View Compilation Error

0_0_30399881_31418.cpp: In function 'int main()':
0_0_30399881_31418.cpp:44:37: error: 'memset' was not declared in this scope
         memset(vist, 0, sizeof(vist));
                                     ^
0_0_30399881_31418.cpp:45:29: error: 'sort' was not declared in this scope
         sort(arr, arr+n, cmp);
                             ^