题目：请实现一个函数，把字符串中的每个空格替换成“%20”。例如输入“We are happy.”,则输出“We%20are%20happy.”。解题思路：以时间效率优先的话，可以分为两种处理办法，一种利用辅助内存，即新开辟一个数组，时间复杂度为O(n)另一种不用辅助内存，即在原数组上操作：1.先遍...
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2015-05-04 22:04:00
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May is finally here, which I have been looking forward for a while.The past month--April has been really terrible and troublesome, even though I had t...
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2015-05-04 17:51:47
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1 题目描述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 i...
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2015-05-04 17:29:12
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https://leetcode.com/problems/happy-number/Write an algorithm to determine if a number is "happy".A happy number is a number defined by the following ...
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2015-05-04 15:12:32
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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...
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2015-05-03 10:43:52
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1. 题目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 square...
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2015-05-01 14:50:56
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题目：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 inte...
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2015-05-01 07:10:07
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public class Solution { public boolean isHappy(int n) { int sum=0; if(n==1||n==7) return true; else if(n>1&&n0){ ...
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2015-04-30 23:07:25
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Happy NumberWrite an algorithm to determine if a number is "happy".A happy number is a number defined by the following process: Starting with any posi...
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2015-04-30 21:51:17
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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 th...
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2015-04-30 18:20:49
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