feat: add weekly contest 368 (#1862)

Author: yanglbme

solution/2900-2999/2908.Minimum Sum of Mountain Triplets I/README.md

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+# [2908. 元素和最小的山形三元组 I](https://leetcode.cn/problems/minimum-sum-of-mountain-triplets-i)
+
+[English Version](/solution/2900-2999/2908.Minimum%20Sum%20of%20Mountain%20Triplets%20I/README_EN.md)
+
+## 题目描述
+
+<!-- 这里写题目描述 -->
+
+<p>给你一个下标从 <strong>0</strong> 开始的整数数组 <code>nums</code> 。</p>
+
+<p>如果下标三元组 <code>(i, j, k)</code> 满足下述全部条件，则认为它是一个 <strong>山形三元组</strong> ：</p>
+
+<ul>
+	<li><code>i &lt; j &lt; k</code></li>
+	<li><code>nums[i] &lt; nums[j]</code> 且 <code>nums[k] &lt; nums[j]</code></li>
+</ul>
+
+<p>请你找出 <code>nums</code> 中 <strong>元素和最小</strong> 的山形三元组，并返回其 <strong>元素和</strong> 。如果不存在满足条件的三元组，返回 <code>-1</code> 。</p>
+
+<p>&nbsp;</p>
+
+<p><strong class="example">示例 1：</strong></p>
+
+<pre>
+<strong>输入：</strong>nums = [8,6,1,5,3]
+<strong>输出：</strong>9
+<strong>解释：</strong>三元组 (2, 3, 4) 是一个元素和等于 9 的山形三元组，因为： 
+- 2 &lt; 3 &lt; 4
+- nums[2] &lt; nums[3] 且 nums[4] &lt; nums[3]
+这个三元组的元素和等于 nums[2] + nums[3] + nums[4] = 9 。可以证明不存在元素和小于 9 的山形三元组。
+</pre>
+
+<p><strong class="example">示例 2：</strong></p>
+
+<pre>
+<strong>输入：</strong>nums = [5,4,8,7,10,2]
+<strong>输出：</strong>13
+<strong>解释：</strong>三元组 (1, 3, 5) 是一个元素和等于 13 的山形三元组，因为： 
+- 1 &lt; 3 &lt; 5 
+- nums[1] &lt; nums[3] 且 nums[5] &lt; nums[3]
+这个三元组的元素和等于 nums[1] + nums[3] + nums[5] = 13 。可以证明不存在元素和小于 13 的山形三元组。
+</pre>
+
+<p><strong class="example">示例 3：</strong></p>
+
+<pre>
+<strong>输入：</strong>nums = [6,5,4,3,4,5]
+<strong>输出：</strong>-1
+<strong>解释：</strong>可以证明 nums 中不存在山形三元组。
+</pre>
+
+<p>&nbsp;</p>
+
+<p><strong>提示：</strong></p>
+
+<ul>
+	<li><code>3 &lt;= nums.length &lt;= 50</code></li>
+	<li><code>1 &lt;= nums[i] &lt;= 50</code></li>
+</ul>
+
+## 解法
+
+<!-- 这里可写通用的实现逻辑 -->
+
+<!-- tabs:start -->
+
+### **Python3**
+
+<!-- 这里可写当前语言的特殊实现逻辑 -->
+
+```python
+
+```
+
+### **Java**
+
+<!-- 这里可写当前语言的特殊实现逻辑 -->
+
+```java
+
+```
+
+### **C++**
+
+```cpp
+
+```
+
+### **Go**
+
+```go
+
+```
+
+### **...**
+
+```
+
+```
+
+<!-- tabs:end -->

