foo.cpp:1:1: error: 'include' does not name a type
 include<iostream> include<string.h>
 ^
foo.cpp: In function 'int main()':
foo.cpp:8:1: error: 'cin' was not declared in this scope
 cin >> size;
 ^
foo.cpp:10:27: error: 'memset' was not declared in this scope
 memset(has, 0, sizeof(has));
                           ^
foo.cpp:27:1: error: 'cout' was not declared in this scope
 cout << ans << endl;
 ^
foo.cpp:27:16: error: 'endl' was not declared in this scope
 cout << ans << endl;
                ^