Compilare: user.cpp: In function ‘void Read()’: user.cpp:81:13: warning: unused variable ‘j’ [-Wunused-variable] int j = 0; ^ user.cpp:76:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &N, &M, &B); ^ user.cpp: In member function ‘void InputReader::Buff()’: user.cpp:25:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, 100000, stdin); ^