leetcode 202. Happy Number

传送门

202. Happy Number

My Submissions

Question

Total Accepted: 56706 Total Submissions: 158441 Difficulty: Easy

Write an algorithm to determine if a number is "happy".

A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. Those numbers for which this process ends in 1 are happy numbers.

Example: 19 is a happy number

12 + 92 = 82
82 + 22 = 68
62 + 82 = 100
12 + 02 + 02 = 1

Credits:
Special thanks to @mithmatt and @ts for adding this problem and creating all test cases.

Subscribe to see which companies asked this question

Hide Tags

Hash Table Math

Show Similar Problems

按公式计算，判断一个数是不是happy number

 1 class Solution {
 2 public:
 3     bool isHappy(int n) {
 4         if(n < 0) return false;
 5         map<int,int> mp;
 6         while(n != 1){
 7             if(mp[n] == 1) return false;
 8             mp[n] = 1;
 9             n = calculate(n);
10         }
11         return true;
12     }
13     int calculate(int n)
14     {
15         int ret = 0;
16         int temp = 0;
17         while(n){
18             temp = n % 10;
19             ret += (temp * temp);
20             n /= 10;
21         }
22         return ret;
23     }
24 };

转载于:https://www.cnblogs.com/njczy2010/p/5227607.html

leetcode 202. Happy Number相关推荐

[LeetCode]202. Happy Number（平衡二叉树哈希表）
Write an algorithm to determine if a number is "happy". A happy number is a number defined ...
python leetcode 202. Happy Number
类似于链表环中快慢指针的思想 class Solution(object):def isHappy(self, n):""":type n: int:rtype: boo ...
leetcode 202.Happy Number （python3 ）
题目: 题目分析:首先,本题需要判定输入的整数其各位数平方求和最终值是否为1 ?输入整数位整型,返回值为布尔型. 编程思路: 1.需要利用到循环实现每一次求和后判定是否为1 . 2.需要排除有可能出现 ...
LeetCode 202. Happy Number--Python解法--数学题
此文首发于我的个人博客:LeetCode 202. Happy Number–Python解法–数学题 - zhang0peter的个人博客 LeetCode题解专栏:LeetCode题解 LeetC ...
LeetCode：Largest Number - 求整型数组中各元素可拼合成的最大数字
2019独角兽企业重金招聘Python工程师标准>>> 1.题目名称 Largest Number(求整型数组中各元素可拼合成的最大数字) 2.题目地址 https://leetco ...
【整数转字符串】LeetCode 9. Palindrome Number
LeetCode 9. Palindrome Number Solution1: 不利用字符串 class Solution { public:bool isPalindrome(int x) {if ...
【To Do! 重点正则表达式】LeetCode 65. Valid Number
LeetCode 65. Valid Number 本博客转载自:[1]http://www.cnblogs.com/yuzhangcmu/p/4060348.html [2]https://blog ...
【回文串2】LeetCode 9. Palindrome Number
LeetCode 9. Palindrome Number Solution1:我的答案思路一:转化为字符串 class Solution { public:bool isPalindrome(in ...
【？异或】LeetCode 260. Single Number III
LeetCode 260. Single Number III Solution1: 博客转载自:http://www.cnblogs.com/grandyang/p/4741122.html 这道题 ...

leetcode 202. Happy Number

202. Happy Number

leetcode 202. Happy Number相关推荐

最新文章

热门文章