/in/foo.cc: In function 'int main()':
/in/foo.cc:15:27: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
   15 |         for (int i = 0; i <= strlen(a[x]) - 1; i++) {
      |                         ~~^~~~~~~~~~~~~~~~~~~