View Compilation Error

0_0_30594082_356.cpp:7:11: error: '::main' must return 'int'
 void main(){
           ^
0_0_30594082_356.cpp: In function 'int main()':
0_0_30594082_356.cpp:8:29: error: 'memset' was not declared in this scope
     memset(s,false,sizeof(s));
                             ^