feat: add solutions to lc problem: No.3307

yanglbme · yanglbme · commit 3c6d7e5966ec · 2025-07-04T06:24:33.000+08:00
No.3307.Find the K-th Character in String Game II
diff --git a/solution/3300-3399/3307.Find the K-th Character in String Game II/README.md b/solution/3300-3399/3307.Find the K-th Character in String Game II/README.md
@@ -251,6 +251,61 @@ impl Solution {
 }
 ```
 
+#### C#
+
+```cs
+public class Solution {
+    public char KthCharacter(long k, int[] operations) {
+        long n = 1;
+        int i = 0;
+        while (n < k) {
+            n *= 2;
+            ++i;
+        }
+        int d = 0;
+        while (n > 1) {
+            if (k > n / 2) {
+                k -= n / 2;
+                d += operations[i - 1];
+            }
+            n /= 2;
+            --i;
+        }
+        return (char)('a' + (d % 26));
+    }
+}
+```
+
+#### PHP
+
+```php
+class Solution {
+    /**
+     * @param Integer $k
+     * @param Integer[] $operations
+     * @return String
+     */
+    function kthCharacter($k, $operations) {
+        $n = 1;
+        $i = 0;
+        while ($n < $k) {
+            $n *= 2;
+            ++$i;
+        }
+        $d = 0;
+        while ($n > 1) {
+            if ($k > $n / 2) {
+                $k -= $n / 2;
+                $d += $operations[$i - 1];
+            }
+            $n /= 2;
+            --$i;
+        }
+        return chr(ord('a') + ($d % 26));
+    }
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->
diff --git a/solution/3300-3399/3307.Find the K-th Character in String Game II/README_EN.md b/solution/3300-3399/3307.Find the K-th Character in String Game II/README_EN.md
@@ -248,6 +248,61 @@ impl Solution {
 }
 ```
 
+#### C#
+
+```cs
+public class Solution {
+    public char KthCharacter(long k, int[] operations) {
+        long n = 1;
+        int i = 0;
+        while (n < k) {
+            n *= 2;
+            ++i;
+        }
+        int d = 0;
+        while (n > 1) {
+            if (k > n / 2) {
+                k -= n / 2;
+                d += operations[i - 1];
+            }
+            n /= 2;
+            --i;
+        }
+        return (char)('a' + (d % 26));
+    }
+}
+```
+
+#### PHP
+
+```php
+class Solution {
+    /**
+     * @param Integer $k
+     * @param Integer[] $operations
+     * @return String
+     */
+    function kthCharacter($k, $operations) {
+        $n = 1;
+        $i = 0;
+        while ($n < $k) {
+            $n *= 2;
+            ++$i;
+        }
+        $d = 0;
+        while ($n > 1) {
+            if ($k > $n / 2) {
+                $k -= $n / 2;
+                $d += $operations[$i - 1];
+            }
+            $n /= 2;
+            --$i;
+        }
+        return chr(ord('a') + ($d % 26));
+    }
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->
diff --git a/solution/3300-3399/3307.Find the K-th Character in String Game II/Solution.cs b/solution/3300-3399/3307.Find the K-th Character in String Game II/Solution.cs
@@ -0,0 +1,20 @@
+public class Solution {
+    public char KthCharacter(long k, int[] operations) {
+        long n = 1;
+        int i = 0;
+        while (n < k) {
+            n *= 2;
+            ++i;
+        }
+        int d = 0;
+        while (n > 1) {
+            if (k > n / 2) {
+                k -= n / 2;
+                d += operations[i - 1];
+            }
+            n /= 2;
+            --i;
+        }
+        return (char)('a' + (d % 26));
+    }
+}
diff --git a/solution/3300-3399/3307.Find the K-th Character in String Game II/Solution.php b/solution/3300-3399/3307.Find the K-th Character in String Game II/Solution.php
@@ -0,0 +1,25 @@
+class Solution {
+    /**
+     * @param Integer $k
+     * @param Integer[] $operations
+     * @return String
+     */
+    function kthCharacter($k, $operations) {
+        $n = 1;
+        $i = 0;
+        while ($n < $k) {
+            $n *= 2;
+            ++$i;
+        }
+        $d = 0;
+        while ($n > 1) {
+            if ($k > $n / 2) {
+                $k -= $n / 2;
+                $d += $operations[$i - 1];
+            }
+            $n /= 2;
+            --$i;
+        }
+        return chr(ord('a') + ($d % 26));
+    }
+}
diff --git a/solution/3600-3699/3601.Find Drivers with Improved Fuel Efficiency/README.md b/solution/3600-3699/3601.Find Drivers with Improved Fuel Efficiency/README.md
@@ -8,15 +8,15 @@ tags:
 
