unique() Function in C++

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This C++ program removes equal adjacent elements using unique() algorithm. The algorithm removes duplicate characters which are adjacent to each other in a container. The program creates an array of characters and runs the algorithm on the array. The array elements are then printed on the standard output.

Here is the source code of the C++ program which removes equal adjacent elements using unique() algorithm. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

  1. /*
  2.  * C++ Program to remove equal adjacent elements using unique() algorithm
  3.  */
  4. #include <iostream>
  5. #include <algorithm>
  6. #include <functional>
  7. #include <vector>
  8. #include <iomanip>
  9. #include <iterator>
  10. using namespace std;
  11.  
  12. void print(char a[], int N)
  13. {   
  14.     for (int i = 0; i < N; i++)
  15.     {
  16.         cout <<  a[i] << "  ";
  17.     }
  18.     cout << endl;
  19. }
  20.  
  21. int main()
  22. {
  23.     char a[] = {'a', 'a', 'a', 'e', 'c', 'd', 'd', 'e', 'e', 'e'};
  24.     int alen = sizeof(a) / sizeof(char);
  25.     char b[alen];
  26.     char * p;
  27.  
  28.     cout << "Characters : ";
  29.     print(a, alen);
  30.     cout << "Removing duplicate adjacent characters ... " << endl;
  31.     cout << "Characters : ";
  32.     // unique returns pointer to one element ahead of last element
  33.     p = unique(a, a + alen);
  34.     print(a, p - a);
  35. }

$ a.out
Characters : a  a  a  e  c  d  d  e  e  e  
Removing duplicate adjacent characters ... 
Characters : a  e  c  d  e

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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