202. Happy Number 解题方法 设置一个字典dic,当n不在字典中时,计算下一个数并加到字典中,如果下一个数算出来是1,就返回True,否则继续算新的n。如果找到一个n在字典中,就不做循环了直接返回False。 时间复杂度:O(logn) 空间复杂度:O(logn) 代码 classSolution:defisHappy(self,n:int)->bool:dic={}whilen not in dic:dic[n]=1temp=0whilen:t...
我的题解代码如下,leetcode上运行时间0ms,内存占用5.2MB intgetNext(intn){intsum=0;while(n>0){inttmp=n%10; sum+=tmp*tmp; n/=10; }returnsum; }boolisHappy(intn){intslowptr,fastptr; slowptr=n; fastptr=getNext(n);while(fastptr!=1&& fastptr!=slowptr){ slowptr=getNext(slowptr);...
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,继续计算下一个数 while n not in used: # 标记 n 已出现过 used.add(n) # 计算下一个数,即求 n 的每一位的平方和 nxt: int = 0 #当 n ...
Can you solve this real interview question? Happy Number - Write an algorithm to determine if a number n 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
leetcode 202. Happy Number class Solution { public: bool isHappy(int n) { if(n <= 0) return false; set<int> res; while(res.count(n) == 0){ res.insert(n); int num = 0; while(n != 0){ num += (n%10)*(n%10);
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 ...
202 Happy Number // #202 幸福数 描述:给定一个数,不断将此数变为此数各位数字的平方和。如果能够终止于1,则称为幸福数。所以,你幸福吗? // #202 Description: 解法1:我姓朱。 // Solution 1: I'm flappy. 代码1 // Code 1 203 Remove Linked List Elements // #203 去除链表元素 描述:删除链...
*/classSolution{privateintgetNext(int n){int totalSum=0;while(n>0){int d=n%10;n=n/10;totalSum+=d*d;}returntotalSum;}publicbooleanisHappy(int n){Set<Integer>seen=newHashSet<>();while(n!=1&&!seen.contains(n)){seen.add(n);n=getNext(n);}returnn==1;}} ...
202Happy NumberC 201Bitwise AND of Numbers RangeC 200Number of IslandsC 199Binary Tree Right Side ViewC 198House RobberC 191Number of 1 BitsC 190Reverse BitsC 189Rotate ArrayC 188Best Time to Buy and Sell Stock IV 187Repeated DNA Sequences ...
191 Number of 1 Bits Easy Go 196 Delete Duplicate Emails Easy MySQL 197 Rising Temperature Easy MySQL 199 Binary Tree Right Side View Medium Go 202 Happy Number Easy Go 206 Reverse Linked List Easy Go 208 Implement Trie (Prefix Tree) Medium Go 215 Kth Largest Element in an Array Medium Go...