View Compilation Error

0_0_36087722_6251.cpp:7:11: error: '::main' must return 'int'
 void main() {
           ^
0_0_36087722_6251.cpp: In function 'int main()':
0_0_36087722_6251.cpp:8:31: error: 'memset' was not declared in this scope
     memset(s, false, sizeof(s));
                               ^