 <!-- problem:start -->
 
-# [3601. Find Drivers with Improved Fuel Efficiency](https://leetcode.cn/problems/find-drivers-with-improved-fuel-efficiency)
+# [3601. 寻找燃油效率提升的驾驶员](https://leetcode.cn/problems/find-drivers-with-improved-fuel-efficiency)
 
 [English Version](/solution/3600-3699/3601.Find%20Drivers%20with%20Improved%20Fuel%20Efficiency/README_EN.md)
 
 ## 题目描述
 
 <!-- description:start -->
 
-<p>Table: <code>drivers</code></p>
+<p>表：<code>drivers</code></p>
 
 <pre>
 +-------------+---------+
@@ -25,11 +25,11 @@ tags:
 | driver_id   | int     |
 | driver_name | varchar |
 +-------------+---------+
-driver_id is the unique identifier for this table.
-Each row contains information about a driver.
+driver_id 是这张表的唯一主键。
+每一行都包含一个司机的信息。
 </pre>
 
-<p>Table: <code>trips</code></p>
+<p>表：<code>trips</code></p>
 
 <pre>
 +---------------+---------+
@@ -41,31 +41,32 @@ Each row contains information about a driver.
 | distance_km   | decimal |
 | fuel_consumed | decimal |
 +---------------+---------+
-trip_id is the unique identifier for this table.
-Each row represents a trip made by a driver, including the distance traveled and fuel consumed for that trip.
+trip_id 是这张表的唯一主键。
+每一行表示一名司机完成的一次行程，包括该次行程行驶的距离和消耗的燃油量。
 </pre>
 
-<p>Write a solution to find drivers whose <strong>fuel efficiency has improved</strong> by <strong>comparing</strong> their average fuel efficiency in the<strong> first half</strong> of the year with the <strong>second half</strong> of the year.</p>
+<p>编写一个解决方案，通过 <strong>比较</strong> 司机在 <strong>上半年</strong> 和 <strong>下半年</strong> 的 <strong>平均燃油效率</strong> 来找出 <strong>燃油效率有所提高</strong> 的司机。</p>
 
 <ul>
-	<li>Calculate <strong>fuel efficiency</strong> as <code>distance_km / fuel_consumed</code> for <strong>each</strong> trip</li>
-	<li><strong>First half</strong>: January to June, <strong>Second half</strong>: July to December</li>
-	<li>Only include drivers who have trips in <strong>both halves</strong> of the year</li>
-	<li>Calculate the <strong>efficiency improvement</strong> as (<code>second_half_avg - first_half_avg</code>)</li>
-	<li><strong>Round </strong>all<strong> </strong>results<strong> </strong>to<strong> <code>2</code> </strong>decimal<strong> </strong>places</li>
+	<li>通过&nbsp;<code>distance_km / fuel_consumed</code>&nbsp;计算 <strong>每次</strong>&nbsp;行程的 <strong>燃油效率</strong>。</li>
+	<li><strong>上半年：</strong>一月到六月，<strong>下半年：</strong>七月到十二月</li>
+	<li>只包含在上半年和下半年都有行程的司机</li>
+	<li>通过（<code>second_half_avg - first_half_avg</code>）计算 <strong>提升效率</strong>。</li>
+	<li>将所有结果 <strong>四舍五入</strong> 到小数点后 <code>2</code>&nbsp;位</li>
 </ul>
 
