foo.cc: In function 'int main()':
foo.cc:7:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 |         for(int i=0;i<s.size() ;i++)
      |                     ~^~~~~~~~~
foo.cc:9:22: 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<s1.size() ;i++)
      |                     ~^~~~~~~~~~
foo.cc:11:22: warning: comparison of integer expressions of different signedness: 'int' and 'const long unsigned int' [-Wsign-compare]
   11 |         for(int i=1;i<=max(s.size() ,s1.size() );i++)
      |                     ~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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