Compilare: user.cpp: In function ‘int main()’: user.cpp:9:9: warning: unused variable ‘a’ [-Wunused-variable] int n,k,a,i,q,x,y,z,s=0,sum=0; ^ user.cpp:10:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:11:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&q,&x,&y,&z); ^