solution/2900-2999/2908.Minimum Sum of Mountain Triplets I/README_EN.md

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+# [2908. Minimum Sum of Mountain Triplets I](https://leetcode.com/problems/minimum-sum-of-mountain-triplets-i)
+
+[中文文档](/solution/2900-2999/2908.Minimum%20Sum%20of%20Mountain%20Triplets%20I/README.md)
+
+## Description
+
+<p>You are given a <strong>0-indexed</strong> array <code>nums</code> of integers.</p>
+
+<p>A triplet of indices <code>(i, j, k)</code> is a <strong>mountain</strong> if:</p>
+
+<ul>
+	<li><code>i &lt; j &lt; k</code></li>
+	<li><code>nums[i] &lt; nums[j]</code> and <code>nums[k] &lt; nums[j]</code></li>
+</ul>
+
+<p>Return <em>the <strong>minimum possible sum</strong> of a mountain triplet of</em> <code>nums</code>. <em>If no such triplet exists, return</em> <code>-1</code>.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> nums = [8,6,1,5,3]
+<strong>Output:</strong> 9
+<strong>Explanation:</strong> Triplet (2, 3, 4) is a mountain triplet of sum 9 since: 
+- 2 &lt; 3 &lt; 4
+- nums[2] &lt; nums[3] and nums[4] &lt; nums[3]
+And the sum of this triplet is nums[2] + nums[3] + nums[4] = 9. It can be shown that there are no mountain triplets with a sum of less than 9.
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> nums = [5,4,8,7,10,2]
+<strong>Output:</strong> 13
+<strong>Explanation:</strong> Triplet (1, 3, 5) is a mountain triplet of sum 13 since: 
+- 1 &lt; 3 &lt; 5
+- nums[1] &lt; nums[3] and nums[5] &lt; nums[3]
+And the sum of this triplet is nums[1] + nums[3] + nums[5] = 13. It can be shown that there are no mountain triplets with a sum of less than 13.
+</pre>
+
+<p><strong class="example">Example 3:</strong></p>
+
+<pre>
+<strong>Input:</strong> nums = [6,5,4,3,4,5]
+<strong>Output:</strong> -1
+<strong>Explanation:</strong> It can be shown that there are no mountain triplets in nums.
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>3 &lt;= nums.length &lt;= 50</code></li>
+	<li><code>1 &lt;= nums[i] &lt;= 50</code></li>
+</ul>
+
+## Solutions
+
+<!-- tabs:start -->
+
+### **Python3**
+
+```python
+
+```
+
+### **Java**
+
+```java
+
+```
+
+### **C++**
+
+```cpp
+
+```
+
+### **Go**
+
+```go
+
+```
+
+### **...**
+
+```
+
+```
+
+<!-- tabs:end -->

solution/2900-2999/2909.Minimum Sum of Mountain Triplets II/README.md

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+# [2909. 元素和最小的山形三元组 II](https://leetcode.cn/problems/minimum-sum-of-mountain-triplets-ii)
+
+[English Version](/solution/2900-2999/2909.Minimum%20Sum%20of%20Mountain%20Triplets%20II/README_EN.md)
+
+## 题目描述
+
+<!-- 这里写题目描述 -->
+
+<p>给你一个下标从 <strong>0</strong> 开始的整数数组 <code>nums</code> 。</p>
+
+<p>如果下标三元组 <code>(i, j, k)</code> 满足下述全部条件，则认为它是一个 <strong>山形三元组</strong> ：</p>
+
+<ul>
+	<li><code>i &lt; j &lt; k</code></li>
+	<li><code>nums[i] &lt; nums[j]</code> 且 <code>nums[k] &lt; nums[j]</code></li>
+</ul>
+
+<p>请你找出 <code>nums</code> 中 <strong>元素和最小</strong> 的山形三元组，并返回其 <strong>元素和</strong> 。如果不存在满足条件的三元组，返回 <code>-1</code> 。</p>
+
+<p>&nbsp;</p>
+
+<p><strong class="example">示例 1：</strong></p>
+
+<pre>
+<strong>输入：</strong>nums = [8,6,1,5,3]
+<strong>输出：</strong>9
+<strong>解释：</strong>三元组 (2, 3, 4) 是一个元素和等于 9 的山形三元组，因为： 
+- 2 &lt; 3 &lt; 4
+- nums[2] &lt; nums[3] 且 nums[4] &lt; nums[3]
+这个三元组的元素和等于 nums[2] + nums[3] + nums[4] = 9 。可以证明不存在元素和小于 9 的山形三元组。
+</pre>
+
+<p><strong class="example">示例 2：</strong></p>
+
+<pre>
+<strong>输入：</strong>nums = [5,4,8,7,10,2]
+<strong>输出：</strong>13
+<strong>解释：</strong>三元组 (1, 3, 5) 是一个元素和等于 13 的山形三元组，因为： 
+- 1 &lt; 3 &lt; 5 
+- nums[1] &lt; nums[3] 且 nums[5] &lt; nums[3]
+这个三元组的元素和等于 nums[1] + nums[3] + nums[5] = 13 。可以证明不存在元素和小于 13 的山形三元组。
+</pre>
+
+<p><strong class="example">示例 3：</strong></p>
+
+<pre>
+<strong>输入：</strong>nums = [6,5,4,3,4,5]
+<strong>输出：</strong>-1
+<strong>解释：</strong>可以证明 nums 中不存在山形三元组。
+</pre>
+
+<p>&nbsp;</p>
+
+<p><strong>提示：</strong></p>
+
+<ul>
+	<li><code>3 &lt;= nums.length &lt;= 10<sup>5</sup></code></li>
+	<li><code>1 &lt;= nums[i] &lt;= 10<sup>8</sup></code></li>
+</ul>
+
+## 解法
+
+<!-- 这里可写通用的实现逻辑 -->
+
+<!-- tabs:start -->
+
+### **Python3**
+
+<!-- 这里可写当前语言的特殊实现逻辑 -->
+
+```python
+
+```
+
+### **Java**
+
+<!-- 这里可写当前语言的特殊实现逻辑 -->
+
+```java
+
+```
+
+### **C++**
+
+```cpp
+
+```
+
+### **Go**
+
+```go
+
+```
+
+### **...**
+
+```
+
+```
+
+<!-- tabs:end -->

