View Compilation Error

0_0_27719601_27828.cpp:27:11: error: '::main' must return 'int'
 void main()
           ^
0_0_27719601_27828.cpp: In function 'int main()':
0_0_27719601_27828.cpp:33:25: error: 'memset' was not declared in this scope
 memset(map,0,sizeof(map));
                         ^