View Compilation Error

0_0_32864193_19717.cpp: In function 'int main()':
0_0_32864193_19717.cpp:15:18: error: 'scanf' was not declared in this scope
     scanf("%d",&T);
                  ^
0_0_32864193_19717.cpp:23:23: error: 'sort' was not declared in this scope
         sort(d,d+n,cmp);
                       ^
0_0_32864193_19717.cpp:28:36: error: 'max' was not declared in this scope
             ans=max(time+d[i].t,ans);
                                    ^
0_0_32864193_19717.cpp:30:38: error: 'printf' was not declared in this scope
         printf("Case %d: %d\n",ca,ans);
                                      ^