-<p>Return <em>the result table ordered by efficiency improvement in <strong>descending</strong> order, then by driver name in <strong>ascending</strong> order</em>.</p>
+<p>返回结果表按提升效率&nbsp;<strong>降序</strong> 排列，然后按司机姓名 <strong>升序</strong> 排列。</p>
 
-<p>The result format is in the following example.</p>
+<p>结果格式如下所示。</p>
 
 <p>&nbsp;</p>
-<p><strong class="example">Example:</strong></p>
+
+<p><strong class="example">示例：</strong></p>
 
 <div class="example-block">
-<p><strong>Input:</strong></p>
+<p><strong>输入：</strong></p>
 
-<p>drivers table:</p>
+<p>drivers 表：</p>
 
 <pre class="example-io">
 +-----------+---------------+
@@ -79,7 +80,7 @@ Each row represents a trip made by a driver, including the distance traveled and
 +-----------+---------------+
 </pre>
 
-<p>trips table:</p>
+<p>trips 表：</p>
 
 <pre class="example-io">
 +---------+-----------+------------+-------------+---------------+
@@ -100,7 +101,7 @@ Each row represents a trip made by a driver, including the distance traveled and
 +---------+-----------+------------+-------------+---------------+
 </pre>
 
-<p><strong>Output:</strong></p>
+<p><strong>输出：</strong></p>
 
 <pre class="example-io">
 +-----------+---------------+------------------+-------------------+------------------------+
@@ -111,39 +112,39 @@ Each row represents a trip made by a driver, including the distance traveled and
 +-----------+---------------+------------------+-------------------+------------------------+
 </pre>
 
-<p><strong>Explanation:</strong></p>
+<p><strong>解释：</strong></p>
 
 <ul>
 	<li><strong>Alice Johnson (driver_id = 1):</strong>
 
     <ul>
-    	<li>First half trips (Jan-Jun): Feb 15 (120.5/10.2 = 11.81), Mar 20 (200.0/16.5 = 12.12)</li>
-    	<li>First half average efficiency: (11.81 + 12.12) / 2 = 11.97</li>
-    	<li>Second half trips (Jul-Dec): Aug 10 (150.0/11.0 = 13.64), Sep 25 (180.0/12.5 = 14.40)</li>
-    	<li>Second half average efficiency: (13.64 + 14.40) / 2 = 14.02</li>
-    	<li>Efficiency improvement: 14.02 - 11.97 = 2.05</li>
+    	<li>上半年行程（一月到六月）：Feb 15 (120.5/10.2 = 11.81), Mar 20 (200.0/16.5 = 12.12)</li>
+    	<li>上半年平均效率：(11.81 + 12.12) / 2 = 11.97</li>
+    	<li>下半年行程（七月到十二月）：Aug 10 (150.0/11.0 = 13.64), Sep 25 (180.0/12.5 = 14.40)</li>
+    	<li>下半年平均效率：(13.64 + 14.40) / 2 = 14.02</li>
+    	<li>效率提升：14.02 - 11.97 = 2.05</li>
     </ul>
     </li>
     <li><strong>Bob Smith (driver_id = 2):</strong>
     <ul>
-    	<li>First half trips: Jan 10 (100.0/9.0 = 11.11), Apr 15 (250.0/22.0 = 11.36)</li>
-    	<li>First half average efficiency: (11.11 + 11.36) / 2 = 11.24</li>
-    	<li>Second half trips: Oct 5 (200.0/15.0 = 13.33)</li>
-    	<li>Second half average efficiency: 13.33</li>
-    	<li>Efficiency improvement: 13.33 - 11.24 = 2.09</li>
+    	<li>上半年行程：Jan 10 (100.0/9.0 = 11.11), Apr 15 (250.0/22.0 = 11.36)</li>
+    	<li>上半年平均效率：(11.11 + 11.36) / 2 = 11.24</li>
+    	<li>下半年行程：Oct 5 (200.0/15.0 = 13.33)</li>
+    	<li>下半年平均效率：13.33</li>
+    	<li>效率提升：13.33 - 11.24 = 2.09</li>
     </ul>
     </li>
-    <li><strong>Drivers not included:</strong>
+    <li><strong>未包含的司机：</strong>
     <ul>
-    	<li>Carol Davis (driver_id = 3): Only has trips in first half (Mar, May)</li>
-    	<li>David Wilson (driver_id = 4): Only has trips in second half (Jul, Nov)</li>
-    	<li>Emma Brown (driver_id = 5): Only has trips in first half (Feb)</li>
+    	<li>Carol Davis (driver_id = 3)：只有上半年的行程（三月，五月）</li>
+    	<li>David Wilson (driver_id = 4)：只有下半年的行程（七月，十一月）</li>
+    	<li>Emma Brown (driver_id = 5)：只有上半年的行程（二月）</li>
     </ul>
     </li>
 
