View Compilation Error

0_0_31957520_22117.cpp: In function 'int main()':
0_0_31957520_22117.cpp:7:31: error: 'scanf' was not declared in this scope
     while((scanf("%d %d",&n,&m)!=EOF)&&(n||m))
                               ^
0_0_31957520_22117.cpp:7:34: error: 'EOF' was not declared in this scope
     while((scanf("%d %d",&n,&m)!=EOF)&&(n||m))
                                  ^
0_0_31957520_22117.cpp:27:13: error: 'sort' was not declared in this scope
   sort(a,a+n);
             ^
0_0_31957520_22117.cpp:34:17: error: 'printf' was not declared in this scope
   printf("%d ",0);
                 ^
0_0_31957520_22117.cpp:39:22: error: 'printf' was not declared in this scope
     printf("%d ",a[i]);
                      ^
0_0_31957520_22117.cpp:43:29: error: 'printf' was not declared in this scope
   if(flag==1)  printf("NULL");
                             ^
0_0_31957520_22117.cpp:44:14: error: 'printf' was not declared in this scope
   printf("\n");
              ^