combo.cpp: In function 'void f()':
combo.cpp:8:17: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
8 | if (ans.size() == n)return;
| ~~~~~~~~~~~^~~~
combo.cpp:36:22: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
36 | else if (ans.size() == n - 1)
| ~~~~~~~~~~~^~~~~~~~
combo.cpp:145:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
145 | if (v == ans.size() + 2)
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:149:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
149 | else if (v == ans.size() + 1)
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:168:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
168 | if (v == ans.size() + 2)
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:172:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
172 | else if (v == ans.size() + 1)
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:191:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
191 | if (v == ans.size() + 2)
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:195:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
195 | else if (v == ans.size() + 1)
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:214:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
214 | if (v == ans.size() + 2)
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:218:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
218 | else if (v == ans.size() + 1)
| ~~^~~~~~~~~~~~~~~~~