diff --git a/problems/0242.有效的字母异位词.md b/problems/0242.有效的字母异位词.md
index 463a793f..be553c5a 100644
--- a/problems/0242.有效的字母异位词.md
+++ b/problems/0242.有效的字母异位词.md
@@ -92,16 +92,26 @@ Python：
 
 Go：
 ```go
-func removeElement(nums []int, val int) int {
-    length:=len(nums)
-    res:=0
-    for i:=0;i<length;i++{
-        if nums[i]!=val {
-            nums[res]=nums[i]
-            res++
+func isAnagram(s string, t string) bool {
+    if len(s)!=len(t){
+        return false
+    }
+    exists := make(map[byte]int)
+    for i:=0;i<len(s);i++{
+        if v,ok:=exists[s[i]];v>=0&&ok{
+            exists[s[i]]=v+1
+        }else{
+            exists[s[i]]=1
         }
     }
-    return res
+    for i:=0;i<len(t);i++{
+        if v,ok:=exists[t[i]];v>=1&&ok{
+            exists[t[i]]=v-1
+        }else{
+            return false
+        }
+    }
+    return true
 }
 ```