View Compilation Error

0_0_36761712_16046.cpp:33:9: error: '::main' must return 'int'
 ll main()
         ^
0_0_36761712_16046.cpp: In function 'int main()':
0_0_36761712_16046.cpp:113:24: error: 'prllf' was not declared in this scope
         prllf("%d\n", r);
                        ^