View Compilation Error

0_0_34968306_30582.cpp: In member function 'll linear::kth(ll)':
0_0_34968306_30582.cpp:45:19: error: 'vec' was not declared in this scope
   if(k>(1ll<<(int)vec.size())) return -1;
                   ^
0_0_34968306_30582.cpp:46:22: error: 'vec' was not declared in this scope
   for(int i=0;i<(int)vec.size();i++) if(k&(1ll<<i)) ans^=p[i];
                      ^
0_0_34968306_30582.cpp:46:53: error: 'ans' was not declared in this scope
   for(int i=0;i<(int)vec.size();i++) if(k&(1ll<<i)) ans^=p[i];
                                                     ^
0_0_34968306_30582.cpp:47:10: error: 'ans' was not declared in this scope
   return ans;
          ^