Compilare: main.cpp: In function 'int main()': main.cpp:23:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < s.size(); ++i) { ~~^~~~~~~~~~ main.cpp:29:65: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i - manacher[i] - 1 >= 1 and i + manacher[i] + 1 < s.size() and s[i - manacher[i] - 1] == s[i + manacher[i] + 1]) { ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~