Find unique numbers in array

Question

Well, I have to find how many different numbers are in an array.

For example if array is: 1 9 4 5 8 3 1 3 5

The output should be 6, because 1,9,4,5,8,3 are uniqu

Answer 1

We can use C++ STL vector in this program .

  int main() 
  {
    int a[] = {1, 9, 4, 5, 8, 3, 1, 3, 5};
    vectorv(a, a+9);

    sort(v.begin(), v.end()); 
    v.erase(unique(v.begin(), v.end()), v.end()); 

    cout<