View Compilation Error

0_0_36263003_5850.cpp: In function 'int main()':
0_0_36263003_5850.cpp:18:27: error: 'memset' was not declared in this scope
   memset(vis,0,sizeof(vis));
                           ^
0_0_36263003_5850.cpp:27:17: error: 'sort' was not declared in this scope
   sort(a,a+n,cmp);
                 ^