Compilare: user.cpp: In function ‘void citire()’: user.cpp:14:14: warning: unused variable ‘q’ [-Wunused-variable] art *p,*q; ^ user.cpp: In function ‘int main()’: user.cpp:39:17: warning: unused variable ‘t’ [-Wunused-variable] int k=1,t=0; ^ user.cpp:29:13: warning: unused variable ‘j’ [-Wunused-variable] int w,i,j; ^ user.cpp: In function ‘void citire()’: user.cpp:20:18: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] p->cost=c; ^