/in/foo.cc: In function 'll euler_phi(ll)':
/in/foo.cc:60:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
   60 |     for (auto [p, cnt] : factors) {
      |               ^
/in/foo.cc: In function 'void generate_divisors(const std::vector<std::pair<long long int, int> >&, int, ll, std::vector<long long int>&)':
/in/foo.cc:68:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |     if (index == factors.size()) {
      |         ~~~~~~^~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:195:22: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
  195 |                 auto [p, m_val] = st.top();
      |                      ^
/in/foo.cc:204:29: error: no matching function for call to 'max(ll&, int&)'
  204 |                 left_j = max(left_j, j_min);
      |                          ~~~^~~~~~~~~~~~~~~
In file included from /usr/include/c++/12/string:50,
                 from /usr/include/c++/12/bits/locale_classes.h:40,
                 from /usr/include/c++/12/bits/ios_base.h:41,
                 from /usr/include/c++/12/ios:42,
                 from /usr/include/c++/12/ostream:38,
                 from /usr/include/c++/12/iostream:39,
                 from /in/foo.cc:1:
/usr/include/c++/12/bits/stl_algobase.h:254:5: note: candidate: 'template<class _Tp> const _Tp& std::max(const _Tp&, const _Tp&)'
  254 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/12/bits/stl_algobase.h:254:5: note:   template argument deduction/substitution failed:
/in/foo.cc:204:29: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
  204 |                 left_j = max(left_j, j_min);
      |                          ~~~^~~~~~~~~~~~~~~
/usr/include/c++/12/bits/stl_algobase.h:300:5: note: candidate: 'template<class _Tp, class _Compare> const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  300 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/12/bits/stl_algobase.h:300:5: note:   template argument deduction/substitution failed:
/in/foo.cc:204:29: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
  204 |                 left_j = max(left_j, j_min);
      |                          ~~~^~~~~~~~~~~~~~~
In file included from /usr/include/c++/12/algorithm:61,
                 from /in/foo.cc:3:
/usr/include/c++/12/bits/stl_algo.h:5746:5: note: candidate: 'template<class _Tp> _Tp std::max(initializer_list<_Tp>)'
 5746 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/12/bits/stl_algo.h:5746:5: note:   template argument deduction/substitution failed:
/in/foo.cc:204:29: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
  204 |                 left_j = max(left_j, j_min);
      |                          ~~~^~~~~~~~~~~~~~~
/usr/include/c++/12/bits/stl_algo.h:5756:5: note: candidate: 'template<class _Tp, class _Compare> _Tp std::max(initializer_list<_Tp>, _Compare)'
 5756 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/12/bits/stl_algo.h:5756:5: note:   template argument deduction/substitution failed:
/in/foo.cc:204:29: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
  204 |                 left_j = max(left_j, j_min);
      |                          ~~~^~~~~~~~~~~~~~~