Compilare: user.cpp: In function ‘void Manacher(std::string)’: user.cpp:96:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i <= 2 * s.size(); i++) ^ user.cpp:102:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < ss.size(); i++) { ^ user.cpp:105:70: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i - length[i] - 1 >= 0 && i + length[i] + 1 < ss.size() && ss[i - length[i] - 1] == ss[i + length[i] + 1]) ^ user.cpp: In function ‘long long int EraseOverlaps(std::string)’: user.cpp:117:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < 2 * s.size(); i++) ^