View Compilation Error

0_0_30427835_3621.cpp: In function '__int128 cf(__int128, __int128, __int128)':
0_0_30427835_3621.cpp:38:5: error: 'int128' was not declared in this scope
     int128 s1=n*n*n*b+(n-1)*n*n*a;
     ^
0_0_30427835_3621.cpp:41:16: error: 's1' was not declared in this scope
         return s1;
                ^
0_0_30427835_3621.cpp:43:12: error: expected ';' before 's2'
     int128 s2=18*(n/2)*(n/2)*a+7*cf(n/2, a, b);
            ^
0_0_30427835_3621.cpp:45:16: error: 's1' was not declared in this scope
     return min(s1, s2);
                ^
0_0_30427835_3621.cpp:45:20: error: 's2' was not declared in this scope
     return min(s1, s2);
                    ^