Got error: solution.cc: In function ‘void printKMax(int*, int, int)’: solution.cc:15:13: error: ‘mydp’ was not declared in this scope mydp.push_front(arr[i]); ^ solution.cc:25:13: error: ‘mydp’ was not declared in this scope mydp.pop_front();

void printKMax(int arr[], int n, int k){ //Write your code here.

deque<int> mydq;
int max = arr[0];
mydq.push_back(arr[0]);
for(int i = 1; i < k; ++i){
    if(arr[i] >= max){
        mydq.push_back(arr[i]);
        max = arr[i];
    }else{
        mydp.push_front(arr[i]);
    }
}
cout << max << " ";

for(int i = k -1; i < n; ++i){
    if(arr[i] > max){
        max = arr[i];
        mydq.push_back(arr[i]);
    }else{
        mydp.pop_front();
        mydq.push_front(arr[i]);
    }
    cout << max << " ";
}

}

why??