View Compilation Error

0_0_29987158_8609.cpp:40:10: error: '::main' must return 'int'
 int main()
          ^
0_0_29987158_8609.cpp: In function 'int main()':
0_0_29987158_8609.cpp:86:10: error: request for member 'clear' in 'flag', which is of non-class type 'long long int [2000200]'
     flag.clear();
          ^