View Compilation Error

0_0_39450771_10383.cpp: In function 'void solve()':
0_0_39450771_10383.cpp:42:5: error: 'set' was not declared in this scope
   42 |     set<ull> A;
      |     ^~~
0_0_39450771_10383.cpp:4:1: note: 'std::set' is defined in header '<set>'; did you forget to '#include <set>'?
    3 | #include <unordered_set>
  +++ |+#include <set>
    4 | using namespace std;
0_0_39450771_10383.cpp:42:12: error: expected primary-expression before '>' token
   42 |     set<ull> A;
      |            ^
0_0_39450771_10383.cpp:42:14: error: 'A' was not declared in this scope
   42 |     set<ull> A;
      |              ^