Compilare: main.cpp: In function 'void query1(const int&)': main.cpp:18:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 18 | if (str[i].size() > len) { | ~~~~~~~~~~~~~~^~~~~ main.cpp:21:30: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 21 | } else if (str[i].size() == len && ans < str[i]) | ~~~~~~~~~~~~~~^~~~~~ main.cpp: In function 'bool verif(int, std::string, std::string)': main.cpp:57:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | for (i = 0; i < a.size(); i++) { | ~~^~~~~~~~~~ main.cpp:59:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 59 | while (j < b.size() && b[j] != a[i]) | ~~^~~~~~~~~~ main.cpp:61:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 61 | if (j == b.size()) | ~~^~~~~~~~~~~ main.cpp: In function 'void query1(const int&)': main.cpp:18:25: warning: 'len' may be used uninitialized in this function [-Wmaybe-uninitialized] 18 | if (str[i].size() > len) { | ^~~