leetcode 202 Happy Number 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...
https://leetcode.com/problems/happy-number/ https://leetcode.com/problems/happy-number/discuss/56913/Beat-90-Fast-Easy-Understand-Java-Solution-with-Brief-Explanation https://leetcode.com/problems/happy-number/discuss/56917/My-solution-in-C(-O(1)-space-and-no-magic-math-property-involved-) ...
Leetcode c语言-Longest Common Prefix Title: Write a function to find the longest common prefix string amongst an array of strings. 这道题目不难,唯一要注意的是二重指针的使用,因为给了一个字符串数组,也就是一个二维数组,strs[][],对于第一个字符串,应该是strs[0],对于第一个字符串中的第一个...
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); n = n/10; } if(num == 1) return true; n = num; } return false; } }; 1. 2. 3. 4. 5. 6....
LeetCode:Unique Morse Code Words 804. Unique Morse Code Words DescriptionHintsSubmissionsDiscussSolution Pick One International Morse Code defines a standard encoding where each letter is mapped to a series of dots and dashes, a...17 Unique Morse Code Words 题目International Morse Code defines a...
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October1_leetcode.cpp Palindrom.cpp Print.py Prob_C.cpp README.md ReverseNumber.java SelectionSort.cpp Simpleform.html SparseMatrix.cpp StructuredArray.cpp Sum_complex_number.py Swaping.py The Coin change prob solution ThreeSumZero.java
链接:http://leetcode.com/problemset/algorithms/ 题解: 判断一个数字是否为Happy Number。这道题跟求无限循环小数很像,最好维护一个HashSet,假如遇见重复,则返回false。否则替换n为digits square root sum,当n == 1时循环结束返回true。 Time Complexity - O(n), Space Complexity - O(n)。
leetcode:HappyNumber,House Robber 1.Happy Number 这个题中收获2点: 1.拿到题以后考虑特殊情况,代码中考虑1和4,或者说<6的情况,动手算下。(可能要在代码一步步测试中发现,目前还不知道怎么知道这些特殊情况) 2.数字的每一位时,n%10,n/10。(3/7的余数为3,7/3的余数为4) ...
C -> 3 ... Z -> 26 AA -> 27 AB –> 28 这道题非常之简单,比起原题来简单不少,非常直接,就是一个进制的问题。代码奉上 classSolution {public:inttitleToNumber(strings) {if(s =="")return0;intresult =0;inti =0;while(s[i] !='\0') ...