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#include <iostream>
#include <algorithm>
#include <iterator>
#include <set>
#include <vector>
using namespace std;
 
template<typename T, typename InputIterator, typename OutputIterator>
void removeDup(InputIterator begin, InputIterator end, OutputIterator res) {
    set<T> temp(begin, end);
    copy(temp.begin(), temp.end(), res);
}
 
int main() {
    vector<int> v1 = {1, 1, 2, 3, 3, 4, 4, 3, 3};
    vector<int> res;
    removeDup(v1.begin(), v1.end(), back_inserter(res));
    copy(res.begin(), res.end(), ostream_iterator<int>(cout, "\n"));
    return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:17:55: error: no matching function for call to ‘removeDup(std::vector<int>::iterator, std::vector<int>::iterator, std::back_insert_iterator<std::vector<int> >)’
     removeDup(v1.begin(), v1.end(), back_inserter(res));
                                                       ^
prog.cpp:17:55: note: candidate is:
prog.cpp:9:6: note: template<class T, class InputIterator, class OutputIterator> void removeDup(InputIterator, InputIterator, OutputIterator)
 void removeDup(InputIterator begin, InputIterator end, OutputIterator res) {
      ^
prog.cpp:9:6: note:   template argument deduction/substitution failed:
prog.cpp:17:55: note:   couldn't deduce template parameter ‘T’
     removeDup(v1.begin(), v1.end(), back_inserter(res));
                                                       ^

Standard output is empty