Cube  Diff

	} else                                                                 \
		for (int i = 0; i < (v).length(); i++)
#define loopvrev(v)                                                            \
	if (false) {                                                           \
	} else                                                                 \
		for (int i = (v).length() - 1; i >= 0; i--)

template <class T> struct hashtable {
	struct chain {
		chain *next;
		const char *key;
		T data;
	};

	int size;
	int numelems;
	chain **table;
	pool *parent;
	chain *enumc;

	hashtable()
	{
		this->size = 1 << 10;
		this->parent = gp();
		numelems = 0;
		table = (chain **)parent->alloc(size * sizeof(T));
		for (int i = 0; i < size; i++)
			table[i] = NULL;
	};

	hashtable(hashtable<T> &v);
	void operator=(hashtable<T> &v);

	T *
	access(const char *key, T *data = NULL)
	{
		unsigned int h = 5381;
		for (int i = 0, k; k = key[i]; i++)
			h = ((h << 5) + h) ^ k; // bernstein k=33 xor
		h = h & (size - 1); // primes not much of an advantage
		for (chain *c = table[h]; c; c = c->next) {
			char ch;
			for (const char *p1 = key, *p2 = c->key;
			     (ch = *p1++) == *p2++;)
				if (!ch) // if(strcmp(key,c->key)==0)
				{
					T *d = &c->data;
					if (data)
						c->data = *data;
					return d;
				}
		}
		if (data) {
			chain *c = (chain *)parent->alloc(sizeof(chain));
			c->data = *data;
			c->key = key;
			c->next = table[h];
			table[h] = c;
			numelems++;
		}
		return NULL;
	}
};

#define enumerate(ht, t, e, b)                                                 \
	loopi(ht->size) for (ht->enumc = ht->table[i]; ht->enumc;              \
	                     ht->enumc = ht->enumc->next)                      \
	{                                                                      \
		t e = &ht->enumc->data;                                        \
		b;                                                             \
	}

inline char *
newstring(const char *s)
{
	return gp()->string(s);
}

inline char *