Compilare: user.cpp: In function ‘int main()’: user.cpp:11:14: warning: unused variable ‘lv’ [-Wunused-variable] int i,dr,lv,lc,cv,cc,sem,j,a,b; ^ user.cpp:11:20: warning: unused variable ‘cv’ [-Wunused-variable] int i,dr,lv,lc,cv,cc,sem,j,a,b; ^ user.cpp:11:26: warning: unused variable ‘sem’ [-Wunused-variable] int i,dr,lv,lc,cv,cc,sem,j,a,b; ^ user.cpp:59:12: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] out<<b-a<<'\n'; ^ user.cpp:59:12: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized]