View Compilation Error

0_0_30011375_23622.cpp: In function 'int linear_recurrence(const std::vector<int>&, const std::vector<int>&, long long int)':
0_0_30011375_23622.cpp:333:11: error: 'a' was not declared in this scope
   int m = a.size();
           ^
0_0_30011375_23622.cpp:335:12: error: 'f' was not declared in this scope
     return f[n];
            ^
0_0_30011375_23622.cpp: In lambda function:
0_0_30011375_23622.cpp:354:14: error: unable to deduce lambda return type from 'a'
       return a;
              ^