View Compilation Error

0_0_26608399_29326.cpp:1:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_26608399_29326.cpp:2:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_26608399_29326.cpp:3:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_26608399_29326.cpp:4:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_26608399_29326.cpp: In function 'int main()':
0_0_26608399_29326.cpp:15:35: error: 'scanf' was not declared in this scope
  while(scanf("%lld %d %d",&n,&a,&b)!=-1){
                                   ^
0_0_26608399_29326.cpp:7:36: error: 'memset' was not declared in this scope
 #define clr(a) memset(a,0,sizeof(a))
                                    ^
0_0_26608399_29326.cpp:16:3: note: in expansion of macro 'clr'
   clr(r);
   ^
0_0_26608399_29326.cpp:20:24: error: 'printf' was not declared in this scope
   printf("Case %d:",++f);
                        ^
0_0_26608399_29326.cpp:22:15: error: 'putchar' was not declared in this scope
   putchar('\n');
               ^