Compilare: user.cpp: In function ‘long long int f(long long int, long long int)’: user.cpp:22:5: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (i==Max+1) if (n==0) return 1;else return 0; ^ user.cpp: In function ‘int main()’: user.cpp:37:5: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (i<=j) ^ user.cpp:31:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pviz.in","r",stdin); ^ user.cpp:32:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pviz.out","w",stdout); ^ user.cpp:47:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld",&x); ^