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

2 Answers

0 votes
#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.sort();
	lst.unique();

	printList(lst);

	return 0;
}

/*
run:

1 2 3 4 5

*/

 




answered Jan 6 by avibootz
edited Jan 7 by avibootz
0 votes
#include <iostream>  
#include <list> 
#include <set> 

using std::list;
using std::set;
using std::cout;

void printList(const list<int> &lst)
{
	list<int>::const_iterator i;
	for (i = lst.begin(); i != lst.end(); i++)
		cout << *i << " ";
	cout << std::endl;
}

void removeDuplicates(list<int> &lst)
{
	set<int> found;
	for (list<int>::iterator i = lst.begin(); i != lst.end();) {
		if (!found.insert(*i).second) {
			i = lst.erase(i);
		}
		else {
			i++;
		}
	}
}

int main()
{
	list<int> lst{ 1, 1, 2, 3, 4, 3, 4, 4, 5, 5, 5 };

	removeDuplicates(lst);
	printList(lst);

	return 0;
}

/*
run:

1 2 3 4 5

*/

 




answered Jan 6 by avibootz
edited Jan 7 by avibootz
...