Compilare: user.cpp: In function ‘int In_hash(long long int, point)’: user.cpp:66:23: warning: unused variable ‘a’ [-Wunused-variable] ll x = val % mod, a, b; ^ user.cpp:66:26: warning: unused variable ‘b’ [-Wunused-variable] ll x = val % mod, a, b; ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:28:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:55:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^ user.cpp: In function ‘void write()’: user.cpp:109:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ograzi.out", "w", stdout); ^