2024-09-27
2024-09-27
2024-09-27
2024-09-27
2024-09-27
# 2024年地大数据结构模拟题及答案解析
## 大学数据结构考试题
### 1. 单链表的插入操作
- **问题描述**:在单链表中插入一个元素,使得新元素可以成为头结点。
- **代码实现**:
```python
class Node:
def __init__(self, data=None):
self.data = data
self.next = None
class LinkedList:
def __init__(self):
self.head = None
def insert(self, data):
new_node = Node(data)
if not self.head:
self.head = new_node
return
last_node = self.head
while last_node.next:
last_node = last_node.next
last_node.next = new_node
```
### 2. 双链表的查找操作
- **问题描述**:在双链表中查找一个特定的值,并返回该值在链表中的位置。
- **代码实现**:
```python
class Node:
def __init__(self, data=None):
self.data = data
self.prev = None
self.next = None
class DoublyLinkedList:
def __init__(self):
self.head = None
def insert(self, data):
new_node = Node(data)
if not self.head:
self.head = new_node
return
last_node = self.head
while last_node.next:
last_node = last_node.next
last_node.next = new_node
```
### 3. 循环链表的删除操作
- **问题描述**:从循环链表中删除一个特定的值,并返回被删除节点的前一个节点。
- **代码实现**:
```python
class Node:
def __init__(self, data=None):
self.data = data
self.prev = None
class CircularLinkedList:
def __init__(self, data=None):
self.head = None
self.tail = None
self.size = 0
def insert(self, data):
new_node = Node(data)
if not self.head:
self.head = new_node
self.tail = new_node
else:
new_node.next = self.head
self.head.prev = new_node
self.head = new_node
self.size += 1
def delete(self, key):
if not self.head or self.head.data == key:
return None
current = self.head
while current and current.data != key:
next_node = current.next
current.next = next_node.next
next_node.prev = current
current = next_node
if current.next:
current.next.prev = current.prev
else:
self.tail = current.prev
if self.size > 1:
self.head = self.head.next
return current
```
## 大学数据结构期末考试题
### 1. 栈和队列的应用
- **问题描述**:设计一个程序,使用栈和队列实现两个基本操作:入栈(push)和出栈(pop)。
- **代码实现**:
```python
class Stack:
def __init__(self):
self.items = []
def push(self, item):
self.items.append(item)
def pop(self):
if not self.is_empty():
return self.items.pop()
else:
return None
def is_empty(self):
return len(self.items) == 0
```
### 2. 链表的遍历与修改
- **问题描述**:编写一个程序,实现链表的遍历(前序、中序、后序),并对链表进行插入、删除操作。
- **代码实现**:
```python
class ListNode:
def __init__(self, x):
self.val = x
self.next = None
class LinkedList:
def __init__(self):
self.head = None
self.tail = None
self.size = 0
def insert(self, value):
if not self.head:
self.head = ListNode(value)
self.tail = self.head
else:
temp = self.head
while temp.next:
temp = temp.next
temp.next = ListNode(value)
self.tail = temp
self.size += 1
def delete(self, value):
if not self.head:
return None
if self.head.val == value:
self.head = self.head.next
self.size -= 1
return self.head
temp = self.head
while temp.next and temp.next.val != value:
temp = temp.next
if temp.next:
temp.next = temp.next.next
else:
self.tail = temp.prev
return self.head
return self.head
```
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大学数据结构考试题
大学数据结构期末考试题
数据结构模拟试题答案