Language: C++

#include <iostream>
#include <algorithm>
#include <cstdlib>  // abs() for integer
#include <vector>
#include <ios>     // std::left, std::right
#include <iomanip> // std::setw(int), std::setfill(char)
using namespace std;



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

    int N,M;
    cin >> N >> M;

    int P, Y;

//    vector<pair<int, int> > pairs(M+1);
    vector<pair<int, int> > original_pairs(M+1);

    pairs[0] = make_pair(-1, -1);
    for(int i=1; i<M+1; i++){
        cin >> P >> Y;
        pairs[i] = make_pair(P, Y);
        original_pairs[i] = make_pair(P, Y);
    }

//    sort(pairs.begin(), pairs.end());

    for(int i=1; i<M+1; i++){
        //　何番か求める
        int num = 0;
//        for(int tmp=1; tmp<M+1; tmp++){
//            if(pairs[tmp].first == original_pairs[i].first && pairs[tmp].second == original_pairs[i].second){
//                j=tmp;
//                break;
//            }
//        }

//        for(int k=1; k<=j; k++){
//            if(pairs[k].first == pairs[j].first){
//                num++;
//            }
//        }
        for(int j=1; j<M+1; j++){
            if(original_pairs[i].first == original_pairs[j] && original_pairs[i].second > original_pairs[j].second){
                num++;
            }
        }

        cout  << setfill('0') << setw(6) << original_pairs[i].first << setfill('0') << setw(6) << num << '\n';
    }




}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:5: error: 'pairs' was not declared in this scope
   23 |     pairs[0] = make_pair(-1, -1);
      |     ^~~~~
a.cc:48:40: error: no match for 'operator==' (operand types are 'int' and '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, int> >, std::pair<int, int> >::value_type' {aka 'std::pair<int, int>'})
   48 |             if(original_pairs[i].first == original_pairs[j] && original_pairs[i].second > original_pairs[j].second){
In file included from /usr/include/c++/14/iosfwd:42,
                 from /usr/include/c++/14/ios:40,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/postypes.h:192:5: note: candidate: 'template<class _StateT> bool std::operator==(const fpos<_StateT>&, const fpos<_StateT>&)'
  192 |     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/postypes.h:192:5: note:   template argument deduction/substitution failed:
a.cc:48:59: note:   mismatched types 'const std::fpos<_StateT>' and 'int'
   48 |             if(original_pairs[i].first == original_pairs[j] && original_pairs[i].second > original_pairs[j].second){
      |                                                           ^
In file included from /usr/include/c++/14/string:43,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44:
/usr/include/c++/14/bits/allocator.h:235:5: note: candidate: 'template<class _T1, class _T2> bool std::operator==(const allocator<_CharT>&, const allocator<_T2>&)'
  235 |     operator==(const allocator<_T1>&, const allocator<_T2>&)
      |     ^~~~~~~~
/usr/include/c++/14/bits/allocator.h:235:5: note:   template argument deduction/substitution failed:
a.cc:48:59: note:   mismatched types 'const std::allocator<_CharT>' and 'int'
   48 |             if(original_pairs[i].first == original_pairs[j] && original_pairs[i].second > original_pairs[j].second){
      |                                                           ^
In file included from /usr/include/c++/14/string:48:
/usr/include/c++/14/bits/stl_iterator.h:441:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  441 |     operator==(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:441:5: note:   template argument deduction/substitution failed:
a.cc:48:59: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'int'
   48 |             if(original_pairs[i].first == original_pairs[j] && original_pairs[i].second > original_pairs[j].second){
      |                                                           ^
/usr/include/c++/14/bits/stl_iterator.h:486:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  486 |     operator==(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:486:5: note:   template argument deduction/substitution failed:
a.cc:48:59: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'int'
   48 |             if(original_pairs[i].first == original_pairs[j] && original_pairs[i].second > original_pairs[j].second){
      |                                                           ^
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1667 |     operator==(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note:   template argument deduction/substitution failed:
a.cc:48:59: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'int'
   48 |             if(original_pairs[i].first == original_pairs[j] && original_pairs[i].second > original_pairs[j].second){
      |                                                           ^
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1737 |     operator==(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note:   template argument deduction/substitution failed:
a.cc:48:59: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'int'
   48 |             if(original_pairs[i].first == original_pairs[j] && original_pairs[i].second > original_pairs[j].second){
      |                                                           ^
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/string:51:
/usr/include/c++/14/bits/stl_pair.h:1033:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1033 |     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1033:5: note:   template argument deduction/substitution failed:
a.cc:48:59: note:   mismatched types 'const std::pair<_T1, _T2>' and 'int'
   48 |             if(original_pairs[i].first == original_pairs[j] && original_pairs[i].second > original_pairs[j].second){
      |                                                           ^
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54:
/usr/include/c++/14/string_view:629:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  629 |     operator==(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:629:5: note:   template argument deduction/substitution failed:
a.cc:48:59: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'int'
   48 |             if(original_pairs[i].first == original_pairs[j] && original_pairs[i].second > original_pairs[j].second){
      |                                                           ^
/usr/include/c++/14/string_view:637:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  637 |     operator==(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:637:5: note:   template argument deduction/substitution failed:
a.cc:48:59: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'int'
   48 |             if(original_pairs[i].first == original_pairs[j] && original_pairs[i].second > original_pairs[j].second){
      |                                                           ^
/usr/include/c++/14/string_view:644:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(__type_identity_t<basic_string_view<_CharT, _Traits> >, basic_string_view<_CharT, _Traits>)'
  644 |     operator==(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:644:5: note:   template argument deduction/substitution failed:
a.cc:48:59: note:   'std::pair<int, int>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   48 |             if(original_pairs[i].first == original_pairs[j] && original_pairs[i].second > original_pairs[j].second){
      |                                                           ^
/usr/include/c++/14/bits/basic_string.h:3755:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3755 |     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3755:5: note:   template argument deduction/substitution failed:
a.cc:48:59: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   48 |             if(original_pairs[i].first == original_pairs[j] && original_pairs[i].second > original_pairs[j].second){
      |                                                           ^
/usr/include/c++/14/bits/basic_string.h:3772:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3772 |     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3772:5: note:   template argument deduction/substitution failed:
a.cc:48:59: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   48 |             if(original_pairs[i].first == original_pairs[j] && original_pairs[i].second > original_pairs[j].second){
      |                                                           ^
/usr/include/c++/14/bits/basic_string.h:3819:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3819 |     operator==(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3819:5: note:   template argument deduction/substitution failed:
a.cc:48:59: note:   mismatched types 'const _CharT*' and 'int'
   48 |             if(original_pairs[i].first == original_pairs[j] && original_pairs[i].second > original_pairs[j].second){
      |                                                           ^
In file included from /usr/include/c++/14/bits/memory_resource.h:47,
                 from /usr/include/c++/14/string:68:
/usr/include/c++/14/tuple:2558:5: note: candidate: 'template<class ... _TElements, class ... _UElements> constexpr bool std::operato