Language: C++

#include <bits/stdc++.h>
using namespace std;

int main()
{
	long long n, m, c, s=c, sg=0;
	cin >> n >> m >> c;
	long long b[m+1], a[n+1][m+1];
	
	for(int i=1; i<=n+1; i++)
	{
		if(i==1)
		{
			for(int j=1; j<=m; j++)
				cin >> b[j];
		}	
		else
		{
			for(int j=1; j<=m; j++)
			{
				cin >> a[j];
				s += a[j][i]*b[j];
			}
			if(s>0)	sg++;
			s = 0;
		}    
	}
	cout << sg;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:37: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'long long int [(m + 1)]')
   21 |                                 cin >> a[j];
      |                                 ~~~ ^~ ~~~~
      |                                 |         |
      |                                 |         long long int [(m + 1)]
      |                                 std::istream {aka std::basic_istream<char>}
In file included from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127,
                 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:21:43: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'long long int*'
   21 |                                 cin >> a[j];
      |                                        ~~~^
/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:21:43: error: invalid conversion from 'long long int*' to 'short int' [-fpermissive]
   21 |                                 cin >> a[j];
      |                                        ~~~^
      |                                           |
      |                                           long long int*
a.cc:21:43: error: cannot bind rvalue '(short int)((long long int*)(& a[j]))' 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:21:43: error: invalid conversion from 'long long int*' to 'short unsigned int' [-fpermissive]
   21 |                                 cin >> a[j];
      |                                        ~~~^
      |                                           |
      |                                           long long int*
a.cc:21:43: error: cannot bind rvalue '(short unsigned int)((long long int*)(& a[j]))' 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:21:43: error: invalid conversion from 'long long int*' to 'int' [-fpermissive]
   21 |                                 cin >> a[j];
      |                                        ~~~^
      |                                           |
      |                                           long long int*
a.cc:21:43: error: cannot bind rvalue '(int)((long long int*)(& a[j]))' 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:21:43: error: invalid conversion from 'long long int*' to 'unsigned int' [-fpermissive]
   21 |                                 cin >> a[j];
      |                                        ~~~^
      |                                           |
      |                                           long long int*
a.cc:21:43: error: cannot bind rvalue '(unsigned int)((long long int*)(& a[j]))' 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:21:43: error: invalid conversion from 'long long int*' to 'long int' [-fpermissive]
   21 |                                 cin >> a[j];
      |                                        ~~~^
      |                                           |
      |                                           long long int*
a.cc:21:43: error: cannot bind rvalue '(long int)((long long int*)(& a[j]))' 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:21:43: error: invalid conversion from 'long long int*' to 'long unsigned int' [-fpermissive]
   21 |                                 cin >> a[j];
      |                                        ~~~^
      |                                           |
      |                                           long long int*
a.cc:21:43: error: cannot bind rvalue '(long unsigned int)((long long int*)(& a[j]))' 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:21:43: error: invalid conversion from 'long long int*' to 'long long int' [-fpermissive]
   21 |                                 cin >> a[j];
      |                                        ~~~^
      |                                           |
      |                                           long long int*
a.cc:21:43: error: cannot bind rvalue '(long long int)((long long int*)(& a[j]))' 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:21:43: error: invalid conversion from 'long long int*' to 'long long unsigned int' [-fpermissive]
   21 |                                 cin >> a[j];
      |                                        ~~~^
      |                                           |
      |                                           long long int*
a.cc:21:43: error: cannot bind rvalue '(long long unsigned int)((long long int*)(& a[j]))' 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:21:43: error: cannot bind non-const lvalue reference of type 'void*&' to an rvalue of type 'void*'
   21 |                                 cin >> a[j];
      |                                        ~~~^
/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 'long long 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 'long long 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 'long long int [(m + 1)]' to 'long double&'
  227 |