View Compilation Error

0_0_15794433_25661.cpp:1:10: error: #include expects "FILENAME" or <FILENAME>
 #include 
          ^
0_0_15794433_25661.cpp:2:10: error: #include expects "FILENAME" or <FILENAME>
 #include 
          ^
0_0_15794433_25661.cpp:3:10: error: #include expects "FILENAME" or <FILENAME>
 #include 
          ^
0_0_15794433_25661.cpp: In function 'int main()':
0_0_15794433_25661.cpp:10:34: error: 'scanf' was not declared in this scope
     while (scanf("%lf%lf", &x, &y) == 2) {
                                  ^
0_0_15794433_25661.cpp:13:26: error: 'printf' was not declared in this scope
             printf("-1\n");
                          ^
0_0_15794433_25661.cpp:29:27: error: 'printf' was not declared in this scope
         printf("%d\n", cnt);
                           ^