在压缩稀疏表示中,解决方案如下所示: >>>fromscipy.sparseimportcsr_matrix>>>fromscipy.sparse.csgraphimportminimum_spanning_tree>>>X = csr_matrix([[0,8,0,3],...[0,0,2,5],...[0,0,0,6],...[0,0,0,0]])>>>Tcsr =minimum_spanning_tree(X)>>>Tcsr.toarray().astype(int) array(...
思科Spanning Tree Protocol(STP)生成树 ... Spanning-tree+hsrp+ eigrp综合实验 STP (spanning Tree Protocol,生成树)就是把一个环形的结构改变成一个树形的结构,STP协议就是用来将物理上存在环路的网络,通过一种算法,在逻辑上,阻塞一些端口,来生成一个逻辑结构。 HSRP(host standby routing protocol,热备路由...
Description Determine a(*) minimum spanning tree (MST) of the complete undirected graph representing a set of n points whose weights correspond to the pairwise distances between the points.Usage mst(d, ...) ## Default S3 method: mst( d, distance = c("euclidean", "l2", "manhattan", "...
空间复杂度:O(h),h 是二叉树的高度。 Python3代码 # Definition for a binary tree node.# class TreeNode:# def __init__(self, x):# self.val = x# self.left = None# self.right = NoneclassSolution:defminDepth(self, root: TreeNode) ->int:# solution one: DFS# 根为空ifnotroot:retur...
Python3代码 # Definition for a binary tree node.# class TreeNode:# def __init__(self, x):# self.val = x# self.left = None# self.right = NoneclassSolution:defminDepth(self,root:TreeNode)->int:# solution two: BFSimportcollections# 根为空ifnotroot:return0que=collections.deque([(root...
LeetCode 111 题,Minimum Depth of Binary Tree 解题思路 1、读题,求解二叉树的最小Depth。 2、用bfs 去解决,队列带上每层的层数。当有一个节点的左右子树都为空时,返回当前层数,就找到解。 Python 代码 # De…
1 class Solution(object): 2 def findSecondMinimumValue(self, root): 3 """ 4 :type root: TreeNode 5 :rtype: int 6 """ 7 # Time: O(n) 8 # Space: O(lgn) 9 res = [float('inf')] 10 def traverse(node): 11 if not node: 12 return 13 if root.val < node.val < res[0]...
classSolution:#@param root, a tree node#@return an integerminDep =-1defminDepth(self, root):ifrootisNone:return0 self.helper(root,1)returnself.minDep#@param dep, 当前为第几层defhelper(self,root,dep):ifroot.leftisNoneandroot.rightisNone:ifself.minDepis-1: ...
# def __init__(self, x): # self.val = x # self.left = None # self.right = None class Solution(object): depthList=[] def minDepth(self, root): """ :type root: TreeNode :rtype: int """ self.depthList=[] if root==None:return 0 ...
AC代码(Python) 1#Definition for a binary tree node.2#class TreeNode(object):3#def __init__(self, x):4#self.val = x5#self.left = None6#self.right = None78classSolution(object):9defminDepth(self, root):10"""11:type root: TreeNode12:rtype: int13"""14ifroot ==None:15return01...