* fix small Putflag bug

Author: White4Shadow

checker/src/checker.py

@@ -351,7 +351,12 @@ async def putflag_note(
 
     retry = 0
 
-    while username == col_username and retry < 2:
+    def username_normalform(username):
+        letters = sorted([c for c in username if c.isalpha()])
+        digits = sorted([c for c in username if c.isdigit()])
+        return ''.join(letters) + ''.join(digits)
+
+    while username_normalform(username) == username_normalform(col_username) and retry < 3:
         username = rand_str(12)
         col_username = build_collision(username, alphabet=ALPHABET)
         retry += 1