Compilare: user.cpp: In function ‘void addN(std::string)’: user.cpp:19:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<x.length(); i++) ^ user.cpp: In function ‘void remV(std::string)’: user.cpp:41:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<x.length(); i++) ^ user.cpp:38:13: warning: unused variable ‘urm’ [-Wunused-variable] NOD *p,*urm; ^ user.cpp: In function ‘void caut(std::string)’: user.cpp:55:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<x.length()-1; i++) ^ user.cpp:50:13: warning: unused variable ‘urm’ [-Wunused-variable] NOD *p,*urm; ^ user.cpp: In function ‘void mi(std::string)’: user.cpp:73:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<x.length(); i++) ^ user.cpp:70:13: warning: unused variable ‘urm’ [-Wunused-variable] NOD *p,*urm; ^