View Compilation Error

0_0_38942862_1355.cpp: In function 'int main()':
0_0_38942862_1355.cpp:24:17: error: 'sort' was not declared in this scope; did you mean 'short'?
   24 |                 sort(a+1,a+n+1,cmp);//从大到小
      |                 ^~~~
      |                 short
0_0_38942862_1355.cpp:27:33: error: 'memset' was not declared in this scope
   27 |                                 memset(vis,0,sizeof(vis));
      |                                 ^~~~~~
0_0_38942862_1355.cpp:2:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    1 | #include <iostream>
  +++ |+#include <cstring>
    2 | using namespace std;