Language: C++

#include<bits/stdc++.h>

using namespace std ;
int main(){
  pair<pair<string,int>,int> m[100];
  
  int a;
  cin>>a;
  for(int i =0;i<a;i++){
    int t ;
    string city;
    
    cin>>city>>t;
    
    m[i] = make_pair(make_pair(city,t),i);
  }
  sort(m,m+a);
  for(int i =0;i<a;i++){
    for(auto k:m[i])
    {
      cout<<k.second+1<<endl;
    }
  } 
}


Compiler output:
a.cc: In function 'int main()':
a.cc:19:19: error: no matching function for call to 'begin(std::pair<std::pair<std::__cxx11::basic_string<char>, int>, int>&)'
   19 |     for(auto k:m[i])
      |                   ^
In file included from /usr/include/c++/14/bits/algorithmfwd.h:39,
                 from /usr/include/c++/14/bits/stl_algo.h:59,
                 from /usr/include/c++/14/algorithm:61,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/initializer_list:88:5: note: candidate: 'template<class _Tp> constexpr const _Tp* std::begin(initializer_list<_Tp>)'
   88 |     begin(initializer_list<_Tp> __ils) noexcept
      |     ^~~~~
/usr/include/c++/14/initializer_list:88:5: note:   template argument deduction/substitution failed:
a.cc:19:19: note:   'std::pair<std::pair<std::__cxx11::basic_string<char>, int>, int>' is not derived from 'std::initializer_list<_Tp>'
   19 |     for(auto k:m[i])
      |                   ^
In file included from /usr/include/c++/14/string:53,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/bits/range_access.h:52:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(_Container&)'
   52 |     begin(_Container& __cont) -> decltype(__cont.begin())
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:52:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(_Container&) [with _Container = std::pair<std::pair<std::__cxx11::basic_string<char>, int>, int>]':
a.cc:19:19:   required from here
   19 |     for(auto k:m[i])
      |                   ^
/usr/include/c++/14/bits/range_access.h:52:50: error: 'struct std::pair<std::pair<std::__cxx11::basic_string<char>, int>, int>' has no member named 'begin'
   52 |     begin(_Container& __cont) -> decltype(__cont.begin())
      |                                           ~~~~~~~^~~~~
/usr/include/c++/14/bits/range_access.h:63:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(const _Container&)'
   63 |     begin(const _Container& __cont) -> decltype(__cont.begin())
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:63:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(const _Container&) [with _Container = std::pair<std::pair<std::__cxx11::basic_string<char>, int>, int>]':
a.cc:19:19:   required from here
   19 |     for(auto k:m[i])
      |                   ^
/usr/include/c++/14/bits/range_access.h:63:56: error: 'const struct std::pair<std::pair<std::__cxx11::basic_string<char>, int>, int>' has no member named 'begin'
   63 |     begin(const _Container& __cont) -> decltype(__cont.begin())
      |                                                 ~~~~~~~^~~~~
/usr/include/c++/14/bits/range_access.h:95:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::begin(_Tp (&)[_Nm])'
   95 |     begin(_Tp (&__arr)[_Nm]) noexcept
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:95:5: note:   template argument deduction/substitution failed:
a.cc:19:19: note:   mismatched types '_Tp [_Nm]' and 'std::pair<std::pair<std::__cxx11::basic_string<char>, int>, int>'
   19 |     for(auto k:m[i])
      |                   ^
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:166:
/usr/include/c++/14/valarray:1227:5: note: candidate: 'template<class _Tp> _Tp* std::begin(valarray<_Tp>&)'
 1227 |     begin(valarray<_Tp>& __va) noexcept
      |     ^~~~~
/usr/include/c++/14/valarray:1227:5: note:   template argument deduction/substitution failed:
a.cc:19:19: note:   'std::pair<std::pair<std::__cxx11::basic_string<char>, int>, int>' is not derived from 'std::valarray<_Tp>'
   19 |     for(auto k:m[i])
      |                   ^
