Compilare: user.cpp: In function ‘int main()’: user.cpp:31:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < str.size(); ++i) ^ user.cpp:32:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] cout << z[i] << " \n"[i == str.size()]; ^ user.cpp:34:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < str.size(); ++i) ^ user.cpp:35:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (z[i] == pat.size()) { ^