Error: ‘class std::map’ has no member named ‘first’

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C++14

Given an array , we need to output the frequency of all elements of the array.
arr[]= {1,5,1,2,5,2,g}
Output : 1 2
2 2
5 3

What I have tried:

I tried it using unordered_map as follows-

void count(int arr[] , int n){
    map<int ,int>d;
    for(int i=0;i<n ;i++){
        d[arr[i]]++;
    }
    for(auto i : d){
       cout<<d.first<<" "<<d.second<<"\n";
    }
}

Basically I was using map to store the frequencies of elements of array and I tried it on C++14 , but it gives the following error-
error:‘class std::map’ has no member named ‘first’

I think the map has first and second member inbuilt in it, then Why it is giving the error??
If there are any corrections in the code , please let me know.