Question

How to remove duplicate sequential elements from a list in C++

Answer 1

#include <iostream>  
#include <list> 
 
using std::list;
using std::cout;
 
void printList(const list<int>& lst) {
    for (auto elem : lst) {
        cout << elem << ' ';
    }
    cout << std::endl;
}
 
int main()
{
    list<int> lst{ 1, 1, 2, 3, 4, 3, 4, 4, 5, 5, 5 };
 
    lst.unique();
 
    printList(lst);
}


 
/*
run:
 
1 2 3 4 3 4 5
 
*/

 

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Answer 2

#include <iostream>  
#include <forward_list> 
 
using std::forward_list;
using std::cout;
 
void printList(const forward_list<int>& flist) {
    for (auto elem : flist) {
        cout << elem << ' ';
    }
    cout << std::endl;
}
 
int main()
{
    forward_list<int> flist = { 1, 1, 2, 3, 4, 3, 4, 4, 5, 5, 5 };
 
    flist.unique();
 
    printList(flist);
}


 
/*
run:
 
1 2 3 4 3 4 5
 
*/

 

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