View Compilation Error

0_0_39073056_1817.cpp: In function 'int haffman(char*)':
0_0_39073056_1817.cpp:7:13: error: 'strlen' was not declared in this scope
    7 |     int len=strlen(x);
      |             ^~~~~~
0_0_39073056_1817.cpp:4:1: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    3 | #include<set>
  +++ |+#include <cstring>
    4 | using namespace std;
0_0_39073056_1817.cpp:10:5: error: 'memset' was not declared in this scope
   10 |     memset(cnt,0,sizeof(cnt));
      |     ^~~~~~
0_0_39073056_1817.cpp:10:5: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?