Compilare: main.cpp: In function 'int main()': main.cpp:11:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 11 | for(int pos = 0; pos < str.size(); pos++){ | ~~~~^~~~~~~~~~~~ main.cpp:15:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(int pos2 = pos1 + 1; pos2 < str.size(); pos2++){ | ~~~~~^~~~~~~~~~~~