View Compilation Error

0_0_30326605_7514.cpp: In function 'int main()':
0_0_30326605_7514.cpp:18:29: error: 'memset' was not declared in this scope
         memset(h,0,sizeof(h));
                             ^
0_0_30326605_7514.cpp:23:23: error: 'sort' was not declared in this scope
         sort(a+1,a+n+1);
                       ^