Compilare: user.cpp: In function ‘void countsort(int*, int)’: user.cpp:17:28: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] ++ct[(a[i] & (mask << p)) >> p]; ^ user.cpp:23:30: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] aux[ct[(a[i] & (mask << p)) >> p]--] = a[i]; ^ user.cpp: In function ‘void citire()’: user.cpp:36:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &n, &a, &b, &c); ^