Update 0122.买卖股票的最佳时机II.md

problems/0122.买卖股票的最佳时机II.md

@@ -274,6 +274,7 @@ const maxProfit = (prices) => {
 
 ### TypeScript：
 
+贪心
 ```typescript
 function maxProfit(prices: number[]): number {
     let resProfit: number = 0;
@@ -284,6 +285,21 @@ function maxProfit(prices: number[]): number {
 };
 ```
 
+动态规划
+```typescript
+function maxProfit(prices: number[]): number {
+  const dp = Array(prices.length)
+    .fill(0)
+    .map(() => Array(2).fill(0))
+  dp[0][0] = -prices[0]
+  for (let i = 1; i < prices.length; i++) {
+    dp[i][0] = Math.max(dp[i - 1][0], dp[i - 1][1] - prices[i])
+    dp[i][1] = Math.max(dp[i - 1][1], dp[i - 1][0] + prices[i])
+  }
+  return dp[prices.length - 1][1]
+}
+```
+
 ### Rust
 
 贪心：