View Compilation Error

0_0_33577805_15665.cpp: In function 'ull add()':
0_0_33577805_15665.cpp:9:2: error: 'll' was not declared in this scope
  ll sum=0;
  ^
0_0_33577805_15665.cpp:16:5: error: 'sum' was not declared in this scope
     sum+=f[j];
     ^
0_0_33577805_15665.cpp:19:12: error: 'sum' was not declared in this scope
     return sum;
            ^
0_0_33577805_15665.cpp: In function 'int main()':
0_0_33577805_15665.cpp:31:11: error: 'll' was not declared in this scope
   int Cp=(ll)A*B-C;
           ^