chore: update lc problem: No.0258, No.0259, No.0261 (#1400)

Author: thinkasany

solution/0200-0299/0258.Add Digits/README.md

@@ -13,12 +13,12 @@
 <p><strong>示例 1:</strong></p>
 
 <pre>
-<strong>输入:</strong> num =<strong> </strong><code>38</code>
+<strong>输入:</strong> num =<strong> </strong>38
 <strong>输出:</strong> 2 
 <strong>解释: </strong>各位相加的过程为<strong>：
 </strong>38 --&gt; 3 + 8 --&gt; 11
 11 --&gt; 1 + 1 --&gt; 2
-由于&nbsp;<code>2</code> 是一位数，所以返回 2。
+由于&nbsp;2 是一位数，所以返回 2。
 </pre>
 
 <p><strong>示例 2:</strong></p>

solution/0200-0299/0259.3Sum Smaller/README.md

@@ -13,7 +13,7 @@
 <p><strong>示例 1：</strong></p>
 
 <pre>
-<strong>输入: </strong><em>nums</em> = <code>[-2,0,1,3]</code>, <em>target</em> = 2
+<strong>输入: </strong><em>nums</em> = [-2,0,1,3], <em>target</em> = 2
 <strong>输出: </strong>2 
 <strong>解释: </strong>因为一共有两个三元组满足累加和小于 2:
 &nbsp;    [-2,0,1]
@@ -23,13 +23,13 @@
 <p><strong>示例 2：</strong></p>
 
 <pre>
-<strong>输入: </strong><em>nums</em> = <code>[]</code>, <em>target</em> = 0
+<strong>输入: </strong><em>nums</em> = [], <em>target</em> = 0
 <strong>输出: </strong>0 </pre>
 
 <p><strong>示例 3：</strong></p>
 
 <pre>
-<strong>输入: </strong><em>nums</em> = <code>[0]</code>, <em>target</em> = 0
+<strong>输入: </strong><em>nums</em> = [0], <em>target</em> = 0
 <strong>输出: </strong>0 </pre>
 
 <p>&nbsp;</p>

solution/0200-0299/0261.Graph Valid Tree/README.md

@@ -17,15 +17,15 @@
 <p><img src="https://fastly.jsdelivr.net/gh/doocs/leetcode@main/solution/0200-0299/0261.Graph%20Valid%20Tree/images/tree1-graph.jpg" /></p>
 
 <pre>
-<strong>输入:</strong> <code>n = 5</code>, edges<code> = [[0,1],[0,2],[0,3],[1,4]]</code>
+<strong>输入:</strong> n = 5, edges = [[0,1],[0,2],[0,3],[1,4]]
 <strong>输出:</strong> true</pre>
 
 <p><strong>示例 2:</strong></p>
 
 <p><img src="https://fastly.jsdelivr.net/gh/doocs/leetcode@main/solution/0200-0299/0261.Graph%20Valid%20Tree/images/tree2-graph.jpg" /></p>
 
 <pre>
-<strong>输入:</strong> <code>n = 5, </code>edges<code> = [[0,1],[1,2],[2,3],[1,3],[1,4]]</code>
+<strong>输入:</strong> n = 5, edges = [[0,1],[1,2],[2,3],[1,3],[1,4]]
 <strong>输出:</strong> false</pre>
 
 <p>&nbsp;</p>

solution/config.py

@@ -9,6 +9,9 @@
     40,
     115,
     128,
+    258,
+    259,
+    261,
     279,
     280,
     281,