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int sub_sum(vector<int>& arr, int k) 
{
	int n = arr.size();  
	int tmp = 0;
 
	map<int, int> mp;
	mp[0]++;
 
	int sum = 0;    // instead of prefix sum
	for (int i = 0; i < n; i++)
	{
	    sum += arr[i];
	    tmp += mp[sum - k];
	    mp[sum]++;
	}
	return tmp;
}

prog.cpp:1:13: error: ‘vector’ was not declared in this scope
 int sub_sum(vector<int>& arr, int k)
             ^~~~~~
prog.cpp:1:20: error: expected primary-expression before ‘int’
 int sub_sum(vector<int>& arr, int k)
                    ^~~
prog.cpp:1:31: error: expected primary-expression before ‘int’
 int sub_sum(vector<int>& arr, int k)
                               ^~~
prog.cpp:1:36: error: expression list treated as compound expression in initializer [-fpermissive]
 int sub_sum(vector<int>& arr, int k)
                                    ^

Standard output is empty