Compilare: user.cpp: In function ‘int last_kmp(const string&)’: user.cpp:6:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1, k = 0; i < str.size(); ++i){ ^ user.cpp: In function ‘int max_kmp(const string&)’: user.cpp:15:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1, k = 0; i < str.size(); ++i){ ^ user.cpp: In function ‘int superstring_len(const string&, const string&)’: user.cpp:24:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(max_kmp(x) == a.size()) return b.size(); ^ user.cpp:25:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(max_kmp(y) == b.size()) return a.size(); ^