Compilare: user.cpp: In function ‘void prefix()’: user.cpp:32:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int q=2; q<P.length(); q++) ^ user.cpp: In function ‘void match()’: user.cpp:51:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<T.length();i++) ^ user.cpp: In function ‘void print()’: user.cpp:75:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<result.size();i++) ^