View Compilation Error

0_0_39578451_20710.cpp: In instantiation of 'solve()::<lambda(auto:55, int, int)> [with auto:55 = solve()::<lambda(auto:55, int, int)>; Z = Mint<998244353>]':
0_0_39578451_20710.cpp:97:8:   required from here
0_0_39578451_20710.cpp:96:5: error: no return statement in 'constexpr' function returning non-void
   96 |     };
      |     ^