fix round 1

env/attacker.py

@@ -94,8 +94,16 @@ def directory_traversal():
 
 
 def simulate_attack():
-    brute_force()
-    port_scan()
-    credential_stuffing()
-    sql_injection()
-    directory_traversal()
+
+    attacks = [
+        brute_force,
+        port_scan,
+        credential_stuffing,
+        sql_injection,
+        directory_traversal
+    ]
+
+    selected = random.sample(attacks, k=3)
+
+    for attack in selected:
+        attack()

tasks/easy/grader.py

@@ -1,3 +1,5 @@
 def grade(rewards):
+    if not rewards:
+        return 0.0
     score = sum(rewards) / len(rewards)
     return min(max(score, 0.0), 1.0)

tasks/hard/grader.py

@@ -1,4 +1,7 @@
 def grade(rewards):
+    if not rewards:
+        return 0.0
+
     score = sum(rewards) / len(rewards)
     score = score * 0.8
     return min(max(score, 0.0), 1.0)

tasks/medium/grader.py

@@ -1,4 +1,7 @@
 def grade(rewards):
+    if not rewards:
+        return 0.0
+
     score = sum(rewards) / len(rewards)
     score = score * 0.9
     return min(max(score, 0.0), 1.0)