更新国外版力扣题目描述变更

leetcode/problem/2-keys-keyboard.html

@@ -1,4 +1,4 @@
-<p>There is only one character <code>&#39;A&#39;</code> on the screen of a notepad. You can perform two operations on this notepad for each step:</p>
+<p>There is only one character <code>&#39;A&#39;</code> on the screen of a notepad. You can perform one of two operations on this notepad for each step:</p>
 
 <ul>
 	<li>Copy All: You can copy all the characters present on the screen (a partial copy is not allowed).</li>
@@ -13,7 +13,7 @@
 <pre>
 <strong>Input:</strong> n = 3
 <strong>Output:</strong> 3
-<strong>Explanation:</strong> Intitally, we have one character &#39;A&#39;.
+<strong>Explanation:</strong> Initially, we have one character &#39;A&#39;.
 In step 1, we use Copy All operation.
 In step 2, we use Paste operation to get &#39;AA&#39;.
 In step 3, we use Paste operation to get &#39;AAA&#39;.

leetcode/problem/3sum-with-multiplicity.html

@@ -27,6 +27,14 @@ We choose one 1 from [1,1] in 2 ways,
 and two 2s from [2,2,2,2] in 6 ways.
 </pre>
 
+<p><strong>Example 3:</strong></p>
+
+<pre>
+<strong>Input:</strong> arr = [2,1,3], target = 6
+<strong>Output:</strong> 1
+<strong>Explanation:</strong> (1, 2, 3) occured one time in the array so we return 1.
+</pre>
+
 <p>&nbsp;</p>
 <p><strong>Constraints:</strong></p>
 

leetcode/problem/avoid-flood-in-the-city.html

@@ -1,4 +1,4 @@
-<p>Your country has an infinite number of lakes. Initially, all the lakes are empty, but when it rains over the <code>nth</code> lake, the <code>nth</code> lake becomes full of water. If it rains over a lake which is <strong>full of water</strong>, there will be a <strong>flood</strong>. Your goal is to avoid the flood in any lake.</p>
+<p>Your country has an infinite number of lakes. Initially, all the lakes are empty, but when it rains over the <code>nth</code> lake, the <code>nth</code> lake becomes full of water. If it rains over a lake that is <strong>full of water</strong>, there will be a <strong>flood</strong>. Your goal is to avoid floods in any lake.</p>
 
 <p>Given an integer array <code>rains</code> where:</p>
 
@@ -17,7 +17,7 @@
 
 <p>If there are multiple valid answers return <strong>any</strong> of them. If it is impossible to avoid flood return <strong>an empty array</strong>.</p>
 
-<p>Notice that if you chose to dry a full lake, it becomes empty, but if you chose to dry an empty lake, nothing changes. (see example 4)</p>
+<p>Notice that if you chose to dry a full lake, it becomes empty, but if you chose to dry an empty lake, nothing changes.</p>
 
 <p>&nbsp;</p>
 <p><strong>Example 1:</strong></p>

leetcode/problem/baseball-game.html

@@ -9,7 +9,7 @@
 	<li><code>&quot;C&quot;</code> - Invalidate the previous score, removing it from the record. It is guaranteed there will always be a previous score.</li>
 </ol>
 
-<p>Return <em>the sum of all the scores on the record</em>.</p>
+<p>Return <em>the sum of all the scores on the record</em>. The test cases are generated so that the answer fits in a 32-bit integer.</p>
 
 <p>&nbsp;</p>
 <p><strong>Example 1:</strong></p>

leetcode/problem/broken-calculator.html

@@ -36,5 +36,5 @@
 <p><strong>Constraints:</strong></p>
 
 <ul>
-	<li><code>1 &lt;= x, y &lt;= 10<sup>9</sup></code></li>
+	<li><code>1 &lt;= startValue, target &lt;= 10<sup>9</sup></code></li>
 </ul>

leetcode/problem/consecutive-numbers.html

@@ -8,6 +8,7 @@
 | num         | varchar |
 +-------------+---------+
 id is the primary key for this table.
+id is an autoincrement column.
 </pre>
 
 <p>&nbsp;</p>

leetcode/problem/count-unique-characters-of-all-substrings-of-a-given-string.html

@@ -15,7 +15,7 @@
 <strong>Input:</strong> s = &quot;ABC&quot;
 <strong>Output:</strong> 10
 <strong>Explanation: </strong>All possible substrings are: &quot;A&quot;,&quot;B&quot;,&quot;C&quot;,&quot;AB&quot;,&quot;BC&quot; and &quot;ABC&quot;.
-Evey substring is composed with only unique letters.
+Every substring is composed with only unique letters.
 Sum of lengths of all substring is 1 + 1 + 1 + 2 + 2 + 3 = 10
 </pre>
 

leetcode/problem/encrypt-and-decrypt-strings.html

@@ -7,6 +7,8 @@
 	<li>Replace <code>c</code> with <code>values[i]</code> in the string.</li>
 </ol>
 
+<p>Note that in case a character of the string is <strong>not present</strong> in <code>keys</code>, the encryption process cannot be carried out, and an empty string <code>&quot;&quot;</code> is returned.</p>
+
 <p>A string is <strong>decrypted</strong> with the following process:</p>
 
