Compilare: user.cpp: In function ‘int main()’: user.cpp:15:26: warning: suggest parentheses around comparison in operand of ‘|’ [-Wparentheses] if ((x != 0 || y != 0 | z != 0) && (n - (6 * x * x + y * y + 6 * x * y + 2 * z * z + 8 * x * z + 4 * y * z)) % (4 * x + 2 * y + 2 * z) == 0) ^ user.cpp:6:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("equicover.in", "r", stdin); ^ user.cpp:7:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("equicover.out", "w", stdout); ^ user.cpp:10:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^