Create leetflex-banned-accounts.sql

Author: kamyu104

MySQL/leetflex-banned-accounts.sql

@@ -0,0 +1,10 @@
+# Time:  O(n^2)
+# Space: O(n)
+
+SELECT DISTINCT l1.account_id
+FROM   loginfo l1
+       INNER JOIN loginfo l2
+               ON l1.account_id = l2.account_id
+                  AND l1.ip_address != l2.ip_address
+WHERE  NOT (l1.login > l2.logout
+            OR l1.logout < l2.login);