Sep 28, 2022 · Sep 25, 2022 · Sep 25, 2022 · Sep 25, 2022 · Sep 25, 2022 · Sep 28, 2022
diff --git a/problems/0509.斐波那契数.md b/problems/0509.斐波那契数.md
Original file line number	Diff line number	Diff line change
Expand Up		@@ -370,5 +370,45 @@ object Solution {
		}
		```

	### C#

	动态规划:

	```c#
	public class Solution
	{
	public int Fib(int n)
	{
	if(n<2) return n;
	int[] dp = new int[2] { 0, 1 };
	for (int i = 2; i <= n; i++)
	{
	int temp = dp[0] + dp[1];
	dp[0] = dp[1];
	dp[1] = temp;
	}
	return dp[1];
	}
	}
	```

	递归:

	```c#
	public class Solution
	{
	public int Fib(int n)
	{
	if(n<2)
	return n;
	return Fib(n-1)+Fib(n-2);
	}
	}
	```





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		<div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>