View Compilation Error

0_0_36087751_20083.cpp:5:11: error: '::main' must return 'int'
 void main(){
           ^
0_0_36087751_20083.cpp: In function 'int main()':
0_0_36087751_20083.cpp:66:34: error: 'memset' was not declared in this scope
         memset(tt,true,sizeof(tt));
                                  ^