代码如下: 1classSolution(object):2defisPerfectSquare(self, num):3"""4:type num: int5:rtype: bool6"""7left, right =0, num8whileleft <=right:9mid = (left+right) / 210ifmid ** 2 ==num:11returnTrue12elifmid ** 2 <num:13left = mid + 114else:15right = mid -116returnFalse...
Python3代码 classSolution:defnumSquares(self, n:int) ->int:# solution two: Lagrange's Four-square Theoremwhilen %4==0:# reduce nn /=4ifn %8==7:return4a =0whilea **2<= n: b =int((n - a **2) **0.5)ifa **2+ b **2== n:return(notnota) + (notnotb)# whether a an...
classSolution:defisPerfectSquare(self,num):""":type num: int:rtype: bool"""# 法一# return (int(num**0.5)**2)==num# # 法二:牛顿迭代法# r = num# while r * r > num: # 这步目前不能解释清楚。。# r = (r + num / r) // 2# return r * r == num# 法三:二分法left=0...
[LeetCode][Python]367. Valid Perfect Square Given a positive integer num, write a function which returns True if num is a perfect square else False. Note: Do not use any built-in library function such as sqrt. Example 1: Example 2: 思路:所谓perfect......
[leetcode] 367. Valid Perfect Square Question: Given a positive integer num, write a function which returns True if num is a perfect square else False. Note: Do not use any built-in library function such as sqrt. Example 1: Example 2: So......
leetcode perfect square --- 重点 https://leetcode.com/problems/perfect-squares/ understanding: 可以有数论,DP, BFS三种思路求解, 数论:推荐用这种方法 解法II:动态规划(Dynamic Programming) 时间复杂度:O(n * sqrt n) 初始化将dp数组置为无穷大;令dp[y * y] = 1,其中:y * y <= n。这里意思就...
In this tutorial we will see how can we check in Python if a given number is a perfect square or not without using the sqrt function in Python.
[LeetCode]Perfect Squares 作者是 在线疯狂 发布于 2015年9月9日 在LeetCode. 题目描述: Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, ...) which sum to n. For example, given n = 12, return 3 because 12 = 4 + 4 + 4; ...
DownloadRun Code Output: true 3. Using Newton’s Method Finally, we can useNewton’s methodto compute square roots. The mathematical logic behind Newton’s method is outside the scope of this article. The algorithm can be implemented as follows in C++, Java, and Python: ...
367. Valid Perfect Square刷题笔记 用二分查找可以解决 class Solution: def isPerfectSquare(self, num: int) -> bool: low= 0 high = num//2 if high<=1: return True mid =0 while low<=high: mid = (low+high)//2 square = mid*mid...