数据结构----动态查找(哈希表)

#include 
#include 
#include 

typedef int KeyType;

typedef struct {
	KeyType key;
	//冲突次数
	int hi;
} DataType;

typedef struct {
	DataType *data;
	//hash表的长度
	int tableSize;
	//表中关键字个数
	int curSize;
} HashTable;


/*创建hash表*/
void CreateHashTable(HashTable *h, int m, int p, int hash[], int n) {
	int i, sum, addr, di, k = 1;
	(*h).data = (DataType *)malloc(m * sizeof(DataType));

	if (!(*h).data) {
		exit(-1);
	}
	//初始化hash表
	for (i = 0; i < m; i++) {
		(*h).data[i].key = -1;
		(*h).data[i].hi = 0;
	}

	//求hash地址，并处理冲突
	for (i = 0; i < n; i++) {
		sum = 0;
		addr = hash[i] % p;
		di = addr;
		if ((*h).data[addr].key == -1) {
			//如果不冲突，将元素存储在表中
			(*h).data[addr].key = hash[i];
			(*h).data[addr].hi = 1;
		} else {
			//用线性探测再散列处理冲突
			do {
				di = (di + k) % m;
				sum += 1;
			} while ((*h).data[di].key != -1);
			(*h).data[di].key = hash[i];
			(*h).data[di].hi = sum + 1;
		}
	}
	//hash表中关键字个数
	(*h).curSize = n;
	//hash表长度
	(*h).tableSize = m;
}

/*在hash表中查找关键字K的元素*/
int SearchHash(HashTable h, KeyType k) {
	int d, d1, m;
	m = h.tableSize;
	//求k的hash地址
	d = d1 = k % m;
	while (h.data[d].key != -1) {
		if (h.data[d].key == k) {
			return d;
		} else {
			d = (d + 1) % m;
		}
		if (d == d1) {
			return 0;
		}
	}
	return 0;
}

/*求hash表的平均查找长度*/
void HashASL(HashTable h, int m) {
	float average = 0;
	int i;
	for (i = 0; i < m; i++) {
		average = average + h.data[i].hi;
	}
	average = average / h.curSize;
	printf("\n平均查找长度ASL=%2.f", average);
	printf("\n");
}

/*输出hash表*/
void DisplayHash(HashTable h, int m) {
	int i;
	printf("hash表地址:");
	for (i = 0; i < m; i++) {
		printf("%-5d", i);
	}
	printf("\n关键字key:");
	for (i = 0; i < m; i++) {
		printf("%-5d", h.data[i].key);
	}
	printf("\n冲突次数:");
	for (i = 0; i < m; i++) {
		printf("%-5d", h.data[i].hi);
	}
	printf("\n");
}


int main(void) {
	int hash[] = {78, 90, 66, 70, 155, 82, 123, 231};
	int m = 11, p = 11, n = 8, pos;
	KeyType k;
	HashTable h;
	CreateHashTable(&h, m, p, hash, n);
	DisplayHash(h, m);
	k = 155;
	pos = SearchHash(h, k);
	printf("关键字%d在hash表中的位置为:%d\n", k, pos);
	HashASL(h, m);
	getch();
	printf("\n");
	system("pause");
	return 0;
}