新增 0309.最佳买卖股票时机含冷冻期.md Go解法

problems/0309.最佳买卖股票时机含冷冻期.md

@@ -208,6 +208,40 @@ class Solution:
 ```
 
 Go：
+```go
+// 最佳买卖股票时机含冷冻期 动态规划
+// 时间复杂度O(n) 空间复杂度O(n)
+func maxProfit(prices []int) int {
+    n := len(prices)
+    if n < 2 {
+        return 0
+    }
+
+    dp := make([][]int, n)
+    status := make([]int, n * 4)
+    for i := range dp {
+        dp[i] = status[:4]
+        status = status[4:]
+    }
+    dp[0][0] = -prices[0]
+    
+    for i := 1; i < n; i++ {
+        dp[i][0] = max(dp[i - 1][0], max(dp[i - 1][1] - prices[i], dp[i - 1][3] - prices[i]))
+        dp[i][1] = max(dp[i - 1][1], dp[i - 1][3])
+        dp[i][2] = dp[i - 1][0] + prices[i]
+        dp[i][3] = dp[i - 1][2]
+    }
+    
+    return max(dp[n - 1][1], max(dp[n - 1][2], dp[n - 1][3]))
+}
+
+func max(a, b int) int {
+    if a > b {
+        return a
+    }
+    return b
+}
+```
 
 Javascript: