Update 0322.零钱兑换.md

problems/0322.零钱兑换.md

@@ -336,6 +336,28 @@ impl Solution {
 }
 ```
 
+```rust
+// 遍历背包
+impl Solution {
+    pub fn coin_change(coins: Vec<i32>, amount: i32) -> i32 {
+        let amount = amount as usize;
+        let mut dp = vec![i32::MAX; amount + 1];
+        dp[0] = 0;
+        for i in 0..=amount {
+            for &coin in &coins {
+                if i >= coin as usize && dp[i - coin as usize] != i32::MAX {
+                    dp[i] = dp[i].min(dp[i - coin as usize] + 1)
+                }
+            }
+        }
+        if dp[amount] == i32::MAX {
+            return -1;
+        }
+        dp[amount]
+    }    
+}
+```
+
 Javascript：
 ```javascript
 const coinChange = (coins, amount) => {