Compilare: user.cpp: In function ‘int main()’: user.cpp:22:16: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (i * i + j * j <= y && i * i + j * j >= x) if (ap[i * i + j * j] == 1) printf("%d\n", i * i + j * j); else ap[i * i + j * j]++; ^ user.cpp:15:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("patrat.in","r",stdin); ^ user.cpp:16:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("patrat.out","w",stdout); ^ user.cpp:18:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &x, &y); ^