如何使用Python实现链表的链表元素相除(Divide Two Integers)操作
首先,我们需要实现链表数据结构。
定义一个节点类Node:
class Node:
def init(self, val=0, next=None):
self.val = val
self.next = next
链表类LinkedList包含以下方法:
- init:初始化链表,建立head节点
- append:在链表尾部添加节点
- printList:打印链表
- length:获取链表长度
class LinkedList:
def init(self):
self.head = Node()
def append(self, val): # 找到链表尾部 curr = self.head while curr.next: curr = curr.next # 插入新节点 curr.next = Node(val) def printList(self): curr = self.head.next while curr: print(curr.val, end=" ") curr = curr.next print() def length(self): count = 0 curr = self.head.next while curr: count += 1 curr = curr.next return count
接下来,实现链表元素相除操作。
链表元素相除操作可以转化为两个整数相除操作。我们可以将链表转换成整数,再进行相除操作。
转换成整数可以采用以下方法:从链表头到尾扫描一遍链表,每个节点的值乘以10的相应次方,然后累加到总和上即可。
例如,链表1->2->3表示的整数为123。
class Solution:
def divide(self, dividend: int, divisor: int) -> int:
# 处理符号
sign = 1
if dividend < 0:
sign = -1
dividend = -1
if divisor < 0:
sign = -1
divisor = -1
# 转换为链表 dividendList = LinkedList() for i in str(dividend): dividendList.append(int(i)) divisorList = LinkedList() for i in str(divisor): divisorList.append(int(i)) # 将链表转换为整数 dividendInt = 0 curr = dividendList.head.next while curr: dividendInt = dividendInt * 10 + curr.val curr = curr.next divisorInt = 0 curr = divisorList.head.next while curr: divisorInt = divisorInt * 10 + curr.val curr = curr.next # 相除操作 quotient = dividendInt // divisorInt # 处理符号 quotient *= sign return quotient
最后,测试一下我们的代码:
s = Solution()
print(s.divide(10, 3)) # 输出3
print(s.divide(7, -3)) # 输出-2
print(s.divide(1, 999)) # 输出0
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