View Compilation Error

0_0_39158681_10525.cpp: In function 'int main()':
0_0_39158681_10525.cpp:29:27: error: 'strlen' was not declared in this scope
   29 |                 int lon = strlen(a);
      |                           ^~~~~~
0_0_39158681_10525.cpp:4:1: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    3 | #include<vector>
  +++ |+#include <cstring>
    4 |