View Compilation Error

0_0_29780227_20299.cpp:63:9: error: '::main' must return 'int'
 ll main()
         ^
0_0_29780227_20299.cpp: In function 'int main()':
0_0_29780227_20299.cpp:70:59: error: 'prllf' was not declared in this scope
         prllf("Case #%lld: %lld\n",Case,max((ll)0,s-ask()));
                                                           ^