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Update 0435.无重叠区间,添加C#

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Original file line number	Diff line number	Diff line change
`@@ -441,6 +441,27 @@ impl Solution {`
`441`	`441`	`}`
`442`	`442`	`}`
`443`	`443`	```
	`444`	`+### C#`
	`445`	+```csharp
	`446`	`+public class Solution`
	`447`	`+{`
	`448`	`+ public int EraseOverlapIntervals(int[][] intervals)`
	`449`	`+ {`
	`450`	`+ if (intervals.Length == 0) return 0;`
	`451`	`+ Array.Sort(intervals, (a, b) => a[1].CompareTo(b[1]));`
	`452`	`+ int res = 1, end = intervals[0][1];`
	`453`	`+ for (int i = 1; i < intervals.Length; i++)`
	`454`	`+ {`
	`455`	`+ if (end <= intervals[i][0])`
	`456`	`+ {`
	`457`	`+ end = intervals[i][1];`
	`458`	`+ res++;`
	`459`	`+ }`
	`460`	`+ }`
	`461`	`+ return intervals.Length - res;`
	`462`	`+ }`
	`463`	`+}`
	`464`	+```
`444`	`465`
`445`	`466`
`446`	`467`	`<p align="center">`

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