View Compilation Error

0_0_18425283_29881.cpp:5:11: error: '::main' must return 'int'
 void main(){
           ^
0_0_18425283_29881.cpp: In function 'int main()':
0_0_18425283_29881.cpp:9:29: error: 'memset' was not declared in this scope
   memset(cell,0,sizeof(cell));
                             ^