Compilare: main.cpp: In function 'std::string cal_lca(const string&, const string&)': main.cpp:27:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'const long unsigned int' [-Wsign-compare] 27 | for (int i = 0; i < min(a.size() , b.size()); i++) { | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void get_lca()': main.cpp:37:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | for (int i = 0; i < s.size(); i++) { | ~~^~~~~~~~~~ main.cpp:42:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | if (i + 1 < s.size()) { | ~~~~~~^~~~~~~~~~ main.cpp: In function 'bool isSubstring(const string&, const string&)': main.cpp:50:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'const long unsigned int' [-Wsign-compare] 50 | for (int i = 0; i < min(a.size() , b.size()); i++) { | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void takeOut_prefixes(std::vector<std::__cxx11::basic_string<char> >&)': main.cpp:57:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | for (int i = 0; i < s.size(); i++) { | ~~^~~~~~~~~~