foo.cc: In function 'int main()':
foo.cc:6:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    6 |         for(int i=0;i<s.size();i++)
      |                     ~^~~~~~~~~
foo.cc:8:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |         for(int i=0;i<s.size();i++)
      |                     ~^~~~~~~~~
foo.cc:5:37: warning: unused variable 'cnt' [-Wunused-variable]
    5 |         string s;getline(cin,s);int cnt=0;
      |                                     ^~~

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