foo.cc: In function 'int main()':
foo.cc:17:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
17 | for (int i = 0; i < all.size(); i++)
| ~~^~~~~~~~~~~~
foo.cc:29:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
29 | for (int i = 0; i < v.size(); i++)
| ~~^~~~~~~~~~
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