Compilare: user.cpp: In function ‘int main()’: user.cpp:9:11: warning: unused variable ‘a’ [-Wunused-variable] int n,a,b; ^ user.cpp:9:13: warning: unused variable ‘b’ [-Wunused-variable] int n,a,b; ^ user.cpp:31:20: warning: ‘b1’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(i+1!=a1 && i+1!=b1) ^ user.cpp:31:9: warning: ‘a1’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(i+1!=a1 && i+1!=b1) ^