Compilare: user.cpp: In function ‘int main()’: user.cpp:22:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<s.size();i++) ^ user.cpp:29:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<text.size();i++) ^ user.cpp:30:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pi[pattern.size()+1+i]==pattern.size()) ^