View Compilation Error

0_0_29397197_17424.cpp: In function 'int main()':
0_0_29397197_17424.cpp:30:66: error: invalid initialization of non-const reference of type 'std::vector<int>&' from an rvalue of type 'std::vector<int>'
   auto temp = add(f[i - 1], add(f[i - 2], add(f[i - 3], f[i - 4])));
                                                                  ^
0_0_29397197_17424.cpp:10:13: note: in passing argument 2 of 'std::vector<int> add(std::vector<int>&, std::vector<int>&)'
 vector<int> add(vector<int> &A, vector<int> &B) {
             ^