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#include <algorithm>
#include <map>
#include <iterator>
#include <iostream>
 
int main() 
{
	int a[] = {2,2,3,4,5,6,5,4,3,2,3,4,5,4,3,3,3,3,4,5,4,2,3,4,5,4};
	size_t sz = sizeof(a)/sizeof(a[0]);
 
	std::map<int, size_t> m;
/*
	std::for_each(a, a+sz, [&m](int v) {
		m[v]++;
	});
	*/
 
	std::copy(a, a+sz, std::inserter(m, m.end()));
 
	auto ptrMax = std::max_element(m.begin(), m.end(), [&m](const std::map<int, size_t>::value_type & v1, const std::map<int, size_t>::value_type & v2) {
		return v1.second < v2.second;
	});
 
	std::cout << ptrMax->first << ": " << ptrMax->second;
 
 
}

In file included from /usr/include/c++/4.9/algorithm:61:0,
                 from prog.cpp:1:
/usr/include/c++/4.9/bits/stl_algobase.h: In instantiation of 'static _OI std::__copy_move<false, false, std::random_access_iterator_tag>::__copy_m(_II, _II, _OI) [with _II = int*; _OI = std::insert_iterator<std::map<int, unsigned int> >]':
/usr/include/c++/4.9/bits/stl_algobase.h:396:70:   required from '_OI std::__copy_move_a(_II, _II, _OI) [with bool _IsMove = false; _II = int*; _OI = std::insert_iterator<std::map<int, unsigned int> >]'
/usr/include/c++/4.9/bits/stl_algobase.h:434:38:   required from '_OI std::__copy_move_a2(_II, _II, _OI) [with bool _IsMove = false; _II = int*; _OI = std::insert_iterator<std::map<int, unsigned int> >]'
/usr/include/c++/4.9/bits/stl_algobase.h:466:17:   required from '_OI std::copy(_II, _II, _OI) [with _II = int*; _OI = std::insert_iterator<std::map<int, unsigned int> >]'
prog.cpp:18:46:   required from here
/usr/include/c++/4.9/bits/stl_algobase.h:336:18: error: no match for 'operator=' (operand types are 'std::insert_iterator<std::map<int, unsigned int> >' and 'int')
        *__result = *__first;
                  ^
/usr/include/c++/4.9/bits/stl_algobase.h:336:18: note: candidates are:
In file included from /usr/include/c++/4.9/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.9/algorithm:61,
                 from prog.cpp:1:
/usr/include/c++/4.9/bits/stl_iterator.h:639:7: note: std::insert_iterator<_Container>& std::insert_iterator<_Container>::operator=(const typename _Container::value_type&) [with _Container = std::map<int, unsigned int>; typename _Container::value_type = std::pair<const int, unsigned int>]
       operator=(const typename _Container::value_type& __value)
       ^
/usr/include/c++/4.9/bits/stl_iterator.h:639:7: note:   no known conversion for argument 1 from 'int' to 'const value_type& {aka const std::pair<const int, unsigned int>&}'
/usr/include/c++/4.9/bits/stl_iterator.h:647:7: note: std::insert_iterator<_Container>& std::insert_iterator<_Container>::operator=(typename _Container::value_type&&) [with _Container = std::map<int, unsigned int>; typename _Container::value_type = std::pair<const int, unsigned int>]
       operator=(typename _Container::value_type&& __value)
       ^
/usr/include/c++/4.9/bits/stl_iterator.h:647:7: note:   no known conversion for argument 1 from 'int' to 'std::map<int, unsigned int>::value_type&& {aka std::pair<const int, unsigned int>&&}'
/usr/include/c++/4.9/bits/stl_iterator.h:588:11: note: std::insert_iterator<std::map<int, unsigned int> >& std::insert_iterator<std::map<int, unsigned int> >::operator=(const std::insert_iterator<std::map<int, unsigned int> >&)
     class insert_iterator
           ^
/usr/include/c++/4.9/bits/stl_iterator.h:588:11: note:   no known conversion for argument 1 from 'int' to 'const std::insert_iterator<std::map<int, unsigned int> >&'
/usr/include/c++/4.9/bits/stl_iterator.h:588:11: note: std::insert_iterator<std::map<int, unsigned int> >& std::insert_iterator<std::map<int, unsigned int> >::operator=(std::insert_iterator<std::map<int, unsigned int> >&&)
/usr/include/c++/4.9/bits/stl_iterator.h:588:11: note:   no known conversion for argument 1 from 'int' to 'std::insert_iterator<std::map<int, unsigned int> >&&'

Standard output is empty