Compilare: user.cpp: In function ‘void ZF(std::string)’: user.cpp:16:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < s.size(); k++) { ^ user.cpp:21:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(right < s.size() && s[right] == s[right-left]) ^ user.cpp:33:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(right < s.size() && s[right] == s[right-left]) ^ user.cpp: In function ‘int main()’: user.cpp:55:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < rez.size(); i++) { ^ user.cpp:56:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(Z[i] == s1.size()) ^ user.cpp:62:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < rez.size(); i++) { ^ user.cpp:64:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(Z[i] == s1.size()) { ^