添加 0122.买卖股票的最佳时机II Rust版本

添加 0122.买卖股票的最佳时机II Rust版本（贪心+动态规划）

problems/0122.买卖股票的最佳时机II.md

@@ -282,6 +282,43 @@ function maxProfit(prices: number[]): number {
 };
 ```
 
+### Rust
+
+贪心：
+```Rust
+impl Solution {
+    fn max(a: i32, b: i32) -> i32 {
+        if a > b { a } else { b }
+    }
+    pub fn max_profit(prices: Vec<i32>) -> i32 {
+        let mut result = 0;
+        for i in 1..prices.len() {
+            result += Self::max(prices[i] - prices[i - 1], 0);
+        }
+        result
+    }
+}
+```
+
+动态规划：
+```Rust
+impl Solution {
+    fn max(a: i32, b: i32) -> i32 {
+        if a > b { a } else { b }
+    }
+    pub fn max_profit(prices: Vec<i32>) -> i32 {
+        let n = prices.len();
+        let mut dp = vec![vec![0; 2]; n];
+        dp[0][0] -= prices[0];
+        for i in 1..n {
+            dp[i][0] = Self::max(dp[i - 1][0], dp[i - 1][1] - prices[i]);
+            dp[i][1] = Self::max(dp[i - 1][1], dp[i - 1][0] + prices[i]);
+        }
+        Self::max(dp[n - 1][0], dp[n - 1][1])
+    }
+}
+```
+
 ### C:
 贪心：
 ```c