foo.cc: In function 'void Test()':
foo.cc:12:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
12 | for (int i = 0; i < a.length(); i++)
| ~~^~~~~~~~~~~~
foo.cc:17:18: 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 (j = 0; j < a1.length(); j++)
| ~~^~~~~~~~~~~~~
foo.cc:25:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
25 | if (j == a1.length())
| ~~^~~~~~~~~~~~~~
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