Compilare: main.cpp: In function 'int main()': main.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < s.size(); ++i) { ~~^~~~~~~~~~ main.cpp:23:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i + (manacher[i] - 1) / 2 + 1 < s.size() and i - (manacher[i] - 1) / 2 - 1 >= 1 and s[i + (manacher[i] - 1) / 2 + 1] == s[i - (manacher[i] - 1) / 2 - 1]) { ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~ main.cpp:31:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i + (manacher[i] - 1) / 2 + 1 < s.size() and i - (manacher[i] - 1) / 2 - 1 >= 1 and s[i + (manacher[i] - 1) / 2 + 1] == s[i - (manacher[i] - 1) / 2 - 1]) { ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~ main.cpp:39:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < s.size(); ++i) { ~~^~~~~~~~~~