利用c语言1、掌握线性探测法的查找函数 2、掌握分离链接法的删除操作函数设计成效分析
时间: 2024-05-02 10:23:42 浏览: 90
好的,让我来回答你的问题。首先,线性探测法是一种哈希表解决冲突的方法,其中查找函数的实现需要遍历哈希表的桶,直到找到要查找的键或者空桶为止。具体实现方式可以参考以下C语言代码:
```c
typedef struct HashNode {
int key;
int value;
} HashNode;
typedef struct HashTable {
HashNode *nodes;
int capacity;
int size;
} HashTable;
// 计算哈希值
int hash(int key, int capacity) {
return key % capacity;
}
// 插入键值对
void insert(HashTable *table, int key, int value) {
int index = hash(key, table->capacity);
int count = 0;
while (table->nodes[index].key != -1 && table->nodes[index].key != key) {
index = (index + 1) % table->capacity;
count++;
if (count == table->capacity) {
fprintf(stderr, "HashTable is full!\n");
return;
}
}
table->nodes[index].key = key;
table->nodes[index].value = value;
table->size++;
}
// 查找值
int search(HashTable *table, int key) {
int index = hash(key, table->capacity);
int count = 0;
while (table->nodes[index].key != -1 && table->nodes[index].key != key) {
index = (index + 1) % table->capacity;
count++;
if (count == table->capacity) {
fprintf(stderr, "Key not found!\n");
return -1;
}
}
return table->nodes[index].value;
}
```
其次,分离链接法也是一种哈希表解决冲突的方法,它将相同哈希值的元素存储在同一个链表中。删除操作需要遍历对应的链表,找到要删除的键值对并删除。具体实现方式可以参考以下C语言代码:
```c
typedef struct HashNode {
int key;
int value;
struct HashNode *next;
} HashNode;
typedef struct HashTable {
HashNode **nodes;
int capacity;
int size;
} HashTable;
// 计算哈希值
int hash(int key, int capacity) {
return key % capacity;
}
// 插入键值对
void insert(HashTable *table, int key, int value) {
int index = hash(key, table->capacity);
HashNode *node = (HashNode *) malloc(sizeof(HashNode));
node->key = key;
node->value = value;
node->next = table->nodes[index];
table->nodes[index] = node;
table->size++;
}
// 查找值
int search(HashTable *table, int key) {
int index = hash(key, table->capacity);
HashNode *node = table->nodes[index];
while (node) {
if (node->key == key) {
return node->value;
}
node = node->next;
}
fprintf(stderr, "Key not found!\n");
return -1;
}
// 删除键值对
void delete(HashTable *table, int key) {
int index = hash(key, table->capacity);
HashNode *node = table->nodes[index];
HashNode *prev = NULL;
while (node) {
if (node->key == key) {
if (prev) {
prev->next = node->next;
} else {
table->nodes[index] = node->next;
}
free(node);
table->size--;
return;
}
prev = node;
node = node->next;
}
fprintf(stderr, "Key not found!\n");
}
```
关于效率方面的分析,线性探测法在哈希表装载因子较小的情况下具有较好的性能,但当装载因子过大时会造成探测冲突的概率增大,而分离链接法在任何情况下都具有较好的性能,并且可以支持较大的装载因子。具体哪种方法更适合取决于哈希表的具体使用情景。
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