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[M+1], Y[M+1];

    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;
        int j=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++;
            }
        }

        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:25:13: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'int [(M + 1)]')
   25 |         cin >> P >> Y;
      |         ~~~ ^~ ~
      |         |      |
      |         |      int [(M + 1)]
      |         std::istream {aka std::basic_istream<char>}
In file included from /usr/include/c++/14/iostream:42,
                 from a.cc:1:
/usr/include/c++/14/istream:170:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  170 |       operator>>(bool& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:170:7: note:   conversion of argument 1 would be ill-formed:
a.cc:25:16: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'int*'
   25 |         cin >> P >> Y;
      |                ^
/usr/include/c++/14/istream:174:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  174 |       operator>>(short& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:174:7: note:   conversion of argument 1 would be ill-formed:
a.cc:25:16: error: invalid conversion from 'int*' to 'short int' [-fpermissive]
   25 |         cin >> P >> Y;
      |                ^
      |                |
      |                int*
a.cc:25:16: error: cannot bind rvalue '(short int)((int*)(& P))' to 'short int&'
/usr/include/c++/14/istream:177:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  177 |       operator>>(unsigned short& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:177:7: note:   conversion of argument 1 would be ill-formed:
a.cc:25:16: error: invalid conversion from 'int*' to 'short unsigned int' [-fpermissive]
   25 |         cin >> P >> Y;
      |                ^
      |                |
      |                int*
a.cc:25:16: error: cannot bind rvalue '(short unsigned int)((int*)(& P))' to 'short unsigned int&'
/usr/include/c++/14/istream:181:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  181 |       operator>>(int& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:181:7: note:   conversion of argument 1 would be ill-formed:
a.cc:25:16: error: invalid conversion from 'int*' to 'int' [-fpermissive]
   25 |         cin >> P >> Y;
      |                ^
      |                |
      |                int*
a.cc:25:16: error: cannot bind rvalue '(int)((int*)(& P))' to 'int&'
/usr/include/c++/14/istream:184:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  184 |       operator>>(unsigned int& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:184:7: note:   conversion of argument 1 would be ill-formed:
a.cc:25:16: error: invalid conversion from 'int*' to 'unsigned int' [-fpermissive]
   25 |         cin >> P >> Y;
      |                ^
      |                |
      |                int*
a.cc:25:16: error: cannot bind rvalue '(unsigned int)((int*)(& P))' to 'unsigned int&'
/usr/include/c++/14/istream:188:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  188 |       operator>>(long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:188:7: note:   conversion of argument 1 would be ill-formed:
a.cc:25:16: error: invalid conversion from 'int*' to 'long int' [-fpermissive]
   25 |         cin >> P >> Y;
      |                ^
      |                |
      |                int*
a.cc:25:16: error: cannot bind rvalue '(long int)((int*)(& P))' to 'long int&'
/usr/include/c++/14/istream:192:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  192 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:192:7: note:   conversion of argument 1 would be ill-formed:
a.cc:25:16: error: invalid conversion from 'int*' to 'long unsigned int' [-fpermissive]
   25 |         cin >> P >> Y;
      |                ^
      |                |
      |                int*
a.cc:25:16: error: cannot bind rvalue '(long unsigned int)((int*)(& P))' to 'long unsigned int&'
/usr/include/c++/14/istream:199:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  199 |       operator>>(long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:199:7: note:   conversion of argument 1 would be ill-formed:
a.cc:25:16: error: invalid conversion from 'int*' to 'long long int' [-fpermissive]
   25 |         cin >> P >> Y;
      |                ^
      |                |
      |                int*
a.cc:25:16: error: cannot bind rvalue '(long long int)((int*)(& P))' to 'long long int&'
/usr/include/c++/14/istream:203:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  203 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:203:7: note:   conversion of argument 1 would be ill-formed:
a.cc:25:16: error: invalid conversion from 'int*' to 'long long unsigned int' [-fpermissive]
   25 |         cin >> P >> Y;
      |                ^
      |                |
      |                int*
a.cc:25:16: error: cannot bind rvalue '(long long unsigned int)((int*)(& P))' to 'long long unsigned int&'
/usr/include/c++/14/istream:328:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  328 |       operator>>(void*& __p)
      |       ^~~~~~~~
/usr/include/c++/14/istream:328:7: note:   conversion of argument 1 would be ill-formed:
a.cc:25:16: error: cannot bind non-const lvalue reference of type 'void*&' to an rvalue of type 'void*'
   25 |         cin >> P >> Y;
      |                ^
/usr/include/c++/14/istream:219:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(float&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  219 |       operator>>(float& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:219:25: note:   no known conversion for argument 1 from 'int [(M + 1)]' to 'float&'
  219 |       operator>>(float& __f)
      |                  ~~~~~~~^~~
/usr/include/c++/14/istream:223:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  223 |       operator>>(double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:223:26: note:   no known conversion for argument 1 from 'int [(M + 1)]' to 'double&'
  223 |       operator>>(double& __f)
      |                  ~~~~~~~~^~~
/usr/include/c++/14/istream:227:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  227 |       operator>>(long double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:227:31: note:   no known conversion for argument 1 from 'int [(M + 1)]' to 'long double&'
  227 |       operator>>(long double& __f)
      |                  ~~~~~~~~~~~~~^~~
/usr/include/c++/14/istream:122:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__istream_type& (*)(__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:122:36: note:   no known conversion for argument 1 from 'int [(M + 1)]' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'}
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |                  ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/istream:126:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__ios_type& (*)(__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>; __ios_type = std::basic_ios<char>]'
  126 |       operator>>(__ios_type& (*__pf)(__ios_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:126:32: note:   no known conversion for argument 1 from 'int [(M + 1)]' to 'std::basic_istream<char>::__ios_type& (*)(std::basic_istream<char>::__ios_type&)' {aka 'std::basic_ios<char>& (*)(std::basic_ios<char>&)'}
  126 |       operator>>(__ios_type& (*__pf)(__ios_type&))
      |