foo.cc: In function ‘int main()’:
foo.cc:10:18: warning: comparison of integer expressions of different signedness: ‘long long int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   10 |         for(a=0;a<=x.size()-1;a=a+1)
      |                 ~^~~~~~~~~~~~
foo.cc:30:18: warning: comparison of integer expressions of different signedness: ‘long long int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   30 |         for(a=0;a<=x.size()-1;a=a+1)
      |                 ~^~~~~~~~~~~~
foo.cc:33:28: warning: comparison of integer expressions of different signedness: ‘long long int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   33 |                 for(b=a+1;b<=x.size()-1;b=b+1)
      |                           ~^~~~~~~~~~~~
foo.cc:8:23: warning: unused variable ‘c’ [-Wunused-variable]
    8 |         long long a,b,c,d,e,f,max;
      |                       ^
foo.cc:8:27: warning: unused variable ‘e’ [-Wunused-variable]
    8 |         long long a,b,c,d,e,f,max;
      |                           ^
foo.cc:8:29: warning: unused variable ‘f’ [-Wunused-variable]
    8 |         long long a,b,c,d,e,f,max;
      |                             ^

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