Language: C++

#include <bits/stdc++.h>

using namespace std;

void hawawa()
{
	int n;
	cin >> n;
	map<char, int> cnt;
	for (char c = 'a'; c <= 'z'; c++) {
		cnt[c] = numeric_limits<int>::max();
	}
	while (n--) {
		string str;
		cin >> str;
		sort(begin(str), end(str));
		for (char c = 'a'; c <= 'z'; c++) {
			cnt[c] = min(cnt[c], upper_bound(begin(str), end(str), c) - lower_bound(begin(str), end(str), c));
		}
	}
	for (char c = 'a'; c <= 'z'; c++) {
		cout << string(cnt[c], c);
	}
	cout << "\n";
}

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	hawawa();
	return 0;
}


Compiler output:
a.cc: In function 'void hawawa()':
a.cc:18:37: error: no matching function for call to 'min(std::map<char, int>::mapped_type&, __gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> >::difference_type)'
   18 |                         cnt[c] = min(cnt[c], upper_bound(begin(str), end(str), c) - lower_bound(begin(str), end(str), c));
      |                                  ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:18:37: note:   deduced conflicting types for parameter 'const _Tp' ('int' and '__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> >::difference_type' {aka 'long int'})
   18 |                         cnt[c] = min(cnt[c], upper_bound(begin(str), end(str), c) - lower_bound(begin(str), end(str), c));
      |                                  ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:18:37: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   18 |                         cnt[c] = min(cnt[c], upper_bound(begin(str), end(str), c) - lower_bound(begin(str), end(str), c));
      |                                  ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~