View Compilation Error

0_0_32418081_22532.cpp: In function '__int128 solve(__int128)':
0_0_32418081_22532.cpp:17:5: error: '_int128' was not declared in this scope
     _int128 res=n*n*n*b+(n-1)*n*n*a;
     ^
0_0_32418081_22532.cpp:18:15: error: 'res' was not declared in this scope
     if(n%2==0)res=min(res,18*(n/2)*(n/2)*a+7*solve(n/2);
               ^
0_0_32418081_22532.cpp:18:56: error: expected ')' before ';' token
     if(n%2==0)res=min(res,18*(n/2)*(n/2)*a+7*solve(n/2);
                                                        ^
0_0_32418081_22532.cpp:19:12: error: 'res' was not declared in this scope
     return res%mod;
            ^
0_0_32418081_22532.cpp: In function 'int main()':
0_0_32418081_22532.cpp:30:32: error: invalid operands of types '__int128' and '<unresolved overloaded function type>' to binary 'operator<<'
           cout<<(ll)(solve(n)<<endl;
                                ^
0_0_32418081_22532.cpp:30:36: error: expected ')' before ';' token
           cout<<(ll)(solve(n)<<endl;
                                    ^