空间复杂度:O(n^2) Python3代码 classSolution:defnumSquares(self, n:int) ->int:# solution one: BFSq = [(n,0)] visited = [Falseforiinrange(n +1)]# initialize all Falsevisited[n] =Truewhileany(q):# any: if all elements are False, return False, or return Truenum, step = q.p...
Stone Game - Leetcode 877 - Python 22:00 Stickers to Spell Word - DP Memoization - Leetcode 691 - Python 27:13 Split Array Largest Sum - Leetcode 410 - Python 16:51 Regular Expression Matching - Dynamic Programming Top-Down Memoization - Leetcod 27:56 Perfect Squares - Dynamic Pro...
Given a positive integern, find the least number of perfect square numbers (for example,1, 4, 9, 16, ...) which sum ton. Example 1: 1212=4+4+4. Example 2: 1313=4+9. classSolution(object):defnumSquares(self, n):""":type n: int :rtype: int"""dp= [n] *(n+1) dp[0]...
In Python, assigning the list from variableato variablebcauses both variables to reference the same list value and thus share it. Consequently, any change applied through one variable will impact the other. This behavior can lead to elusive bugs if a programmer incorrectly assumes that listaandba...
() else: # Python 3 compatible self.opener = urllib.request.build_opener() self.result = [] self.re_links = re.compile('<a.*?href=.*?<\/a>', re.I) # self.re_element = re.compile('', re.I) # Hardcode at following self.requests = [] for url in urls: if hasattr(urllib...
LeetCode 279 Perfect Squares 题目 思路 从大的数指向小的数,无全图上的最短路径问题可以使用层序遍历的推广,广度优先遍历实现。(有权图使用迪杰斯特拉算法) 代码 优化... 279. Perfect Squares Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16,...
Spinning Squares 167.72 212.76 frames/sec User Interface Test 296.17 Elements 296.17 1.36 Krefresh/sec 完整的测试结果在:http://db.xbench.com/merge.xhtml?doc1=327066&doc2=327063 注意:因为单独的图形结果和完整测试不是同一个时间完成,所以数据有所偏差 ...
Python3代码 classSolution:defnumSquares(self,n:int)->int:# solution one: BFSq=[(n,0)]visited=[Falseforiinrange(n+1)]# initialize all Falsevisited[n]=Truewhileany(q):# any: if all elements are False, return False, or return Truenum,step=q.pop(0)i=1Num=num-i**2whileNum>=0:...
Python3 classSolution:def__init__(self):self.squares=[0]*100foriinrange(1,101):self.squares[i-1]=i*idefnumSquares(self,n:int)->int:dp=list(range(n+1))forsquareinself.squares:fortotalinrange(square,n+1):dp[total]=min(dp[total],dp[total-square]+1)returndp[n] ...