Compilare: main.cpp: In function 'int main()': main.cpp:3:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses] #define Mask (1 << 8) - 1 ~~~~~~~~~^~~ main.cpp:28:45: note: in expansion of macro 'Mask' ++ frq[(v[t][i] >> (B * dig)) & Mask]; ^~~~ main.cpp:3:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses] #define Mask (1 << 8) - 1 ~~~~~~~~~^~~ main.cpp:32:48: note: in expansion of macro 'Mask' int val = (v[t][i] >> (B * dig)) & Mask; ^~~~ main.cpp:19:38: 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); ^