Compilare: main.cpp: In function 'bool Palindrom(std::__cxx11::string)': main.cpp:11:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i <= (aux.length() - 1) / 2; ++i) ~~^~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:77:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < x.length(); ++i) ~~^~~~~~~~~~~~ main.cpp:79:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (x[i] != '0' || i == x.length() - 1) ~~^~~~~~~~~~~~~~~~~ main.cpp:85:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = ptr; i < x.length(); ++i) ~~^~~~~~~~~~~~ main.cpp:75:13: warning: 'ptr' may be used uninitialized in this function [-Wmaybe-uninitialized] int ptr; ^~~