Compilare: user.cpp:5:16: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] #define Maxv 1 << 20 + 2 ^ user.cpp:7:18: note: in expansion of macro ‘Maxv’ int n, i, j, viz[Maxv], l, p; ^ user.cpp:5:16: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] #define Maxv 1 << 20 + 2 ^ user.cpp:8:10: note: in expansion of macro ‘Maxv’ bool sol[Maxv]; ^ user.cpp: In function ‘int main()’: user.cpp:35:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biti.in", "r", stdin); ^ user.cpp:36:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biti.out", "w", stdout); ^ user.cpp:37:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^