引言
对于即将步入实习期的学生们来说，B2实习期考试是一个重要的关卡。它不仅是对你专业知识的一次检验，更是对你实习期表现的初步评估。为了帮助大家顺利通过B2实习期考试，本文将提供一系列独家练习题，助你轻松应对考试挑战。
第一部分：基础知识巩固
1.1 数据结构与算法
练习题1： 请实现一个快速排序算法，并给出相应的代码。
def quick_sort(arr):
if len(arr) <= 1:
return arr
pivot = arr[len(arr) // 2]
left = [x for x in arr if x < pivot]
middle = [x for x in arr if x == pivot]
right = [x for x in arr if x > pivot]
return quick_sort(left) + middle + quick_sort(right)
# 测试代码
print(quick_sort([3, 6, 8, 10, 1, 2, 1]))
练习题2： 请实现一个链表反转的功能，并给出相应的代码。
class ListNode:
def __init__(self, val=0, next=None):
self.val = val
self.next = next
def reverse_list(head):
prev = None
current = head
while current:
next_node = current.next
current.next = prev
prev = current
current = next_node
return prev
# 测试代码
head = ListNode(1, ListNode(2, ListNode(3, ListNode(4))))
new_head = reverse_list(head)
while new_head:
print(new_head.val, end=' ')
new_head = new_head.next
1.2 编程基础
练习题3： 请实现一个函数，计算两个整数的最大公约数。
def gcd(a, b):
while b:
a, b = b, a % b
return a
# 测试代码
print(gcd(48, 18))
1.3 设计模式
练习题4： 请实现一个工厂模式，用于创建不同类型的对象。
class Dog:
def speak(self):
return "Woof!"
class Cat:
def speak(self):
return "Meow!"
class AnimalFactory:
@staticmethod
def create_animal(animal_type):
if animal_type == "dog":
return Dog()
elif animal_type == "cat":
return Cat()
else:
raise ValueError("Unknown animal type")
# 测试代码
dog = AnimalFactory.create_animal("dog")
print(dog.speak())
cat = AnimalFactory.create_animal("cat")
print(cat.speak())
第二部分：实践应用
2.1 项目实战
练习题5： 请设计一个简单的用户登录系统，包括用户注册、登录、修改密码等功能。
class User:
def __init__(self, username, password):
self.username = username
self.password = password
class UserService:
def __init__(self):
self.users = {}
def register(self, username, password):
if username in self.users:
return "Username already exists"
self.users[username] = User(username, password)
return "User registered successfully"
def login(self, username, password):
if username not in self.users:
return "Username does not exist"
user = self.users[username]
if user.password == password:
return "Login successful"
else:
return "Incorrect password"
def change_password(self, username, old_password, new_password):
if username not in self.users:
return "Username does not exist"
user = self.users[username]
if user.password == old_password:
user.password = new_password
return "Password changed successfully"
else:
return "Incorrect old password"
# 测试代码
service = UserService()
print(service.register("user1", "password1"))
print(service.login("user1", "password1"))
print(service.change_password("user1", "password1", "new_password1"))
2.2 数据结构与算法应用
练习题6： 请实现一个简单的哈希表，用于存储和检索键值对。
class HashTable:
def __init__(self, size=100):
self.size = size
self.table = [None] * self.size
def _hash(self, key):
return hash(key) % self.size
def set(self, key, value):
index = self._hash(key)
if self.table[index] is None:
self.table[index] = [(key, value)]
else:
for k, v in self.table[index]:
if k == key:
self.table[index] = [(key, value)]
return
self.table[index].append((key, value))
def get(self, key):
index = self._hash(key)
if self.table[index] is None:
return None
for k, v in self.table[index]:
if k == key:
return v
return None
# 测试代码
table = HashTable()
table.set("name", "Alice")
print(table.get("name"))
结论
通过以上独家练习题的练习，相信你已经具备了应对B2实习期考试的能力。祝你考试顺利，实习成功！