需要维护 used 中全部 O(810 + 1) 个数:32 位整型直接按照 10 个 9 计算,则最终能产生的数为 81 * 10 = 810 。 代码(Python3) class Solution: def isHappy(self, n: int) -> bool: # used 维护已出现的数字集合 used: Set[int] = set() #当 n 未出现过时,继续计算下
1 <= n <= 231 - 1 来源:力扣(LeetCode) 链接:https://leetcode-cn.com/problems/happy-number 方法: 方法一:哈希表法-可以收敛到1,肯定是有限迭代,否则一定进入循环 方法二:快慢指针-类似环形链表快慢指针相遇问题 python # 0202.快乐数 classSolution: defisHappy(self,n:int)->bool: """ 哈希法 ...
LeetCode 202 -- python 计算 happy number 第一篇贡献给python计算happy number~ defcal(n): s=str(n) sum=0foriinrange(len(s)): sum+=int(s[i])**2returnsum a=77#13 139 ok; 4 5 6 not#print (cal(a))defitr(a): log_set=set([a])whilea!=1: temp=cal(a)iftempinlog_set:ret...
什么是Happy number算法? Happy number算法的原理是什么? 如何用Python实现Happy number算法? Happy Number 算法基础概念 Happy Number 是一个数学术语,指的是一个正整数,当它的每个位上的数字的平方和替换原来的数字,并重复这个过程,最终能得到1的数。如果在这个过程中循环出现某个数字序列而不是1,则这个数不是Ha...
A happy number is a number def...lintcode-easy-Number of Islands Given a boolean 2D matrix, find the number of islands. Given graph: return 3. ...Lintcode 517. Ugly Number (Easy) (Python) Ugly Number Description: Write a program to check whether a given number is an ugly number...
print(str(num) + " is not a happy number after apply way 1"); #way 2: #Another way to do this and code is also less n=num setData=set() #set datastructure for checking a number is repeated or not. while 1: if n==1: print("{} is a happy number after apply way 2".for...
202. Happy Number刷题笔记 设了个集合来检查是否有中间结果 class Solution: def isHappy(self, n: int) -> bool: def cal_happy(n): sum = 0 while n: sum += (n%10)**2 n = n//10 return sum mid_result = {n} while True:
Run Code Time complexity O(log N). Here, N represents the number of digits in the given number num. Space Complexity O(1), as no extra space is needed. Implementation in Python def check_happy_number(i): check = set() while i != 1: ...
Java Code: importjava.util.HashSet;importjava.util.Scanner;importjava.util.Set;publicclassExample10{publicstaticbooleanisHappy_number(intnum){Set<Integer>unique_num=newHashSet<Integer>();while(unique_num.add(num)){intvalue=0;while(num>0){value+=Math.pow(num%10,2);num/=10;}num=value;}...
使用PIL 的 ImageDraw 生成验证码图片. Contribute to happy-python/check_code development by creating an account on GitHub.