Compilare: main.cpp: In function 'bool check(int)': main.cpp:27:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | while (i < aux.size()) { | ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:57:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | while (i < s.size()) { | ~~^~~~~~~~~~ main.cpp:77:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 77 | if (x <= s.size() / 3) | ~~^~~~~~~~~~~~~~~ main.cpp:93:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 93 | if (st < 0 || st >= s.size() || dr < 0 || dr >= s.size()) | ~~~^~~~~~~~~~~ main.cpp:93:50: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 93 | if (st < 0 || st >= s.size() || dr < 0 || dr >= s.size()) | ~~~^~~~~~~~~~~ main.cpp:98:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 98 | for (int i = 0; i < prefix.size(); i++) { | ~~^~~~~~~~~~~~~~~ main.cpp:106:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 106 | while (dr < s.size() - prefix[i]) { main.cpp:108:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 108 | if (dr >= s.size()) | ~~~^~~~~~~~~~~