 <ol>

leetcode/problem/shuffle-an-array.html

@@ -32,8 +32,8 @@ solution.shuffle();    // Returns the random shuffling of array [1,2,3]. Example
 <p><strong>Constraints:</strong></p>
 
 <ul>
-	<li><code>1 &lt;= nums.length &lt;= 200</code></li>
+	<li><code>1 &lt;= nums.length &lt;= 50</code></li>
 	<li><code>-10<sup>6</sup> &lt;= nums[i] &lt;= 10<sup>6</sup></code></li>
 	<li>All the elements of <code>nums</code> are <strong>unique</strong>.</li>
-	<li>At most <code>5 * 10<sup>4</sup></code> calls <strong>in total</strong> will be made to <code>reset</code> and <code>shuffle</code>.</li>
+	<li>At most <code>10<sup>4</sup></code> calls <strong>in total</strong> will be made to <code>reset</code> and <code>shuffle</code>.</li>
 </ul>

leetcode/problem/unique-paths-ii.html

@@ -1,10 +1,10 @@
-<p>A robot is located at the top-left corner of a <code>m x n</code> grid (marked &#39;Start&#39; in the diagram below).</p>
+<p>You are given an <code>m x n</code> integer array <code>grid</code>. There is a robot initially located at the <b>top-left corner</b> (i.e., <code>grid[0][0]</code>). The robot tries to move to the <strong>bottom-right corner</strong> (i.e., <code>grid[m-1][n-1]</code>). The robot can only move either down or right at any point in time.</p>
 
-<p>The robot can only move either down or right at any point in time. The robot is trying to reach the bottom-right corner of the grid (marked &#39;Finish&#39; in the diagram below).</p>
+<p>An obstacle and space are marked as <code>1</code> or <code>0</code> respectively in <code>grid</code>. A path that the robot takes cannot include <strong>any</strong> square that is an obstacle.</p>
 
-<p>Now consider if some obstacles are added to the grids. How many unique paths would there be?</p>
+<p>Return <em>the number of possible unique paths that the robot can take to reach the bottom-right corner</em>.</p>
 
-<p>An obstacle and space is marked as <code>1</code> and <code>0</code> respectively in the grid.</p>
+<p>The testcases are generated so that the answer will be less than or equal to <code>2 * 10<sup>9</sup></code>.</p>
 
 <p>&nbsp;</p>
 <p><strong>Example 1:</strong></p>
@@ -29,8 +29,8 @@ There are two ways to reach the bottom-right corner:
 <p><strong>Constraints:</strong></p>
 
 <ul>
-	<li><code>m ==&nbsp;obstacleGrid.length</code></li>
-	<li><code>n ==&nbsp;obstacleGrid[i].length</code></li>
+	<li><code>m == obstacleGrid.length</code></li>
+	<li><code>n == obstacleGrid[i].length</code></li>
 	<li><code>1 &lt;= m, n &lt;= 100</code></li>
 	<li><code>obstacleGrid[i][j]</code> is <code>0</code> or <code>1</code>.</li>
 </ul>

leetcode/problem/utf-8-validation.html

@@ -1,6 +1,6 @@
-<p>Given an integer array <code>data</code> representing the data, return whether it is a valid <strong>UTF-8</strong> encoding.</p>
+<p>Given an integer array <code>data</code> representing the data, return whether it is a valid <strong>UTF-8</strong> encoding (i.e. it translates to a sequence of valid UTF-8 encoded characters).</p>
 
-<p>A character in <strong>UTF8</strong> can be from <b>1 to 4 bytes</b> long, subjected to the following rules:</p>
+<p>A character in <strong>UTF8</strong> can be from <strong>1 to 4 bytes</strong> long, subjected to the following rules:</p>
 
 <ol>
 	<li>For a <strong>1-byte</strong> character, the first bit is a <code>0</code>, followed by its Unicode code.</li>
@@ -10,16 +10,18 @@
 <p>This is how the UTF-8 encoding would work:</p>
 
 <pre>
-<code>   Char. number range  |        UTF-8 octet sequence
-      (hexadecimal)    |              (binary)
-   --------------------+---------------------------------------------
-   0000 0000-0000 007F | 0xxxxxxx
-   0000 0080-0000 07FF | 110xxxxx 10xxxxxx
-   0000 0800-0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx
-   0001 0000-0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx</code>
+     Number of Bytes   |        UTF-8 Octet Sequence
+                       |              (binary)
+   --------------------+-----------------------------------------
+            1          |   0xxxxxxx
+            2          |   110xxxxx 10xxxxxx
+            3          |   1110xxxx 10xxxxxx 10xxxxxx
+            4          |   11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
 </pre>
 
-<p><b>Note: </b>The input is an array of integers. Only the <b>least significant 8 bits</b> of each integer is used to store the data. This means each integer represents only 1 byte of data.</p>
+<p><code>x</code> denotes a bit in the binary form of a byte that may be either <code>0</code> or <code>1</code>.</p>
+
+<p><strong>Note: </strong>The input is an array of integers. Only the <strong>least significant 8 bits</strong> of each integer is used to store the data. This means each integer represents only 1 byte of data.</p>
 
 <p>&nbsp;</p>
 <p><strong>Example 1:</strong></p>