foo.cc: In function 'int main()':
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<s.size();i++)
      |                     ~^~~~~~~~~
foo.cc:14:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |                         for(int j=1;j<n.size();j++)
      |                                     ~^~~~~~~~~
foo.cc:20:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |                                 if(sum==n.size())
      |                                    ~~~^~~~~~~~~~
foo.cc:5:13: warning: unused variable 'j' [-Wunused-variable]
    5 |         int j,sum=0,cnt=0;
      |             ^

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