View Compilation Error

0_0_15759573_22933.cpp: In function 'int main()':
0_0_15759573_22933.cpp:86:15: error: 'll' was not declared in this scope
       int f=((ll)a*i+b)%(i-1)+1;
               ^
0_0_15759573_22933.cpp:86:18: error: expected ')' before 'a'
       int f=((ll)a*i+b)%(i-1)+1;
                  ^