From 2a129aea3b4986fd91cc12d7c872f2bfdab09164 Mon Sep 17 00:00:00 2001
From: xxubin04 <yubinjeong40@gmail.com>
Date: Wed, 8 Nov 2023 21:16:27 +0900
Subject: [PATCH 1/2] =?UTF-8?q?2023-11-08=20=EC=8A=A4=ED=83=9D=202?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 xxubin04/README.md                            |  2 +-
 .../\352\265\254\355\230\204/28278_stack2.py" | 33 +++++++++++++++++++
 2 files changed, 34 insertions(+), 1 deletion(-)
 create mode 100644 "xxubin04/\352\265\254\355\230\204/28278_stack2.py"

diff --git a/xxubin04/README.md b/xxubin04/README.md
index 8134ba4..6dbf5cf 100644
--- a/xxubin04/README.md
+++ b/xxubin04/README.md
@@ -2,5 +2,5 @@
 
 | 차시 |    날짜    | 문제유형 | 링크 | 풀이 |
 |:----:|:---------:|:----:|:-----:|:----:|
-| 1차시 | 2023.10.27 |  BFS  | -  | - |
+| 1차시 | 2023.11.08 |  스택  | <a href="https://www.acmicpc.net/problem/28278">스택 2</a>  | https://github.com/AlgoLeadMe/AlgoLeadMe-3 |
 ---
diff --git "a/xxubin04/\352\265\254\355\230\204/28278_stack2.py" "b/xxubin04/\352\265\254\355\230\204/28278_stack2.py"
new file mode 100644
index 0000000..8c72dc4
--- /dev/null
+++ "b/xxubin04/\352\265\254\355\230\204/28278_stack2.py"
@@ -0,0 +1,33 @@
+import sys
+
+n = int(sys.stdin.readline())
+stack = []
+
+for i in range(n):
+    num = sys.stdin.readline().split()
+
+    if num[0] == "1":
+        stack.append(num[-1])
+
+    elif num[0] == "2":
+        if len(stack) != 0:
+            print(stack.pop(-1))
+        else:
+            print(-1)
+
+    elif num[0] == "3":
+        print(len(stack))
+
+    elif num[0] == "4":
+        if len(stack) == 0:
+            print(1)
+        else:
+            print(0)
+
+    elif num[0] == "5":
+        if len(stack) != 0:
+            print(stack[-1])
+        else:
+            print(-1)
+    else:
+        break
\ No newline at end of file

From cad068ed029fa7ed49a818bb9c94d33113541829 Mon Sep 17 00:00:00 2001
From: xxubin04 <yubinjeong40@gmail.com>
Date: Wed, 8 Nov 2023 22:11:35 +0900
Subject: [PATCH 2/2] 2023-11-08 readme

---
 xxubin04/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xxubin04/README.md b/xxubin04/README.md
index 6dbf5cf..42145d5 100644
--- a/xxubin04/README.md
+++ b/xxubin04/README.md
@@ -2,5 +2,5 @@
 
 | 차시 |    날짜    | 문제유형 | 링크 | 풀이 |
 |:----:|:---------:|:----:|:-----:|:----:|
-| 1차시 | 2023.11.08 |  스택  | <a href="https://www.acmicpc.net/problem/28278">스택 2</a>  | https://github.com/AlgoLeadMe/AlgoLeadMe-3 |
+| 1차시 | 2023.11.08 |  스택  | <a href="https://www.acmicpc.net/problem/28278">스택 2</a>  | https://github.com/AlgoLeadMe/AlgoLeadMe-3/pull/3 |
 ---