Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  for(int i=0;i<3;i++){
  tuple<int, int, int> data(1, 2, 3);
  cout << get<i>(data) << endl;
}
}
if(0){
int main(){
  int n;
  cin>>n;
  vector<pair
  for(int i; i<n;i++){
    string tmp1;
    int tmp2;
    cin>>tmp1>>tmp2;
  }
    
}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:17: error: no matching function for call to 'get<i>(std::tuple<int, int, int>&)'
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 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_pair.h:1250:5: note: candidate: 'template<long unsigned int _Int, class _Tp1, class _Tp2> constexpr typename std::tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type& std::get(pair<_Tp1, _Tp2>&)'
 1250 |     get(pair<_Tp1, _Tp2>& __in) noexcept
      |     ^~~
/usr/include/c++/14/bits/stl_pair.h:1250:5: note:   template argument deduction/substitution failed:
a.cc:6:17: error: the value of 'i' is not usable in a constant expression
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
a.cc:4:11: note: 'int i' is not const
    4 |   for(int i=0;i<3;i++){
      |           ^
a.cc:6:17: note: in template argument for type 'long unsigned int'
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
/usr/include/c++/14/bits/stl_pair.h:1255:5: note: candidate: 'template<long unsigned int _Int, class _Tp1, class _Tp2> constexpr typename std::tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&& std::get(pair<_Tp1, _Tp2>&&)'
 1255 |     get(pair<_Tp1, _Tp2>&& __in) noexcept
      |     ^~~
/usr/include/c++/14/bits/stl_pair.h:1255:5: note:   template argument deduction/substitution failed:
a.cc:6:17: error: the value of 'i' is not usable in a constant expression
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
a.cc:4:11: note: 'int i' is not const
    4 |   for(int i=0;i<3;i++){
      |           ^
a.cc:6:17: note: in template argument for type 'long unsigned int'
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
/usr/include/c++/14/bits/stl_pair.h:1260:5: note: candidate: 'template<long unsigned int _Int, class _Tp1, class _Tp2> constexpr const typename std::tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type& std::get(const pair<_Tp1, _Tp2>&)'
 1260 |     get(const pair<_Tp1, _Tp2>& __in) noexcept
      |     ^~~
/usr/include/c++/14/bits/stl_pair.h:1260:5: note:   template argument deduction/substitution failed:
a.cc:6:17: error: the value of 'i' is not usable in a constant expression
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
a.cc:4:11: note: 'int i' is not const
    4 |   for(int i=0;i<3;i++){
      |           ^
a.cc:6:17: note: in template argument for type 'long unsigned int'
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
/usr/include/c++/14/bits/stl_pair.h:1265:5: note: candidate: 'template<long unsigned int _Int, class _Tp1, class _Tp2> constexpr const typename std::tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&& std::get(const pair<_Tp1, _Tp2>&&)'
 1265 |     get(const pair<_Tp1, _Tp2>&& __in) noexcept
      |     ^~~
/usr/include/c++/14/bits/stl_pair.h:1265:5: note:   template argument deduction/substitution failed:
a.cc:6:17: error: the value of 'i' is not usable in a constant expression
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
a.cc:4:11: note: 'int i' is not const
    4 |   for(int i=0;i<3;i++){
      |           ^
a.cc:6:17: note: in template argument for type 'long unsigned int'
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
In file included from /usr/include/c++/14/bits/memory_resource.h:47,
                 from /usr/include/c++/14/string:68,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/tuple:2445:5: note: candidate: 'template<long unsigned int __i, class ... _Elements> constexpr std::__tuple_element_t<__i, std::tuple<_Elements ...> >& std::get(tuple<_Elements ...>&)'
 2445 |     get(tuple<_Elements...>& __t) noexcept
      |     ^~~
/usr/include/c++/14/tuple:2445:5: note:   template argument deduction/substitution failed:
a.cc:6:17: error: the value of 'i' is not usable in a constant expression
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
a.cc:4:11: note: 'int i' is not const
    4 |   for(int i=0;i<3;i++){
      |           ^
a.cc:6:17: note: in template argument for type 'long unsigned int'
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
/usr/include/c++/14/tuple:2451:5: note: candidate: 'template<long unsigned int __i, class ... _Elements> constexpr std::__tuple_element_t<__i, std::tuple<_Elements ...> >& std::get(const tuple<_Elements ...>&)'
 2451 |     get(const tuple<_Elements...>& __t) noexcept
      |     ^~~
/usr/include/c++/14/tuple:2451:5: note:   template argument deduction/substitution failed:
a.cc:6:17: error: the value of 'i' is not usable in a constant expression
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
a.cc:4:11: note: 'int i' is not const
    4 |   for(int i=0;i<3;i++){
