View Compilation Error

0_0_37873176_14944.cpp: In function 'int main()':
0_0_37873176_14944.cpp:85:47: error: invalid initialization of reference of type 'std::deque<int>&' from expression of type 'std::deque<long long int>'
             lft -= pop(d, lft, 0, d.size() - 1);
                                               ^
0_0_37873176_14944.cpp:41:5: note: in passing argument 1 of 'int pop(std::deque<int>&, int&, int, int)'
 int pop(deque<int>& d, int& lft, int f, int t)
     ^