Compilare: user.cpp: In function ‘int main()’: user.cpp:10:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:13:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=0;i<n;i++) scanf("%d",&v[i]); ^ user.cpp:9:14: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] int i,n,a,b,c,k; ^