Compilare: main.cpp: In function 'int main()': main.cpp:17:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1;i < s.length();++i) ~~^~~~~~~~~~~~ main.cpp:22:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (right < s.length() && s[right] == s[right - left]) ~~~~~~^~~~~~~~~~~~ main.cpp:34:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (right < s.length() && s[right] == s[right - left]) ~~~~~~^~~~~~~~~~~~ main.cpp:43:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = sz;i < s.length();++i) ~~^~~~~~~~~~~~