foo.cc: In function 'int main()':
foo.cc:73:58: error: cannot bind non-const lvalue reference of type 'std::vector<long long int>&' to an rvalue of type 'std::vector<long long int>'
   73 |             answer = max(answer, getMaxPathSumFrom(root, vector<ll>(a, a + N + 1)));
      |                                                          ^~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:27:41: note:   initializing argument 2 of 'll getMaxPathSumFrom(int, std::vector<long long int>&)'
   27 | ll getMaxPathSumFrom(int u, vector<ll>& vals) {
      |                             ~~~~~~~~~~~~^~~~