View Compilation Error

0_0_38676554_29390.cpp: In function 'int main()':
0_0_38676554_29390.cpp:32:15: error: 'cin' was not declared in this scope
   32 |         while(cin>>n>>m)
      |               ^~~
0_0_38676554_29390.cpp:19:1: note: 'std::cin' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
   18 | #include <wctype.h>　　　　//宽字符分类
  +++ |+#include <iostream>
   19 | using namespace std;
0_0_38676554_29390.cpp:40:17: error: 'sort' was not declared in this scope; did you mean 'sqrt'?
   40 |                 sort(a+1,a+1+n,cmp);
      |                 ^~~~
      |                 sqrt