Update 0376.摆动序列.md

problems/0376.摆动序列.md

@@ -479,6 +479,30 @@ impl Solution {
 }
 ```
 
+**动态规划**
+
+```rust
+impl Solution {
+    pub fn wiggle_max_length(nums: Vec<i32>) -> i32 {
+        if nums.len() == 1 {
+            return 1;
+        }
+        let (mut down, mut up) = (1, 1);
+        for i in 1..nums.len() {
+            // i - 1 为峰顶
+            if nums[i] < nums[i - 1] {
+                down = down.max(up + 1);
+            }
+            // i - 1 为峰谷
+            if nums[i] > nums[i - 1] {
+                up = up.max(down + 1);
+            }
+        }
+        down.max(up)
+    }
+}
+```
+
 ### C
 **贪心**