Compilare: user.cpp: In function ‘int main()’: user.cpp:16:17: warning: unused variable ‘j’ [-Wunused-variable] int n,k,i=0,j,t=0,a,b; ^ user.cpp:16:23: warning: unused variable ‘a’ [-Wunused-variable] int n,k,i=0,j,t=0,a,b; ^ user.cpp:16:25: warning: unused variable ‘b’ [-Wunused-variable] int n,k,i=0,j,t=0,a,b; ^