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Commit 4ab7a26

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docs: update solution 202, add a new contributor @Wushiyii 
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‎README.md‎

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@@ -34,5 +34,6 @@ I'm looking for long-term contributors/partners to this repo! Send me [PRs](http
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|---|---|---|---|---|---|---|---|
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| <center> [<img src="https://avatars3.githubusercontent.com/u/20679510?v=4" width="80px;"/>](https://github.com/Mrzhudky) </center> | <center> [<img src="https://avatars3.githubusercontent.com/u/44309823?v=4" width="80px;"/>](https://github.com/KongJHong) </center> | <center> [<img src="https://avatars3.githubusercontent.com/u/18181519?v=4" width="80px;"/>](https://github.com/limbowandering) </center> | <center> [<img src="https://avatars3.githubusercontent.com/u/37685012?v=4" width="80px;"/>](https://github.com/jxdeng3989) </center> | <center> [<img src="https://avatars3.githubusercontent.com/u/44314231?v=4" width="80px;"/>](https://github.com/igayhub) </center> | <center> [<img src="https://avatars3.githubusercontent.com/u/30177307?v=4" width="80px;"/>](https://github.com/MCN1998) </center> | <center> [<img src="https://avatars3.githubusercontent.com/u/5793058?v=4" width="80px;"/>](https://github.com/Fairyhead) </center> | <center> [<img src="https://avatars3.githubusercontent.com/u/24841082?v=4" width="80px;"/>](https://github.com/zhng1456) </center> |
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| <center> [<img src="https://avatars3.githubusercontent.com/u/32598987?v=4" width="80px;"/>](https://github.com/xiapengchng) </center> | <center> [<img src="https://avatars3.githubusercontent.com/u/37660444?v=4" width="80px;"/>](https://github.com/Mcnwork2018) </center> | <center> [<img src="https://avatars3.githubusercontent.com/u/22535595?v=4" width="80px;"/>](https://github.com/bluesword12350) </center> | <center> [<img src="https://avatars3.githubusercontent.com/u/39827514?v=4" width="80px;"/>](https://github.com/ashwek) </center> | <center> [<img src="https://avatars3.githubusercontent.com/u/25475525?v=4" width="80px;"/>](https://github.com/Mrtj2016) </center> | <center> [<img src="https://avatars3.githubusercontent.com/u/19249839?v=4" width="80px;"/>](https://github.com/biubiubiubiubiubiubiu) </center> | <center> [<img src="https://avatars3.githubusercontent.com/u/31436272?v=4" width="80px;"/>](https://github.com/Neil94n) </center> | <center> [<img src="https://avatars3.githubusercontent.com/u/9976942?v=4" width="80px;"/>](https://github.com/LZHD) </center> |
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| <center> [<img src="https://avatars3.githubusercontent.com/u/31801502?v=4" width="80px;"/>](https://github.com/Wushiyii) </center> | | | | | | | |
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<!-- ALL-CONTRIBUTORS-LIST:END -->

‎SOLUTION_TREE.md‎

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├── 0200.Number of Islands
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│ ├── README.md
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│ └── Solution.py
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├── 0202.Happy Number
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│ ├── README.md
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│ └── Solution.java
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├── 0203.Remove Linked List Elements
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│ ├── README.md
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│ ├── Solution.java
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│ ├── Solution.cpp
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│ ├── Solution.js
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│ └── Solution.py
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├── 0423.Reconstruct Original Digits from English
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│ └── Solution.cpp
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├── 0427.Construct Quad Tree
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│ └── Solution.cpp
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├── 0434.Number of Segments in a String

‎solution/0202.Happy Number/README.md‎

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对于一个正整数,每一次将该数替换为它每个位置上的数字的平方和,然后重复这个过程直到这个数变为 1,也可能是无限循环但始终变不到 1。如果可以变为 1,那么这个数就是快乐数。
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示例:
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**示例**:
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```
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输入: 19
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输出: true
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```
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### 解法
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在进行验算的过程中,发现一个规律,只要过程中得到任意一个结果和为4,那么就一定会按 `4 → 16 → 37 → 58 → 89 → 145 → 42 → 20 → 4`
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进行循环,这样的数就不为快乐数;此外,结果和与若是与输入n或者上一轮结果和n相同,那也不为快乐数.
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在进行验算的过程中,发现一个规律,只要过程中得到任意一个结果和为 4,那么就一定会按 `4 → 16 → 37 → 58 → 89 → 145 → 42 → 20 → 4`
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进行循环,这样的数就不为快乐数;此外,结果和与若是与输入 n 或者上一轮结果和 n 相同,那也不为快乐数。
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```java
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class Solution {
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public boolean isHappy(int n) {
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if (n <= 0) return false;
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int sum = 0;
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while (sum != n) {
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while (n > 0) {
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sum += Math.pow(n % 10 ,2);
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n /= 10;
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}
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if (sum == 1) {
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return true;
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} else if (sum == 4) {
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return false;
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} else {
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n = sum;
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sum = 0;
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}
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}
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return false;
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}
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}
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// 递归
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public boolean isHappy(int n) {
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if (n <= 0) return false;
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int sum = 0;
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while (sum != n) {
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while (n > 0) {
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sum += Math.pow(n % 10 ,2);
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sum += Math.pow(n % 10, 2);
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n /= 10;
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}
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if (sum == 1) {
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return true;
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} else if (sum == 4) {
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return false;
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} else {
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return isHappy(sum);
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}
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if (sum == 1) return true;
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if (sum == 4) return false;
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n = sum;
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sum = 0;
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}
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return false;
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}
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}
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```
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class Solution {
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public boolean isHappy(int n) {
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if (n <= 0) return false;
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sum += Math.pow(n % 10, 2);
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n /= 10;
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}
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if (sum == 1) {
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return true;
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} else if (sum == 4) {
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return false;
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} else {
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n = sum;
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sum = 0;
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}
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if (sum == 1) return true;
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if (sum == 4) return false;
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n = sum;
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sum = 0;
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}
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return false;
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}
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}
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// 递归
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public boolean isHappy2(int n) {
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// 递归
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class Solution {
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public boolean isHappy(int n) {
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if (n <= 0) return false;
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int sum = 0;
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while (n > 0) {
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sum += Math.pow(n % 10, 2);
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n /= 10;
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}
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if (sum == 1) {
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return true;
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} else if (sum == 4) {
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return false;
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} else {
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return isHappy2(sum);
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}
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if (sum == 1) return true;
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if (sum == 4) return false;
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return isHappy(sum);
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}
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}

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