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0_0_37453499_20888.cpp: In function 'constexpr ll cfloor(long double)':
0_0_37453499_20888.cpp:51:1: error: body of constexpr function 'constexpr ll cfloor(long double)' not a return-statement
 }
 ^
0_0_37453499_20888.cpp: In function 'constexpr ll cceil(long double)':
0_0_37453499_20888.cpp:56:1: error: body of constexpr function 'constexpr ll cceil(long double)' not a return-statement
 }
 ^
0_0_37453499_20888.cpp: In function 'constexpr ll mpow(ll, ll, ll)':
0_0_37453499_20888.cpp:70:1: error: body of constexpr function 'constexpr ll mpow(ll, ll, ll)' not a return-statement
 }
 ^
0_0_37453499_20888.cpp: In function 'constexpr int log2n(ull)':
0_0_37453499_20888.cpp:88:1: error: body of constexpr function 'constexpr int log2n(ull)' not a return-statement
 }
 ^