diff --git "a/leetcode3/\354\227\274\355\230\234\354\240\225/242. Valid Anagram.java" "b/leetcode3/\354\227\274\355\230\234\354\240\225/242. Valid Anagram.java"
new file mode 100644
index 00000000..79d92523
--- /dev/null
+++ "b/leetcode3/\354\227\274\355\230\234\354\240\225/242. Valid Anagram.java"	
@@ -0,0 +1,20 @@
+// o(n)
+
+class Solution {
+    public boolean isAnagram(String s, String t) {
+        if (s.length() != t.length()) return false;
+        
+        int[] cnt = new int[26];
+        for (int i = 0; i<s.length(); i++) {
+            int ord = (int) s.charAt(i) - 97;
+            cnt[ord]++;
+        }
+
+        for (int i = 0; i<t.length(); i++) {
+            int ord = (int) t.charAt(i) - 97;
+            if (cnt[ord] == 0) return false;
+            cnt[ord]--;
+        }
+        return true;
+    }
+}