Language: C++

#include<bits/stdc++.h>
using namespace std;
int n,a,k,x[17];
bool f[17];
int sum=0;
void dfs(int dep)
{
	if(dep==k+1)
		int ans=0;
	for(int i=1;i<=k;i++)
	{
		ans+=x[a[i]];
	}
	if(ans==k*a) sum++;
	else
	{
		for(int j=i;j<=n;j++)
		{
			if(f[i]==0&&a[dep-1]<i)
			{
				a[dep]=i;
				f[i]=1;
				dfs(dep+1);
				f[i]=0;
			}
		}
	}		
}
int main()
{
	int n,a,x[16];
	cin>>n>>a;
	cin>>x;
	for(int i=1;i<=n;i++)
	{
		k=i;
		dfs(1);
	}
	cout<<sum;
	
	return 0;
}



Compiler output:
a.cc: In function 'void dfs(int)':
a.cc:12:17: error: 'ans' was not declared in this scope; did you mean 'abs'?
   12 |                 ans+=x[a[i]];
      |                 ^~~
      |                 abs
a.cc:12:25: error: invalid types 'int[int]' for array subscript
   12 |                 ans+=x[a[i]];
      |                         ^
a.cc:14:12: error: 'ans' was not declared in this scope; did you mean 'abs'?
   14 |         if(ans==k*a) sum++;
      |            ^~~
      |            abs
a.cc:17:27: error: 'i' was not declared in this scope
   17 |                 for(int j=i;j<=n;j++)
      |                           ^
a.cc:19:38: error: invalid types 'int[int]' for array subscript
   19 |                         if(f[i]==0&&a[dep-1]<i)
      |                                      ^
a.cc:21:34: error: invalid types 'int[int]' for array subscript
   21 |                                 a[dep]=i;
      |                                  ^
a.cc: In function 'int main()':
a.cc:33:12: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'int [16]')
   33 |         cin>>x;
      |         ~~~^~~
      |         |    |
      |         |    int [16]
      |         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:33:14: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'int*'
   33 |         cin>>x;
      |              ^
/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:33:14: error: invalid conversion from 'int*' to 'short int' [-fpermissive]
   33 |         cin>>x;
      |              ^
      |              |
      |              int*
a.cc:33:14: error: cannot bind rvalue '(short int)((int*)(& x))' 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:33:14: error: invalid conversion from 'int*' to 'short unsigned int' [-fpermissive]
   33 |         cin>>x;
      |              ^
      |              |
      |              int*
a.cc:33:14: error: cannot bind rvalue '(short unsigned int)((int*)(& x))' 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:33:14: error: invalid conversion from 'int*' to 'int' [-fpermissive]
   33 |         cin>>x;
      |              ^
      |              |
      |              int*
a.cc:33:14: error: cannot bind rvalue '(int)((int*)(& x))' 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:33:14: error: invalid conversion from 'int*' to 'unsigned int' [-fpermissive]
   33 |         cin>>x;
      |              ^
      |              |
      |              int*
a.cc:33:14: error: cannot bind rvalue '(unsigned int)((int*)(& x))' 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:33:14: error: invalid conversion from 'int*' to 'long int' [-fpermissive]
   33 |         cin>>x;
      |              ^
      |              |
      |              int*
a.cc:33:14: error: cannot bind rvalue '(long int)((int*)(& x))' 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:33:14: error: invalid conversion from 'int*' to 'long unsigned int' [-fpermissive]
   33 |         cin>>x;
      |              ^
      |              |
      |              int*
a.cc:33:14: error: cannot bind rvalue '(long unsigned int)((int*)(& x))' 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:33:14: error: invalid conversion from 'int*' to 'long long int' [-fpermissive]
   33 |         cin>>x;
      |              ^
      |              |
      |              int*
a.cc:33:14: error: cannot bind rvalue '(long long int)((int*)(& x))' 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:33:14: error: invalid conversion from 'int*' to 'long long unsigned int' [-fpermissive]
   33 |         cin>>x;
      |              ^
      |              |
      |              int*
a.cc:33:14: error: cannot bind rvalue '(long long unsigned int)((int*)(& x))' 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:33:14: error: cannot bind non-const lvalue reference of type 'void*&' to an rvalue of type 'void*'
   33 |         cin>>x;
      |              ^
/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 [16]' 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 [16]' 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 [16]' 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 [16]' to 'std::basic_istr