Commit 2977af8

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Shuo

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Merge pull request #282 from openset/develop

Add: README

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problems
- binary-tree-upside-down
  - README.md
- find-customer-referee
  - README.md

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`1`		`-## 156. Binary Tree Upside Down`
	`1`	`+<!--\|This file generated by command(leetcode description); DO NOT EDIT. \|-->`
	`2`	`+<!--+----------------------------------------------------------------------+-->`
	`3`	`+<!--\|@author Openset <openset.wang@gmail.com> \|-->`
	`4`	`+<!--\|@link https://github.com/openset \|-->`
	`5`	`+<!--\|@home https://github.com/openset/leetcode \|-->`
	`6`	`+<!--+----------------------------------------------------------------------+-->`
`2`	`7`
	`8`	`+## 156. Binary Tree Upside Down (Medium)`
	`9`	`+`
	`10`	`+`
	`11`	`+`
	`12`	`+### Related Topics`
	`13`	`+ [[Tree](https://github.com/openset/leetcode/tree/master/tag/tree/README.md)]`
	`14`	`+`
	`15`	`+### Similar Questions`
	`16`	`+ 1. [Reverse Linked List](https://github.com/openset/leetcode/tree/master/problems/reverse-linked-list) (Easy)`

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`1`		`-## 584. Find Customer Referee`
	`1`	`+<!--\|This file generated by command(leetcode description); DO NOT EDIT. \|-->`
	`2`	`+<!--+----------------------------------------------------------------------+-->`
	`3`	`+<!--\|@author Openset <openset.wang@gmail.com> \|-->`
	`4`	`+<!--\|@link https://github.com/openset \|-->`
	`5`	`+<!--\|@home https://github.com/openset/leetcode \|-->`
	`6`	`+<!--+----------------------------------------------------------------------+-->`
`2`	`7`
	`8`	`+## 584. Find Customer Referee (Easy)`
	`9`	`+`
	`10`	`+<p>Given a table <code>customer</code> holding customers information and the referee.</p>`
	`11`	`+`
	`12`	`+<pre>`
	`13`	`++------+------+-----------+`
	`14`	`+\| id \| name \| referee_id\|`
	`15`	`++------+------+-----------+`
	`16`	`+\| 1 \| Will \| NULL \|`
	`17`	`+\| 2 \| Jane \| NULL \|`
	`18`	`+\| 3 \| Alex \| 2 \|`
	`19`	`+\| 4 \| Bill \| NULL \|`
	`20`	`+\| 5 \| Zack \| 1 \|`
	`21`	`+\| 6 \| Mark \| 2 \|`
	`22`	`++------+------+-----------+`
	`23`	`+</pre>`
	`24`	`+`
	`25`	`+<p>Write a query to return the list of customers <b>NOT</b> referred by the person with id '2'.</p>`
	`26`	`+`
	`27`	`+<p>For the sample data above, the result is:</p>`
	`28`	`+<pre>`
	`29`	`++------+`
	`30`	`+\| name \|`
	`31`	`++------+`
	`32`	`+\| Will \|`
	`33`	`+\| Jane \|`
	`34`	`+\| Bill \|`
	`35`	`+\| Zack \|`
	`36`	`++------+`
	`37`	`+</pre>`
	`38`	`+`
	`39`	`+### Hints`
	`40`	`+ 1. Be careful of the NULL value`

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