View Compilation Error

0_0_39832082_20645.cpp: In function 'bool judge(int)':
0_0_39832082_20645.cpp:11:30: error: 'sqrt' was not declared in this scope
   11 |         for (int i = 2; i <= sqrt(key); i++) {
      |                              ^~~~
0_0_39832082_20645.cpp: In function 'int main()':
0_0_39832082_20645.cpp:40:17: error: 'memset' was not declared in this scope
   40 |                 memset(map, 0, sizeof(map));
      |                 ^~~~~~
0_0_39832082_20645.cpp:3:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    2 | #include<algorithm>
  +++ |+#include <cstring>
    3 | using namespace std;