View Compilation Error

0_0_30572264_23712.cpp:6:10: error: '::main' must return 'int'
 ll  main()
          ^
0_0_30572264_23712.cpp: In function 'int main()':
0_0_30572264_23712.cpp:22:13: error: 'prll' was not declared in this scope
             prll f("Case #%lld: -1\n",T);
             ^
0_0_30572264_23712.cpp:46:13: error: 'prll' was not declared in this scope
             prll f("Case #%d: %lld\n",T,ans);
             ^