foo.cc: In function ‘int main()’:
foo.cc:9:27: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
    9 |         for (int i = 0; i < s.size(); i++)
      |                         ~~^~~~~~~~~~
foo.cc:12:42: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   12 |                 while (s[i] == s[j] && j < s1.size())
      |                                        ~~^~~~~~~~~~~
foo.cc:14:23: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   14 |                 if (j == s1.size())
      |                     ~~^~~~~~~~~~~~
foo.cc:11:28: warning: unused variable ‘f’ [-Wunused-variable]
   11 |                 int j = 0, f = 0;
      |                            ^

正在同步测试数据，请稍后