diff --git a/src/main/java/leetcode/editor/cn/ValidAnagram.java b/src/main/java/leetcode/editor/cn/ValidAnagram.java
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+++ b/src/main/java/leetcode/editor/cn/ValidAnagram.java
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+//给定两个字符串 s 和 t ，编写一个函数来判断 t 是否是 s 的字母异位词。 
+//
+// 
+//
+// 示例 1: 
+//
+// 
+//输入: s = "anagram", t = "nagaram"
+//输出: true
+// 
+//
+// 示例 2: 
+//
+// 
+//输入: s = "rat", t = "car"
+//输出: false 
+//
+// 
+//
+// 提示: 
+//
+// 
+// 1 <= s.length, t.length <= 5 * 104 
+// s 和 t 仅包含小写字母 
+// 
+//
+// 
+//
+// 进阶: 如果输入字符串包含 unicode 字符怎么办？你能否调整你的解法来应对这种情况？ 
+// Related Topics 哈希表 字符串 排序 
+// 👍 401 👎 0
+
+package leetcode.editor.cn;
+//242:有效的字母异位词
+class ValidAnagram{
+    public static void main(String[] args) {
+        //测试代码
+        Solution solution = new ValidAnagram().new Solution();
+    }
+    //力扣代码
+    //leetcode submit region begin(Prohibit modification and deletion)
+class Solution {
+    public boolean isAnagram(String s, String t) {
+        if(s.length()!=t.length()){
+            return false;
+        }
+        int[] arr = new int[26];
+        for (char ch:s.toCharArray()){
+            arr[ch-'a']++;
+        }
+        for (char ch:t.toCharArray()){
+            if(arr[ch-'a']<1){
+                return false;
+            }
+            arr[ch-'a']--;
+        }
+        return true;
+    }
+}
+//leetcode submit region end(Prohibit modification and deletion)
+
+}
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diff --git a/src/main/java/leetcode/editor/cn/ValidAnagram.md b/src/main/java/leetcode/editor/cn/ValidAnagram.md
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+++ b/src/main/java/leetcode/editor/cn/ValidAnagram.md
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+<p>给定两个字符串 <em>s</em> 和 <em>t</em> ，编写一个函数来判断 <em>t</em> 是否是 <em>s</em> 的字母异位词。</p>
+
+<p> </p>
+
+<p><strong>示例 1:</strong></p>
+
+<pre>
+<strong>输入:</strong> <em>s</em> = "anagram", <em>t</em> = "nagaram"
+<strong>输出:</strong> true
+</pre>
+
+<p><strong>示例 2:</strong></p>
+
+<pre>
+<strong>输入:</strong> <em>s</em> = "rat", <em>t</em> = "car"
+<strong>输出: </strong>false</pre>
+
+<p> </p>
+
+<p><strong>提示:</strong></p>
+
+<ul>
+	<li><code>1 <= s.length, t.length <= 5 * 10<sup>4</sup></code></li>
+	<li><code>s</code> 和 <code>t</code> 仅包含小写字母</li>
+</ul>
+
+<p> </p>
+
+<p><strong>进阶: </strong>如果输入字符串包含 unicode 字符怎么办？你能否调整你的解法来应对这种情况？</p>
+<div><div>Related Topics</div><div><li>哈希表</li><li>字符串</li><li>排序</li></div></div>\n<div><li>👍 401</li><li>👎 0</li></div>
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