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Add C# solutions

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README.md
September-LeetCoding-Challenge
- 18-Best-Time-to-Buy-and-Sell-Stock
  - Best-Time-to-Buy-and-Sell-Stock.cs
- 19-Sequential-Digits
  - Sequential-Digits.cs

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`@@ -24,6 +24,8 @@ Solutions in various programming languages are provided. Enjoy it.`
`24`	`24`	`15.[Length of Last Word](https://github.com/AlgoStudyGroup/Leetcode/tree/master/September-LeetCoding-Challenge/15-Length-of-Last-Word)`
`25`	`25`	`16.[Maximum XOR of Two Numbers in an Array](https://github.com/AlgoStudyGroup/Leetcode/tree/master/September-LeetCoding-Challenge/16-Maximum-XOR-of-Two-Numbers-in-an-Array)`
`26`	`26`	`17.[Robot Bounded In Circle](https://github.com/AlgoStudyGroup/Leetcode/tree/master/September-LeetCoding-Challenge/17-Robot-Bounded-In-Circle)`
	`27`	`+18.[Best Time to Buy and Sell Stock](https://github.com/AlgoStudyGroup/Leetcode/tree/master/September-LeetCoding-Challenge/18-Best-Time-to-Buy-and-Sell-Stock)`
	`28`	`+19.[Sequential Digits](https://github.com/AlgoStudyGroup/Leetcode/tree/master/September-LeetCoding-Challenge/19-Sequential-Digits)`
`27`	`29`
`28`	`30`	`##August LeetCoding Challenge`
`29`	`31`	`Click[here](https://leetcode.com/explore/challenge/card/august-leetcoding-challenge/) for problem descriptions.`

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	`1`	`+publicclassSolution{`
	`2`	`+publicintMaxProfit(int[]prices){`
	`3`	`+if(prices==null\|\|prices.Length==0)return0;`
	`4`	`+intmin=prices[0],max=0;`
	`5`	`+for(inti=1;i<prices.Length;i++){`
	`6`	`+min=Math.Min(min,prices[i]);`
	`7`	`+max=Math.Max(max,prices[i]-min);`
	`8`	`+}`
	`9`	`+returnmax;`
	`10`	`+}`
	`11`	`+}`

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	`1`	`+publicclassSolution{`
	`2`	`+publicIList<int>SequentialDigits(intlow,inthigh){`
	`3`	`+int[]allNums={12,23,34,45,56,67,78,89,`
	`4`	`+123,234,345,456,567,678,789,`
	`5`	`+1234,2345,3456,4567,5678,6789,`
	`6`	`+12345,23456,34567,45678,56789,`
	`7`	`+123456,234567,345678,456789,`
	`8`	`+1234567,2345678,3456789,`
	`9`	`+12345678,23456789,`
	`10`	`+123456789};`
	`11`	`+varres=newList<int>();`
	`12`	`+intn=allNums.Length;`
	`13`	`+for(inti=0;i<n;i++){`
	`14`	`+if(allNums[i]<low)continue;`
	`15`	`+if(allNums[i]>high)break;`
	`16`	`+res.Add(allNums[i]);`
	`17`	`+}`
	`18`	`+returnres;`
	`19`	`+}`
	`20`	`+}`

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