Compilare: user.cpp: In function ‘int main()’: user.cpp:8:9: warning: unused variable ‘n’ [-Wunused-variable] int n,k,a; ^ user.cpp:8:11: warning: unused variable ‘k’ [-Wunused-variable] int n,k,a; ^ user.cpp:8:13: warning: unused variable ‘a’ [-Wunused-variable] int n,k,a; ^ user.cpp:31:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ user.cpp:34:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^