Import C# solutions from https://github.com/kfstorm/LeetCode#245

Merged

yanglbme merged 2 commits intodoocs:masterfrom kfstorm:add_csharp

Jan 26, 2020

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Commits on Jan 26, 2020

Import C# solutions from https://github.com/kfstorm/LeetCode
kfstorm
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Update code due to update of test cases and interfaces
kfstorm
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