first commit

from old repository to a new repository

boj/11723.py

@@ -0,0 +1,28 @@
+import sys
+n=int(sys.stdin.readline().rstrip())
+arr=set()
+
+for _ in range(n):
+    com=sys.stdin.readline().rstrip().split()
+
+    if len(com)==1:
+        if com[0]=="all":
+            arr=set([i for i in range(1,21)])
+        else:
+            arr.clear()
+    else:
+        num=int(com[1])
+        if com[0]=="add":
+            arr.add(num)
+        elif com[0]=="remove":
+            arr.discard(num)
+        elif com[0]=="check":
+            if num in arr:
+                print(1)
+            else:
+                print(0)
+        elif com[0]=="toggle":
+            if num in arr:
+                arr.discard(num)
+            else:
+                arr.add(num)