Merge branch 'master' into patch-28

problems/0518.零钱兑换II.md

@@ -33,7 +33,7 @@
 示例 3:
 输入: amount = 10, coins = [10]
 输出: 1
- 
+
 注意，你可以假设：
 
 * 0 <= amount (总金额) <= 5000
@@ -206,17 +206,23 @@ class Solution {
 ```
 
 Python：
-```python
+
+
+```python3
 class Solution:
     def change(self, amount: int, coins: List[int]) -> int:
-        dp = [0] * (amount + 1)
+        dp = [0]*(amount + 1)
         dp[0] = 1
+        # 遍历物品
         for i in range(len(coins)):
+            # 遍历背包
             for j in range(coins[i], amount + 1):
                 dp[j] += dp[j - coins[i]]
         return dp[amount]
 ```
 
+
+
 Go：