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#include <bits/stdc++.h>
using namespace std;
 
int main() {
	cout <<"enter array" ;
	map <int , int> arr ;
	cout<<"enter size of array" ;
	int n ;
	cin >> n ;
	int m = n ;
	while(m--)
	{
		int x ;
		cin >> x ;
		arr[x]++ ;
	}
	for(int i = 0 ; i < arr.size() ; i++)
	{
		cout << arr->first <<" has frequency : " << arr->second <<endl;
	}
	return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:19:14: error: base operand of '->' has non-pointer type 'std::map<int, int>'
   cout << arr->first <<" has frequency : " << arr->second <<endl;
              ^
prog.cpp:19:50: error: base operand of '->' has non-pointer type 'std::map<int, int>'
   cout << arr->first <<" has frequency : " << arr->second <<endl;
                                                  ^

Standard output is empty