diff --git a/problems/0062.不同路径.md b/problems/0062.不同路径.md
index 5790df69..79e49b87 100644
--- a/problems/0062.不同路径.md
+++ b/problems/0062.不同路径.md
@@ -452,5 +452,25 @@ object Solution {
}
```
+### c#
+
+```c#
+public class Solution
+{
+ public int UniquePaths(int m, int n)
+ {
+ int[] dp = new int[n];
+ for (int i = 0; i < n; i++)
+ dp[i] = 1;
+ for (int i = 1; i < m; i++)
+ for (int j = 1; j < n; j++)
+ dp[j] += dp[j - 1];
+ return dp[n - 1];
+ }
+}
+```
+
+
+
-----------------------
diff --git a/problems/0070.爬楼梯.md b/problems/0070.爬楼梯.md
index 0a6acf7f..903e8d58 100644
--- a/problems/0070.爬楼梯.md
+++ b/problems/0070.爬楼梯.md
@@ -425,5 +425,25 @@ object Solution {
}
```
+### C#
+
+```c#
+public class Solution {
+ public int ClimbStairs(int n) {
+ if(n<=2) return n;
+ int[] dp = new int[2] { 1, 2 };
+ for (int i = 3; i <= n; i++)
+ {
+ int temp = dp[0] + dp[1];
+ dp[0] = dp[1];
+ dp[1] = temp;
+ }
+ return dp[1];
+ }
+}
+```
+
+
+
-----------------------
diff --git a/problems/0509.斐波那契数.md b/problems/0509.斐波那契数.md
index 0b53e698..4c9317bc 100644
--- a/problems/0509.斐波那契数.md
+++ b/problems/0509.斐波那契数.md
@@ -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);
+ }
+}
+```
+
+
+
+
+
-----------------------
diff --git a/problems/0746.使用最小花费爬楼梯.md b/problems/0746.使用最小花费爬楼梯.md
index 9d3bd7fa..4a4c0b65 100644
--- a/problems/0746.使用最小花费爬楼梯.md
+++ b/problems/0746.使用最小花费爬楼梯.md
@@ -370,5 +370,26 @@ object Solution {
}
```
+### C#
+
+```c#
+public class Solution
+{
+ public int MinCostClimbingStairs(int[] cost)
+ {
+ int[] dp=new int[2] { cost[0], cost[1] };
+ for (int i = 2; i < cost.Length; i++)
+ {
+ int temp = Math.Min(dp[0], dp[1])+cost[i];
+ dp[0]=dp[1];
+ dp[1]=temp;
+ }
+ return Math.Min(dp[0],dp[1]);
+ }
+}
+```
+
+
+
-----------------------
