password.cpp: In function 'int solve(int, char)':
password.cpp:11:28: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
11 | if (c > 'z' || cur.size() == N)
| ~~~~~~~~~~~^~~~
password.cpp:17:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
17 | if (i != cur.size())
| ~~^~~~~~~~~~~~~
password.cpp:19:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
19 | if (query(tr) == tr.size())
| ~~~~~~~~~~^~~~~~~~~~~~