 </ul>
 
-<p>The output table is ordered by efficiency improvement in descending order then by name in ascending order.</p>
+<p>输出表按提升效率降序排列，然后按司机名字升序排列。</p>
 </div>
 
 <!-- description:end -->
diff --git a/solution/DATABASE_README.md b/solution/DATABASE_README.md
@@ -320,7 +320,7 @@
 | 3570 | [查找无可用副本的书籍](/solution/3500-3599/3570.Find%20Books%20with%20No%20Available%20Copies/README.md)                                                     | `数据库` | 简单 |      |
 | 3580 | [寻找持续进步的员工](/solution/3500-3599/3580.Find%20Consistently%20Improving%20Employees/README.md)                                                         | `数据库` | 中等 |      |
 | 3586 | [寻找 COVID 康复患者](/solution/3500-3599/3586.Find%20COVID%20Recovery%20Patients/README.md)                                                                 | `数据库` | 中等 |      |
-| 3601 | [Find Drivers with Improved Fuel Efficiency](/solution/3600-3699/3601.Find%20Drivers%20with%20Improved%20Fuel%20Efficiency/README.md)                        |          | 中等 |      |
+| 3601 | [寻找燃油效率提升的驾驶员](/solution/3600-3699/3601.Find%20Drivers%20with%20Improved%20Fuel%20Efficiency/README.md)                                          |          | 中等 |      |
 
 ## 版权
 
diff --git a/solution/README.md b/solution/README.md
@@ -3611,7 +3611,7 @@
 |  3598  |  [相邻字符串之间的最长公共前缀](/solution/3500-3599/3598.Longest%20Common%20Prefix%20Between%20Adjacent%20Strings%20After%20Removals/README.md)  |  `数组`,`字符串`  |  中等  |  第 456 场周赛  |
 |  3599  |  [划分数组得到最小 XOR](/solution/3500-3599/3599.Partition%20Array%20to%20Minimize%20XOR/README.md)  |  `位运算`,`数组`,`动态规划`,`前缀和`  |  中等  |  第 456 场周赛  |
 |  3600  |  [升级后最大生成树稳定性](/solution/3600-3699/3600.Maximize%20Spanning%20Tree%20Stability%20with%20Upgrades/README.md)  |  `贪心`,`并查集`,`图`,`二分查找`,`最小生成树`  |  困难  |  第 456 场周赛  |
-|  3601  |  [Find Drivers with Improved Fuel Efficiency](/solution/3600-3699/3601.Find%20Drivers%20with%20Improved%20Fuel%20Efficiency/README.md)  |    |  中等  |    |
+|  3601  |  [寻找燃油效率提升的驾驶员](/solution/3600-3699/3601.Find%20Drivers%20with%20Improved%20Fuel%20Efficiency/README.md)  |    |  中等  |    |
 
 ## 版权
 
