foo.cc: In function 'int main()':
foo.cc:9:16: 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:11:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
11 | if (b>=s.size())
| ~^~~~~~~~~~
foo.cc:25:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
25 | if (i>=s.size())
| ~^~~~~~~~~~
[Hydro](https://hydro.ac)提供评测服务