Language: C++

#include<bits/stdc++.h>
using namespace std;
int main() {
  long long N, bit=0, bittest=0, bitxor, ans=200000; cin >> N;
  char c;
  for (long long i=0; i<N; i++) {
    cin >> c;
    if (c=='#') bit |= 1<<(N-1-i);
  }
  ans = min(ans,__builtin_popcount(bit^0));
  for (long long i=0; i<=N; i++) {
    bittest |= 1<<i;
    bitxor = bit^bittest;
    ans = min(ans,__builtin_popcount(bitxor));
  }
  cout << ans << "\n";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:12: error: no matching function for call to 'min(long long int&, int)'
   10 |   ans = min(ans,__builtin_popcount(bit^0));
      |         ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:10:12: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   10 |   ans = min(ans,__builtin_popcount(bit^0));
      |         ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:10:12: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   10 |   ans = min(ans,__builtin_popcount(bit^0));
      |         ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:14:14: error: no matching function for call to 'min(long long int&, int)'
   14 |     ans = min(ans,__builtin_popcount(bitxor));
      |           ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:14:14: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   14 |     ans = min(ans,__builtin_popcount(bitxor));
      |           ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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
/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:14:14: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   14 |     ans = min(ans,__builtin_popcount(bitxor));
      |           ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~