diff --git a/mean71/python.ipynb b/mean71/python.ipynb
index 44859eb..3df766b 100644
--- a/mean71/python.ipynb
+++ b/mean71/python.ipynb
@@ -469,6 +469,97 @@
     "\n",
     "# 방탈출 https://www.acmicpc.net/problem/23352 g5\n"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# 9주차"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import sys\n",
+    "import heapq\n",
+    "\n",
+    "he = [1,2,5,4,7]\n",
+    "heapq.heapify(he)\n",
+    "heapq.heappop(he)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# 평행선 https://www.acmicpc.net/problem/2358 s4\n",
+    "import sys\n",
+    "from collections import defaultdict\n",
+    "input = sys.stdin.readline\n",
+    "\n",
+    "x = defaultdict(int)\n",
+    "y = defaultdict(int)\n",
+    "cnt = 0\n",
+    "\n",
+    "for _ in range(int(input())): # 1 <= n <= 10^5\n",
+    "    i, j = map(int, input().split()) # |x|,|y| < 2^31\n",
+    "    x[i] += 1\n",
+    "    y[j] += 1\n",
+    "\n",
+    "for i in x.values():\n",
+    "    if i > 1:\n",
+    "        cnt += 1\n",
+    "\n",
+    "for i in y.values():\n",
+    "    if i > 1:\n",
+    "        cnt += 1\n",
+    "\n",
+    "print(cnt)\n",
+    "\n",
+    "# 밥 https://www.acmicpc.net/problem/23559 g5\n",
+    "# 1 <= N <= 10^5, 1000N <= X <= 5000N\n",
+    "# 1 <= A,B <= 1000\n",
+    "import sys\n",
+    "import heapq\n",
+    "input = sys.stdin.readline\n",
+    "\n",
+    "N, X = map(int, input().split())\n",
+    "max_A = (X - 1000*N)//4000\n",
+    "total = 0\n",
+    "l_A = []\n",
+    "\n",
+    "\n",
+    "for _ in range(N):\n",
+    "    A, B = map(int, input().split())\n",
+    "    total += B\n",
+    "    if A > B:\n",
+    "        heapq.heappush(l_A, B - A)\n",
+    "\n",
+    "if len(l_A) <= max_A:\n",
+    "    total -= sum(l_A)\n",
+    "else:\n",
+    "    for _ in range(max_A):\n",
+    "        total -= heapq.heappop(l_A)\n",
+    "\n",
+    "print(total)\n",
+    "\n",
+    "# 에너그램 https://www.acmicpc.net/problem/6443 g5\n",
+    "# 미해결 출력초과\n",
+    "import sys\n",
+    "from itertools import permutations\n",
+    "input = sys.stdin.readline\n",
+    "\n",
+    "for _ in range(int(input())): # n <= 10^5\n",
+    "    word = input() # 1 <= len(word) <= 20\n",
+    "    \n",
+    "    for s in sorted(set(permutations(word))):\n",
+    "        print(\"\".join(s))"
+   ]
   }
  ],
  "metadata": {
@@ -487,7 +578,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.13.1"
+   "version": "3.11.8"
   }
  },
  "nbformat": 4,