View Compilation Error

0_0_36160713_21884.cpp: In function 'int main()':
0_0_36160713_21884.cpp:8:2: error: 'cin' was not declared in this scope
  cin >> t;
  ^
0_0_36160713_21884.cpp:13:17: error: 'scanf' was not declared in this scope
   scanf("%d", &n);
                 ^
0_0_36160713_21884.cpp:16:16: error: 'sort' was not declared in this scope
   sort(a, a + n);
                ^
0_0_36160713_21884.cpp:18:22: error: 'printf' was not declared in this scope
    printf("%d ", a[j]);
                      ^
0_0_36160713_21884.cpp:19:23: error: 'printf' was not declared in this scope
   printf("%d\n",a[n-1]);
                       ^