      |           ^
a.cc:6:17: note: in template argument for type 'long unsigned int'
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
/usr/include/c++/14/tuple:2457:5: note: candidate: 'template<long unsigned int __i, class ... _Elements> constexpr std::__tuple_element_t<__i, std::tuple<_Elements ...> >&& std::get(tuple<_Elements ...>&&)'
 2457 |     get(tuple<_Elements...>&& __t) noexcept
      |     ^~~
/usr/include/c++/14/tuple:2457:5: note:   template argument deduction/substitution failed:
a.cc:6:17: error: the value of 'i' is not usable in a constant expression
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
a.cc:4:11: note: 'int i' is not const
    4 |   for(int i=0;i<3;i++){
      |           ^
a.cc:6:17: note: in template argument for type 'long unsigned int'
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
/usr/include/c++/14/tuple:2466:5: note: candidate: 'template<long unsigned int __i, class ... _Elements> constexpr std::__tuple_element_t<__i, std::tuple<_Elements ...> >&& std::get(const tuple<_Elements ...>&&)'
 2466 |     get(const tuple<_Elements...>&& __t) noexcept
      |     ^~~
/usr/include/c++/14/tuple:2466:5: note:   template argument deduction/substitution failed:
a.cc:6:17: error: the value of 'i' is not usable in a constant expression
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
a.cc:4:11: note: 'int i' is not const
    4 |   for(int i=0;i<3;i++){
      |           ^
a.cc:6:17: note: in template argument for type 'long unsigned int'
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
In file included from /usr/include/c++/14/functional:65,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53:
/usr/include/c++/14/array:390:5: note: candidate: 'template<long unsigned int _Int, class _Tp, long unsigned int _Nm> constexpr _Tp& std::get(array<_Tp, _Nm>&)'
  390 |     get(array<_Tp, _Nm>& __arr) noexcept
      |     ^~~
/usr/include/c++/14/array:390:5: note:   template argument deduction/substitution failed:
a.cc:6:17: error: the value of 'i' is not usable in a constant expression
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
a.cc:4:11: note: 'int i' is not const
    4 |   for(int i=0;i<3;i++){
      |           ^
a.cc:6:17: note: in template argument for type 'long unsigned int'
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
/usr/include/c++/14/array:399:5: note: candidate: 'template<long unsigned int _Int, class _Tp, long unsigned int _Nm> constexpr _Tp&& std::get(array<_Tp, _Nm>&&)'
  399 |     get(array<_Tp, _Nm>&& __arr) noexcept
      |     ^~~
/usr/include/c++/14/array:399:5: note:   template argument deduction/substitution failed:
a.cc:6:17: error: the value of 'i' is not usable in a constant expression
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
a.cc:4:11: note: 'int i' is not const
    4 |   for(int i=0;i<3;i++){
      |           ^
a.cc:6:17: note: in template argument for type 'long unsigned int'
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
/usr/include/c++/14/array:408:5: note: candidate: 'template<long unsigned int _Int, class _Tp, long unsigned int _Nm> constexpr const _Tp& std::get(const array<_Tp, _Nm>&)'
  408 |     get(const array<_Tp, _Nm>& __arr) noexcept
      |     ^~~
/usr/include/c++/14/array:408:5: note:   template argument deduction/substitution failed:
a.cc:6:17: error: the value of 'i' is not usable in a constant expression
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
a.cc:4:11: note: 'int i' is not const
    4 |   for(int i=0;i<3;i++){
      |           ^
a.cc:6:17: note: in template argument for type 'long unsigned int'
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
/usr/include/c++/14/array:417:5: note: candidate: 'template<long unsigned int _Int, class _Tp, long unsigned int _Nm> constexpr const _Tp&& std::get(const array<_Tp, _Nm>&&)'
  417 |     get(const array<_Tp, _Nm>&& __arr) noexcept
      |     ^~~
/usr/include/c++/14/array:417:5: note:   template argument deduction/substitution failed:
a.cc:6:17: error: the value of 'i' is not usable in a constant expression
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
a.cc:4:11: note: 'int i' is not const
    4 |   for(int i=0;i<3;i++){
      |           ^
a.cc:6:17: note: in template argument for type 'long unsigned int'
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
/usr/include/c++/14/bits/stl_pair.h:1272:5: note: candidate: 'template<class _Tp, class _Up> constexpr _Tp& std::get(pair<_T1, _T2>&)'
 1272 |     get(pair<_Tp, _Up>& __p) noexcept
      |     ^~~
/usr/include/c++/14/bits/stl_pair.h:1272:5: note:   template argument deduction/substitution failed:
a.cc:6:17: error: type/value mismatch at argument 1 in template parameter list for 'template<class _Tp, class _Up> constexpr _Tp& std::get(pair<_T1, _T2>&)'
    6 |   cout << get<i>(data) << endl;
      |           ~~~~~~^~~~~~
a.cc:6:17: note:   expected a type, got 'i'
/us