#define elem(x) ((int)(sizeof(x)/sizeof((x)[0])))
#define nil		((void*)0)

typedef	unsigned short	ushort;
typedef	unsigned char	uchar;
typedef unsigned long	ulong;
typedef unsigned int	uint;
typedef signed char	schar;
typedef	long long	vlong;
typedef	unsigned long long uvlong;
typedef long		iptr;
typedef unsigned long	uptr;
typedef unsigned long	usize;
typedef unsigned char	u8;
typedef unsigned short	u16;
typedef unsigned int	u32;
typedef unsigned long long u64;
typedef signed char i8;
typedef signed short i16;
typedef signed int i32;
typedef signed long long i64;