/usr/include/c++/14/valarray:1238:5: note: candidate: 'template<class _Tp> const _Tp* std::begin(const valarray<_Tp>&)'
 1238 |     begin(const valarray<_Tp>& __va) noexcept
      |     ^~~~~
/usr/include/c++/14/valarray:1238:5: note:   template argument deduction/substitution failed:
a.cc:19:19: note:   'std::pair<std::pair<std::__cxx11::basic_string<char>, int>, int>' is not derived from 'const std::valarray<_Tp>'
   19 |     for(auto k:m[i])
      |                   ^
a.cc:19:19: error: no matching function for call to 'end(std::pair<std::pair<std::__cxx11::basic_string<char>, int>, int>&)'
/usr/include/c++/14/initializer_list:99:5: note: candidate: 'template<class _Tp> constexpr const _Tp* std::end(initializer_list<_Tp>)'
   99 |     end(initializer_list<_Tp> __ils) noexcept
      |     ^~~
/usr/include/c++/14/initializer_list:99:5: note:   template argument deduction/substitution failed:
a.cc:19:19: note:   'std::pair<std::pair<std::__cxx11::basic_string<char>, int>, int>' is not derived from 'std::initializer_list<_Tp>'
   19 |     for(auto k:m[i])
      |                   ^
/usr/include/c++/14/bits/range_access.h:74:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.end()) std::end(_Container&)'
   74 |     end(_Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/14/bits/range_access.h:74:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.end()) std::end(_Container&) [with _Container = std::pair<std::pair<std::__cxx11::basic_string<char>, int>, int>]':
a.cc:19:19:   required from here
   19 |     for(auto k:m[i])
      |                   ^
/usr/include/c++/14/bits/range_access.h:74:48: error: 'struct std::pair<std::pair<std::__cxx11::basic_string<char>, int>, int>' has no member named 'end'
   74 |     end(_Container& __cont) -> decltype(__cont.end())
      |                                         ~~~~~~~^~~
/usr/include/c++/14/bits/range_access.h:85:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.end()) std::end(const _Container&)'
   85 |     end(const _Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/14/bits/range_access.h:85:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.end()) std::end(const _Container&) [with _Container = std::pair<std::pair<std::__cxx11::basic_string<char>, int>, int>]':
a.cc:19:19:   required from here
   19 |     for(auto k:m[i])
      |                   ^
/usr/include/c++/14/bits/range_access.h:85:54: error: 'const struct std::pair<std::pair<std::__cxx11::basic_string<char>, int>, int>' has no member named 'end'
   85 |     end(const _Container& __cont) -> decltype(__cont.end())
      |                                               ~~~~~~~^~~
/usr/include/c++/14/bits/range_access.h:106:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::end(_Tp (&)[_Nm])'
  106 |     end(_Tp (&__arr)[_Nm]) noexcept
      |     ^~~
/usr/include/c++/14/bits/range_access.h:106:5: note:   template argument deduction/substitution failed:
a.cc:19:19: note:   mismatched types '_Tp [_Nm]' and 'std::pair<std::pair<std::__cxx11::basic_string<char>, int>, int>'
   19 |     for(auto k:m[i])
      |                   ^
/usr/include/c++/14/valarray:1249:5: note: candidate: 'template<class _Tp> _Tp* std::end(valarray<_Tp>&)'
 1249 |     end(valarray<_Tp>& __va) noexcept
      |     ^~~
/usr/include/c++/14/valarray:1249:5: note:   template argument deduction/substitution failed:
a.cc:19:19: note:   'std::pair<std::pair<std::__cxx11::basic_string<char>, int>, int>' is not derived from 'std::valarray<_Tp>'
   19 |     for(auto k:m[i])
      |                   ^
/usr/include/c++/14/valarray:1265:5: note: candidate: 'template<class _Tp> const _Tp* std::end(const valarray<_Tp>&)'
 1265 |     end(const valarray<_Tp>& __va) noexcept
      |     ^~~
/usr/include/c++/14/valarray:1265:5: note:   template argument deduction/substitution failed:
a.cc:19:19: note:   'std::pair<std::pair<std::__cxx11::basic_string<char>, int>, int>' is not derived from 'const std::valarray<_Tp>'
   19 |     for(auto k:m[i])
      |                   ^