyond input storage (not counting the storage required for input arguments).

Elements of input arrays can be modified.

Python Solution : 

def solution(A):
    # write your code in Python 2.7
    for i in xrange(0,n):
    return len(res) April 6, 2016, 7:53 a.m.