Format python codes with black. (#453)

This commit is contained in:
Yudong Jin
2023-04-09 05:05:35 +08:00
committed by GitHub
parent 1c8b7ef559
commit 5ddcb60825
45 changed files with 656 additions and 456 deletions

View File

@ -4,35 +4,37 @@ Created Time: 2023-03-01
Author: Krahets (krahets@163.com)
"""
class ArrayDeque:
""" 基于环形数组实现的双向队列 """
"""基于环形数组实现的双向队列"""
def __init__(self, capacity: int) -> None:
""" 构造方法 """
"""构造方法"""
self.__nums: list[int] = [0] * capacity
self.__front: int = 0
self.__size: int = 0
def capacity(self) -> int:
""" 获取双向队列的容量 """
"""获取双向队列的容量"""
return len(self.__nums)
def size(self) -> int:
""" 获取双向队列的长度 """
"""获取双向队列的长度"""
return self.__size
def is_empty(self) -> bool:
""" 判断双向队列是否为空 """
"""判断双向队列是否为空"""
return self.__size == 0
def index(self, i: int) -> int:
""" 计算环形数组索引 """
"""计算环形数组索引"""
# 通过取余操作实现数组首尾相连
# 当 i 越过数组尾部后,回到头部
# 当 i 越过数组头部后,回到尾部
return (i + self.capacity()) % self.capacity()
def push_first(self, num: int) -> None:
""" 队首入队 """
"""队首入队"""
if self.__size == self.capacity():
print("双向队列已满")
return
@ -44,7 +46,7 @@ class ArrayDeque:
self.__size += 1
def push_last(self, num: int) -> None:
""" 队尾入队 """
"""队尾入队"""
if self.__size == self.capacity():
print("双向队列已满")
return
@ -55,7 +57,7 @@ class ArrayDeque:
self.__size += 1
def pop_first(self) -> int:
""" 队首出队 """
"""队首出队"""
num = self.peek_first()
# 队首指针向后移动一位
self.__front = self.index(self.__front + 1)
@ -63,25 +65,25 @@ class ArrayDeque:
return num
def pop_last(self) -> int:
""" 队尾出队 """
"""队尾出队"""
num = self.peek_last()
self.__size -= 1
return num
def peek_first(self) -> int:
""" 访问队首元素 """
"""访问队首元素"""
assert not self.is_empty(), "双向队列为空"
return self.__nums[self.__front]
def peek_last(self) -> int:
""" 访问队尾元素 """
"""访问队尾元素"""
assert not self.is_empty(), "双向队列为空"
# 计算尾元素索引
last = self.index(self.__front + self.__size - 1)
return self.__nums[last]
def to_array(self) -> list[int]:
""" 返回数组用于打印 """
"""返回数组用于打印"""
# 仅转换有效长度范围内的列表元素
res = []
for i in range(self.__size):
@ -91,35 +93,35 @@ class ArrayDeque:
""" Driver Code """
if __name__ == "__main__":
""" 初始化双向队列 """
# 初始化双向队列
deque = ArrayDeque(10)
deque.push_last(3)
deque.push_last(2)
deque.push_last(5)
print("双向队列 deque =", deque.to_array())
""" 访问元素 """
# 访问元素
peek_first: int = deque.peek_first()
print("队首元素 peek_first =", peek_first)
peek_last: int = deque.peek_last()
print("队尾元素 peek_last =", peek_last)
""" 元素入队 """
# 元素入队
deque.push_last(4)
print("元素 4 队尾入队后 deque =", deque.to_array())
deque.push_first(1)
print("元素 1 队首入队后 deque =", deque.to_array())
""" 元素出队 """
# 元素出队
pop_last: int = deque.pop_last()
print("队尾出队元素 =", pop_last, ",队尾出队后 deque =", deque.to_array())
pop_first: int = deque.pop_first()
print("队首出队元素 =", pop_first, ",队首出队后 deque =", deque.to_array())
""" 获取双向队列的长度 """
# 获取双向队列的长度
size: int = deque.size()
print("双向队列长度 size =", size)
""" 判断双向队列是否为空 """
# 判断双向队列是否为空
is_empty: bool = deque.is_empty()
print("双向队列是否为空 =", is_empty)