/in/foo.cc: In function 'int main()':
/in/foo.cc:8:8: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'long long int [1000][1000]')
    8 |     cin>>a>>b;
      |     ~~~^~~
      |     |    |
      |     |    long long int [1000][1000]
      |     std::istream {aka std::basic_istream<char>}
In file included from /usr/include/c++/12/sstream:38,
                 from /usr/include/c++/12/complex:45,
                 from /usr/include/c++/12/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/12/bits/stdc++.h:54,
                 from /in/foo.cc:1:
/usr/include/c++/12/istream:168:7: 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)
  168 |       operator>>(bool& __n)
      |       ^~~~~~~~
/usr/include/c++/12/istream:168:7: note:   conversion of argument 1 would be ill-formed:
/in/foo.cc:8:10: warning: the address of 'a' will never be NULL [-Waddress]
    8 |     cin>>a>>b;
      |          ^
/in/foo.cc:3:11: note: 'a' declared here
    3 | long long a[1000][1000],b[1000][1000],c[1000][1000];
      |           ^
/in/foo.cc:8:10: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'long long int (*)[1000]'
    8 |     cin>>a>>b;
      |          ^
/usr/include/c++/12/istream:172:7: 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)
  172 |       operator>>(short& __n);
      |       ^~~~~~~~
/usr/include/c++/12/istream:172:7: note:   conversion of argument 1 would be ill-formed:
/in/foo.cc:8:10: error: invalid conversion from 'long long int (*)[1000]' to 'short int' [-fpermissive]
    8 |     cin>>a>>b;
      |          ^
      |          |
      |          long long int (*)[1000]
/in/foo.cc:8:10: error: cannot bind rvalue '(short int)((long long int (*)[1000])(& a))' to 'short int&'
/usr/include/c++/12/istream:175:7: 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)
  175 |       operator>>(unsigned short& __n)
      |       ^~~~~~~~
/usr/include/c++/12/istream:175:7: note:   conversion of argument 1 would be ill-formed:
/in/foo.cc:8:10: error: invalid conversion from 'long long int (*)[1000]' to 'short unsigned int' [-fpermissive]
    8 |     cin>>a>>b;
      |          ^
      |          |
      |          long long int (*)[1000]
/in/foo.cc:8:10: error: cannot bind rvalue '(short unsigned int)((long long int (*)[1000])(& a))' to 'short unsigned int&'
/usr/include/c++/12/istream:179:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  179 |       operator>>(int& __n);
      |       ^~~~~~~~
/usr/include/c++/12/istream:179:7: note:   conversion of argument 1 would be ill-formed:
/in/foo.cc:8:10: error: invalid conversion from 'long long int (*)[1000]' to 'int' [-fpermissive]
    8 |     cin>>a>>b;
      |          ^
      |          |
      |          long long int (*)[1000]
/in/foo.cc:8:10: error: cannot bind rvalue '(int)((long long int (*)[1000])(& a))' to 'int&'
/usr/include/c++/12/istream:182:7: 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)
  182 |       operator>>(unsigned int& __n)
      |       ^~~~~~~~
/usr/include/c++/12/istream:182:7: note:   conversion of argument 1 would be ill-formed:
/in/foo.cc:8:10: error: invalid conversion from 'long long int (*)[1000]' to 'unsigned int' [-fpermissive]
    8 |     cin>>a>>b;
      |          ^
      |          |
      |          long long int (*)[1000]
/in/foo.cc:8:10: error: cannot bind rvalue '(unsigned int)((long long int (*)[1000])(& a))' to 'unsigned int&'
/usr/include/c++/12/istream:186:7: 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)
  186 |       operator>>(long& __n)
      |       ^~~~~~~~
/usr/include/c++/12/istream:186:7: note:   conversion of argument 1 would be ill-formed:
/in/foo.cc:8:10: error: invalid conversion from 'long long int (*)[1000]' to 'long int' [-fpermissive]
    8 |     cin>>a>>b;
      |          ^
      |          |
      |          long long int (*)[1000]
/in/foo.cc:8:10: error: cannot bind rvalue '(long int)((long long int (*)[1000])(& a))' to 'long int&'
/usr/include/c++/12/istream:190:7: 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)
  190 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/usr/include/c++/12/istream:190:7: note:   conversion of argument 1 would be ill-formed:
/in/foo.cc:8:10: error: invalid conversion from 'long long int (*)[1000]' to 'long unsigned int' [-fpermissive]
    8 |     cin>>a>>b;
      |          ^
      |          |
      |          long long int (*)[1000]
/in/foo.cc:8:10: error: cannot bind rvalue '(long unsigned int)((long long int (*)[1000])(& a))' to 'long unsigned int&'
/usr/include/c++/12/istream:195:7: 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)
  195 |       operator>>(long long& __n)
      |       ^~~~~~~~
/usr/include/c++/12/istream:195:7: note:   conversion of argument 1 would be ill-formed:
/in/foo.cc:8:10: error: invalid conversion from 'long long int (*)[1000]' to 'long long int' [-fpermissive]
    8 |     cin>>a>>b;
      |          ^
      |          |
      |          long long int (*)[1000]
/in/foo.cc:8:10: error: cannot bind rvalue '(long long int)((long long int (*)[1000])(& a))' to 'long long int&'
/usr/include/c++/12/istream:199:7: 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)
  199 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/usr/include/c++/12/istream:199:7: note:   conversion of argument 1 would be ill-formed:
/in/foo.cc:8:10: error: invalid conversion from 'long long int (*)[1000]' to 'long long unsigned int' [-fpermissive]
    8 |     cin>>a>>b;
      |          ^
      |          |
      |          long long int (*)[1000]
/in/foo.cc:8:10: error: cannot bind rvalue '(long long unsigned int)((long long int (*)[1000])(& a))' to 'long long unsigned int&'
/usr/include/c++/12/istream:235:7: 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)
  235 |       operator>>(void*& __p)
      |       ^~~~~~~~
/usr/include/c++/12/istream:235:7: note:   conversion of argument 1 would be ill-formed:
/in/foo.cc:8:10: error: cannot bind non-const lvalue reference of type 'void*&' to an rvalue of type 'void*'
    8 |     cin>>a>>b;
      |          ^
/usr/include/c++/12/istream:120:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__istream_type& (*)(__istream_type&)) [with _CharT = char; _Traits