View Compilation Error

0_0_37440630_14362.cpp: In function 'long long int f(int)':
0_0_37440630_14362.cpp:10:2: error: 'll' was not declared in this scope
  ll res = 1;
  ^
0_0_37440630_14362.cpp:13:3: error: 'res' was not declared in this scope
   res *= i;
   ^
0_0_37440630_14362.cpp:15:9: error: 'res' was not declared in this scope
  return res;
         ^