View Compilation Error

0_0_32886694_10291.cpp: In function 'int main()':
0_0_32886694_10291.cpp:14:32: error: 'scanf_s' was not declared in this scope
  while (scanf_s("%d %d", &m, &n)==2)  //不==2会超时
                                ^
0_0_32886694_10291.cpp:17:31: error: 'memset' was not declared in this scope
   memset(book, 0, sizeof(book));//每次清空图书馆书的状态，均置为未借的状态，值设为0，若有人借了，就把值改为此人的序号
                               ^