Compilare: user.cpp: In function ‘void read()’: user.cpp:28:48: warning: format ‘%lld’ expects argument of type ‘long long int*’, but argument 5 has type ‘int*’ [-Wformat=] scanf("%lld %lld %lld %lld", &a, &b, &c, &k); ^ user.cpp:26:9: warning: unused variable ‘rd’ [-Wunused-variable] int rd; ^ user.cpp:27:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ecuatie.in", "r", stdin); ^ user.cpp:28:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %lld %lld %lld", &a, &b, &c, &k); ^ user.cpp: In function ‘void write(int)’: user.cpp:32:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ecuatie.out", "w", stdout); ^