solution/2900-2999/2909.Minimum Sum of Mountain Triplets II/README_EN.md

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+# [2909. Minimum Sum of Mountain Triplets II](https://leetcode.com/problems/minimum-sum-of-mountain-triplets-ii)
+
+[中文文档](/solution/2900-2999/2909.Minimum%20Sum%20of%20Mountain%20Triplets%20II/README.md)
+
+## Description
+
+<p>You are given a <strong>0-indexed</strong> array <code>nums</code> of integers.</p>
+
+<p>A triplet of indices <code>(i, j, k)</code> is a <strong>mountain</strong> if:</p>
+
+<ul>
+	<li><code>i &lt; j &lt; k</code></li>
+	<li><code>nums[i] &lt; nums[j]</code> and <code>nums[k] &lt; nums[j]</code></li>
+</ul>
+
+<p>Return <em>the <strong>minimum possible sum</strong> of a mountain triplet of</em> <code>nums</code>. <em>If no such triplet exists, return</em> <code>-1</code>.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> nums = [8,6,1,5,3]
+<strong>Output:</strong> 9
+<strong>Explanation:</strong> Triplet (2, 3, 4) is a mountain triplet of sum 9 since: 
+- 2 &lt; 3 &lt; 4
+- nums[2] &lt; nums[3] and nums[4] &lt; nums[3]
+And the sum of this triplet is nums[2] + nums[3] + nums[4] = 9. It can be shown that there are no mountain triplets with a sum of less than 9.
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> nums = [5,4,8,7,10,2]
+<strong>Output:</strong> 13
+<strong>Explanation:</strong> Triplet (1, 3, 5) is a mountain triplet of sum 13 since: 
+- 1 &lt; 3 &lt; 5
+- nums[1] &lt; nums[3] and nums[5] &lt; nums[3]
+And the sum of this triplet is nums[1] + nums[3] + nums[5] = 13. It can be shown that there are no mountain triplets with a sum of less than 13.
+</pre>
+
+<p><strong class="example">Example 3:</strong></p>
+
+<pre>
+<strong>Input:</strong> nums = [6,5,4,3,4,5]
+<strong>Output:</strong> -1
+<strong>Explanation:</strong> It can be shown that there are no mountain triplets in nums.
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>3 &lt;= nums.length &lt;= 10<sup>5</sup></code></li>
+	<li><code>1 &lt;= nums[i] &lt;= 10<sup>8</sup></code></li>
+</ul>
+
+## Solutions
+
+<!-- tabs:start -->
+
+### **Python3**
+
+```python
+
+```
+
+### **Java**
+
+```java
+
+```
+
+### **C++**
+
+```cpp
+
+```
+
+### **Go**
+
+```go
+
+```
+
+### **...**
+
+```
+
+```
+
+<!-- tabs:end -->