Compilare: user.cpp: In function ‘void Bf(int)’: user.cpp:94:24: warning: unused variable ‘costmuc’ [-Wunused-variable] int mi = 0x3f3f3f3, costmuc = 0x3f3f3f3; ^~~~~~~ user.cpp: In function ‘int main()’: user.cpp:30:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rege2.in", "r", stdin); ^ user.cpp:31:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rege2.out", "w", stdout); ^ user.cpp: In function ‘void Next()’: user.cpp:118:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] std::fread(S, 1, Lim, stdin), u = 0; ^