diff --git a/leetcode/1518.Water-Bottles/README.md b/leetcode/1518.Water-Bottles/README.md
index ebbfb401..3f05e181 100644
--- a/leetcode/1518.Water-Bottles/README.md
+++ b/leetcode/1518.Water-Bottles/README.md
@@ -1,4 +1,4 @@
-# [1518. Water Bottles](https://leetcode-cn.com/problems/water-bottles/)
+# [1518. Water Bottles](https://leetcode.com/problems/water-bottles/)
## 题目
@@ -51,8 +51,7 @@ Return the maximum number of water bottles you can drink.
## 解题思路
-- 模拟
-首先我们一定可以喝到 numBottles 瓶酒，剩下 numBottles 个空瓶。接下来我们可以拿空瓶子换酒，每次拿出 numExchange 个瓶子换一瓶酒，然后再喝完这瓶酒，得到一个空瓶。这样模拟下去，直到所有的空瓶子小于numExchange结束
+- 模拟。首先我们一定可以喝到 numBottles 瓶酒，剩下 numBottles 个空瓶。接下来我们可以拿空瓶子换酒，每次拿出 numExchange 个瓶子换一瓶酒，然后再喝完这瓶酒，得到一个空瓶。这样模拟下去，直到所有的空瓶子小于numExchange结束。
## 代码
diff --git a/website/content/ChapterFour/1500~1599/1512.Number-of-Good-Pairs.md b/website/content/ChapterFour/1500~1599/1512.Number-of-Good-Pairs.md
index e9146c75..009b74b3 100644
--- a/website/content/ChapterFour/1500~1599/1512.Number-of-Good-Pairs.md
+++ b/website/content/ChapterFour/1500~1599/1512.Number-of-Good-Pairs.md
@@ -70,5 +70,5 @@ func numIdenticalPairs(nums []int) int {
----------------------------------------------
diff --git a/website/content/ChapterFour/1500~1599/1518.Water-Bottles.md b/website/content/ChapterFour/1500~1599/1518.Water-Bottles.md
new file mode 100644
index 00000000..e7817708
--- /dev/null
+++ b/website/content/ChapterFour/1500~1599/1518.Water-Bottles.md
@@ -0,0 +1,81 @@
+# [1518. Water Bottles](https://leetcode.com/problems/water-bottles/)
+
+## 题目
+
+Given numBottles full water bottles, you can exchange numExchange empty water bottles for one full water bottle.
+
+The operation of drinking a full water bottle turns it into an empty bottle.
+
+Return the maximum number of water bottles you can drink.
+
+**Example 1**:
+
+
+
+ Input: numBottles = 9, numExchange = 3
+ Output: 13
+ Explanation: You can exchange 3 empty bottles to get 1 full water bottle.
+ Number of water bottles you can drink: 9 + 3 + 1 = 13.
+
+**Example 2**:
+
+
+
+ Input: numBottles = 15, numExchange = 4
+ Output: 19
+ Explanation: You can exchange 4 empty bottles to get 1 full water bottle.
+ Number of water bottles you can drink: 15 + 3 + 1 = 19.
+
+**Example 3**:
+
+ Input: numBottles = 5, numExchange = 5
+ Output: 6
+
+**Example 4**:
+
+ Input: numBottles = 2, numExchange = 3
+ Output: 2
+
+**Constraints:**
+
+- 1 <= numBottles <= 100
+- 2 <= numExchange <= 100
+
+## 题目大意
+
+小区便利店正在促销，用 numExchange 个空酒瓶可以兑换一瓶新酒。你购入了 numBottles 瓶酒。
+
+如果喝掉了酒瓶中的酒，那么酒瓶就会变成空的。
+
+请你计算 最多 能喝到多少瓶酒。
+
+## 解题思路
+
+- 模拟。首先我们一定可以喝到 numBottles 瓶酒，剩下 numBottles 个空瓶。接下来我们可以拿空瓶子换酒，每次拿出 numExchange 个瓶子换一瓶酒，然后再喝完这瓶酒，得到一个空瓶。这样模拟下去，直到所有的空瓶子小于numExchange结束。
+
+## 代码
+
+```go
+package leetcode
+
+func numWaterBottles(numBottles int, numExchange int) int {
+ if numBottles < numExchange {
+ return numBottles
+ }
+ quotient := numBottles / numExchange
+ reminder := numBottles % numExchange
+ ans := numBottles + quotient
+ for quotient+reminder >= numExchange {
+ quotient, reminder = (quotient+reminder)/numExchange, (quotient+reminder)%numExchange
+ ans += quotient
+ }
+ return ans
+}
+```
+
+
+----------------------------------------------
+
diff --git a/website/content/ChapterFour/1500~1599/1539.Kth-Missing-Positive-Number.md b/website/content/ChapterFour/1500~1599/1539.Kth-Missing-Positive-Number.md
index 737f3163..c22e07e0 100644
--- a/website/content/ChapterFour/1500~1599/1539.Kth-Missing-Positive-Number.md
+++ b/website/content/ChapterFour/1500~1599/1539.Kth-Missing-Positive-Number.md
@@ -65,6 +65,6 @@ func findKthPositive(arr []int, k int) int {
----------------------------------------------
diff --git a/website/content/ChapterTwo/Math.md b/website/content/ChapterTwo/Math.md
index 5e3fb52c..33d8a2aa 100644
--- a/website/content/ChapterTwo/Math.md
+++ b/website/content/ChapterTwo/Math.md
@@ -129,6 +129,7 @@ weight: 12
|1442|Count Triplets That Can Form Two Arrays of Equal XOR|[Go]({{< relref "/ChapterFour/1400~1499/1442.Count-Triplets-That-Can-Form-Two-Arrays-of-Equal-XOR.md" >}})|Medium||||74.0%|
|1486|XOR Operation in an Array|[Go]({{< relref "/ChapterFour/1400~1499/1486.XOR-Operation-in-an-Array.md" >}})|Easy||||84.1%|
|1512|Number of Good Pairs|[Go]({{< relref "/ChapterFour/1500~1599/1512.Number-of-Good-Pairs.md" >}})|Easy||||87.7%|
+|1518|Water Bottles|[Go]({{< relref "/ChapterFour/1500~1599/1518.Water-Bottles.md" >}})|Easy||||60.4%|
|1551|Minimum Operations to Make Array Equal|[Go]({{< relref "/ChapterFour/1500~1599/1551.Minimum-Operations-to-Make-Array-Equal.md" >}})|Medium||||80.7%|
|1573|Number of Ways to Split a String|[Go]({{< relref "/ChapterFour/1500~1599/1573.Number-of-Ways-to-Split-a-String.md" >}})|Medium||||31.7%|
|1648|Sell Diminishing-Valued Colored Balls|[Go]({{< relref "/ChapterFour/1600~1699/1648.Sell-Diminishing-Valued-Colored-Balls.md" >}})|Medium||||31.7%|