View Compilation Error

0_0_32043856_30849.cpp: In function 'int main()':
0_0_32043856_30849.cpp:32:9: error: 'ull' was not declared in this scope
         ull ans=1;
         ^
0_0_32043856_30849.cpp:35:9: error: 'ans' was not declared in this scope
         ans=ull(ans)*i%mod;
         ^
0_0_32043856_30849.cpp:36:23: error: 'ans' was not declared in this scope
         printf("%d\n",ans);
                       ^