Compilare: user.cpp: In function ‘int main()’: user.cpp:29:15: warning: unused variable ‘n_factorial’ [-Wunused-variable] int n, k, n_factorial=1, k_factorial=1, nrperm; ^ user.cpp:29:30: warning: unused variable ‘k_factorial’ [-Wunused-variable] int n, k, n_factorial=1, k_factorial=1, nrperm; ^ user.cpp:29:45: warning: unused variable ‘nrperm’ [-Wunused-variable] int n, k, n_factorial=1, k_factorial=1, nrperm; ^