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Add C# solutions

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October-LeetCoding-Challenge/04-Remove-Covered-Intervals
- Remove-Covered-Intervals.cs
README.md

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	`1`	`+public class Solution {`
	`2`	`+ public int RemoveCoveredIntervals(int[][] intervals) {`
	`3`	`+ Array.Sort(intervals, (x, y) => x[0]==y[0] ? y[1]-x[1] : x[0]-y[0]);`
	`4`	`+ int count = 0;`
	`5`	`+ int curr = 0;`
	`6`	`+ foreach(int[] interval in intervals){`
	`7`	`+ if(curr < interval[1]){`
	`8`	`+ curr = interval[1];`
	`9`	`+ count++;`
	`10`	`+ }`
	`11`	`+ }`
	`12`	`+ return count;`
	`13`	`+ }`
	`14`	`+}`

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`@@ -9,7 +9,7 @@ Click [here](https://leetcode.com/explore/challenge/card/october-leetcoding-chal`
`9`	`9`	`Solutions in various programming languages are provided. Enjoy it.`
`10`	`10`
`11`	`11`	`1. [Number of Recent Calls](https://github.com/AlgoStudyGroup/Leetcode/tree/master/October-LeetCoding-Challenge/01-Number-of-Recent-Calls) : Queue`
`12`		`-`
	`12`	`+4.[Remove Covered Intervals](https://github.com/AlgoStudyGroup/Leetcode/tree/master/October-LeetCoding-Challenge/04-Remove-Covered-Intervals)`
`13`	`13`
`14`	`14`	`## September LeetCoding Challenge`
`15`	`15`	`Click [here](https://leetcode.com/explore/challenge/card/september-leetcoding-challenge) for problem descriptions.`

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