View Compilation Error

0_0_35511284_10505.cpp:12:11: error: '::main' must return 'int'
 void main(){
           ^
0_0_35511284_10505.cpp: In function 'int main()':
0_0_35511284_10505.cpp:13:25: error: 'memset' was not declared in this scope
     memset(s,0,sizeof(s));
                         ^