View Compilation Error

0_0_39559460_41.cpp: In instantiation of 'solve(long long int)::<lambda(auto:55, long long int, long long int)> [with auto:55 = solve(long long int)::<lambda(auto:55, long long int, long long int)>]':
0_0_39559460_41.cpp:56:12:   required from here
0_0_39559460_41.cpp:55:9: error: no return statement in 'constexpr' function returning non-void
   55 |         };
      |         ^