Update 0123.买卖股票的最佳时机III.md 使用元祖优化命名

problems/0123.买卖股票的最佳时机III.md

@@ -447,15 +447,15 @@ impl Solution {
 ```rust
 impl Solution {
     pub fn max_profit(prices: Vec<i32>) -> i32 {
-        let mut dp = vec![0, -prices[0], 0, -prices[0], 0];
+        let (mut one_buy, mut one_sale, mut two_buy, mut two_sale) = (-prices[0], 0, -prices[0], 0);
 
         for p in prices {
-            dp[1] = dp[1].max(-p);
-            dp[2] = dp[2].max(dp[1] + p);
-            dp[3] = dp[3].max(dp[2] - p);
-            dp[4] = dp[4].max(dp[3] + p);
+            one_buy = one_buy.max(-p);
+            one_sale = one_sale.max(p + one_buy);
+            two_buy = two_buy.max(one_sale - p);
+            two_sale = two_sale.max(two_buy + p);
         }
-        dp[4]
+        two_sale
     }    
 }
 ```