View Compilation Error

0_0_31453250_24390.cpp: In function 'int main()':
0_0_31453250_24390.cpp:6:18: error: 'scanf' was not declared in this scope
     scanf("%d",&N);
                  ^
0_0_31453250_24390.cpp:18:28: error: 'printf' was not declared in this scope
             printf("%d\n",s);
                            ^
0_0_31453250_24390.cpp:25:24: error: 'printf' was not declared in this scope
             printf("\n");    //注意：每行的第一个数是0的时候也要换行！
                        ^