Compilare: main.cpp: In function 'int main()': main.cpp:17:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | for (int i = 0; i < strings[0].length(); ++i) { | ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:22:52: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | for (int k = i + 1, l = pos + 1; k < strings[0].length() && l < strings[j].length(); ++k, ++l) { | ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:22:79: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | for (int k = i + 1, l = pos + 1; k < strings[0].length() && l < strings[j].length(); ++k, ++l) { | ~~^~~~~~~~~~~~~~~~~~~~~