foo.cc: In function 'int main()':
foo.cc:9:11: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |  for(i=1;i<=s1.size();i++)
      |          ~^~~~~~~~~~~
foo.cc:9:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
    9 |  for(i=1;i<=s1.size();i++)
      |  ^~~
foo.cc:11:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   11 |   for(i=1;i<=s2.size();i++)
      |   ^~~
foo.cc:11:12: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |   for(i=1;i<=s2.size();i++)
      |           ~^~~~~~~~~~~

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