Compilare: user.cpp: In function ‘void print_sol()’: user.cpp:279:25: warning: unused variable ‘p’ [-Wunused-variable] int i, j, x, k = 0, p = 0; ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:21:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^ user.cpp: In function ‘void write()’: user.cpp:312:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("danger.out", "w", stdout); ^