View Compilation Error

0_0_29677621_19043.cpp: In function 'int main()':
0_0_29677621_19043.cpp:109:27: error: 'll' was not declared in this scope
                 ans=(ans+(ll)last*i)%mod;
                           ^
0_0_29677621_19043.cpp:109:30: error: expected ')' before 'last'
                 ans=(ans+(ll)last*i)%mod;
                              ^