Compilare: user.cpp: In function ‘void ZAlgorithm()’: user.cpp:15:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 1; k < S.length(); k++) { ^ user.cpp:19:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(right < S.length() && S[right] == S[right - left]) ^ user.cpp:29:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(right < S.length() && S[right] == S[right - left]) ^ user.cpp: In function ‘int main()’: user.cpp:46:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = np; i < S.length(); ++i) ^ user.cpp:52:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = np; i < S.length() && cnt != 1000; ++i) ^