foo.cc: In function 'int main()':
foo.cc:10:14: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   10 |  if(s[n]=='r'&&s[n-1]=='e'||s[n]=='y'&&s[n-1]=='l')
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=0;i<s.size()-2;i++)
      |           ~^~~~~~~~~~~
foo.cc:16:11: 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]
   16 |  for(i=0;i<s.size()-3;i++)
      |          ~^~~~~~~~~~~
foo.cc:19:12: 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]
   19 |   for(i=0;i<s.size();i++)
      |           ~^~~~~~~~~

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