Compilare: main.cpp: In function 'int main()': main.cpp:14:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | for (int left = 0; left < x.size(); left++){ | ~~~~~^~~~~~~~~~ main.cpp:21:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | while (right < x.size() && unice <= k){ | ~~~~~~^~~~~~~~~~ main.cpp:38:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for (int ltr = 0; ltr < curr_string.size() - 1; ltr++) | ~~~~^~~~~~~~~~~~~~~~~~~~~~~~