View Compilation Error

0_0_34950933_30844.cpp:1:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_34950933_30844.cpp: In function 'int main()':
0_0_34950933_30844.cpp:7:19: error: 'scanf' was not declared in this scope
     scanf("%d", &n);
                   ^
0_0_34950933_30844.cpp:8:13: error: 'getchar' was not declared in this scope
     getchar(); // 接受输入将要输入行数之后的回车键 
             ^
0_0_34950933_30844.cpp:18:31: error: 'printf' was not declared in this scope
         printf("%d\n", sum / 2); // 每个中文占两个字节 
                               ^