Compilare: user.cpp: In function ‘int main()’: user.cpp:15:10: warning: unused variable ‘j’ [-Wunused-variable] {int n,t,j,pr=0,at=0,c,x; ^ user.cpp:15:22: warning: unused variable ‘c’ [-Wunused-variable] {int n,t,j,pr=0,at=0,c,x; ^ user.cpp:19:5: warning: variable ‘d’ set but not used [-Wunused-but-set-variable] int d; ^ user.cpp:31:12: warning: ‘v’ may be used uninitialized in this function [-Wmaybe-uninitialized] *(v+at)=x; ^