foo.cc: In function 'int Init(char*, int*)':
foo.cc:9:17: error: 'strlen' was not declared in this scope
    9 |         int n = strlen(s);
      |                 ^~~~~~
foo.cc:3:1: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    2 | #include <string>
  +++ |+#include <cstring>
    3 | using namespace std;

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