Compilare: user.cpp: In function ‘void prekmp()’: user.cpp:39:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2; i<s.size(); ++i) ^ user.cpp: In function ‘void read()’: user.cpp:61:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<t.size(); ++i) ^ user.cpp:69:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(q == s.size()-1) ^