foo.cc: In function ‘void get_Next(std::string, int*)’:
foo.cc:11:27: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   11 |         for (int i = 1; i < s.size(); i++)
      |                         ~~^~~~~~~~~~
foo.cc: In function ‘int strSTR(size_t, std::string, std::string)’:
foo.cc:32:29: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   32 |         for (int i = pos; i < s.size(); i++)
      |                           ~~^~~~~~~~~~
foo.cc:44:23: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   44 |                 if (j == t.size())
      |                     ~~^~~~~~~~~~~
foo.cc: In function ‘void Repalce(std::string&, const std::string&, const std::string&, size_t, size_t, size_t)’:
foo.cc:67:35: warning: comparison of integer expressions of different signedness: ‘int’ and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
   67 |                 for (int i = 0; i < lenr; i++)
      |                                 ~~^~~~~~
foo.cc:88:35: warning: comparison of integer expressions of different signedness: ‘int’ and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
   88 |                 for (int i = 0; i < lenr; i++)
      |                                 ~~^~~~~~
foo.cc:96:35: warning: comparison of integer expressions of different signedness: ‘int’ and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
   96 |                 for (int i = 0; i < lenr; i++)
      |                                 ~~^~~~~~
foo.cc: In function ‘int main()’:
foo.cc:116:20: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
  116 |         while (pos < s.size())
      |                ~~~~^~~~~~~~~~
foo.cc: In function ‘int strSTR(size_t, std::string, std::string)’:
foo.cc:48:1: warning: control reaches end of non-void function [-Wreturn-type]
   48 | }
      | ^