foo.cc: In function 'int main()':
foo.cc:12:30: 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.size();i++) a1[a[i]-97]++;
      |                             ~^~~~~~~~~
foo.cc:13:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |                 for(int i=0;i<b.size();i++) b1[b[i]-97]++;
      |                             ~^~~~~~~~~
foo.cc:22:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |                 for(int i=0;i<a.size();i++) a1[a[i]-97]++;
      |                             ~^~~~~~~~~
foo.cc:23:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |                 for(int i=0;i<b.size();i++) b1[b[i]-97]++;
      |                             ~^~~~~~~~~
foo.cc:31:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |                         for(i=0,j=0;i<a.size();i++)
      |                                     ~^~~~~~~~~
foo.cc:33:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |                         if(j==b.size()) puts("automation");
      |                            ~^~~~~~~~~~

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