View Compilation Error

0_0_17252062_28825.cpp:1:12: error: #include expects "FILENAME" or <FILENAME>
 #include   
            ^
0_0_17252062_28825.cpp:2:12: error: #include expects "FILENAME" or <FILENAME>
 #include   
            ^
0_0_17252062_28825.cpp: In function 'int main()':
0_0_17252062_28825.cpp:42:18: error: 'scanf' was not declared in this scope
     scanf("%d",&T);  
                  ^
0_0_17252062_28825.cpp:47:56: error: 'memset' was not declared in this scope
             memset(tree[i].next,-1,sizeof(tree[i].next));  
                                                        ^
0_0_17252062_28825.cpp:51:52: error: 'memset' was not declared in this scope
             memset(phonum[i],'\0',sizeof(phonum[i]));  
                                                    ^
0_0_17252062_28825.cpp:65:26: error: 'printf' was not declared in this scope
             printf("NO\n");  
                          ^
0_0_17252062_28825.cpp:68:27: error: 'printf' was not declared in this scope
             printf("YES\n");  
                           ^