Question

How to print all elements of an array only once in C++

Answer 1

#include <bits/stdc++.h> 
  
void printElementsOnlyOnce(int arr[], int len) { 
    std::sort(arr, arr + len); 

    for (int i=0; i < len; i++) {
       while (i < len - 1 && arr[i] == arr[i+1]) 
          i++; 
       std::cout << arr[i] << " "; 
    } 
} 
   
int main() {
    int arr[] = {3, 5, 9, 1, 7, 8, 1, 9, 0, 3, 9, 9, 5, 5, 5};   
         
    printElementsOnlyOnce(arr, sizeof(arr)/sizeof(arr[0]));
}
  
  
  
/*
run:
  
0 1 3 5 7 8 9 
  
*/

 

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