View Compilation Error

0_0_14520721_19292.cpp:1:10: error: #include expects "FILENAME" or <FILENAME>
 #include 
          ^
0_0_14520721_19292.cpp: In function 'int main()':
0_0_14520721_19292.cpp:22:24: error: 'scanf' was not declared in this scope
     while(scanf("%d",&n) != EOF) {
                        ^
0_0_14520721_19292.cpp:22:29: error: 'EOF' was not declared in this scope
     while(scanf("%d",&n) != EOF) {
                             ^
0_0_14520721_19292.cpp:27:23: error: 'sort' was not declared in this scope
         sort(s,s+n,cmp);
                       ^
0_0_14520721_19292.cpp:28:62: error: 'printf' was not declared in this scope
         for(int i = 0 ; i < n-1 ; i ++) printf("%d ",s[i].num);
                                                              ^
0_0_14520721_19292.cpp:29:33: error: 'printf' was not declared in this scope
         printf("%d\n",s[n-1].num);
                                 ^