Compilare: user.cpp: In function ‘char peek(nod*&)’: user.cpp:37:10: warning: variable ‘p’ set but not used [-Wunused-but-set-variable] nod *p; ^ user.cpp: In function ‘void verificare(char*, nod*&, nod*&)’: user.cpp:62:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(s)-1;i++) ^ user.cpp: In function ‘int main()’: user.cpp:93:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<strlen(s);++j) ^