10866_덱.ipynb

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    "import sys\n",
    "\n",
    "class Deque():\n",
    "    def __init__(self):\n",
    "        self.li = []\n",
    "    \n",
    "    def push_front(self, n):\n",
    "        self.li.insert(0, n)\n",
    "\n",
    "    def push_back(self, n):\n",
    "        self.li.append(n)\n",
    "\n",
    "    def pop_front(self):\n",
    "        print(self.li.pop(0) if self.li else -1)\n",
    "    \n",
    "    def pop_back(self):\n",
    "        print(self.li.pop() if self.li else -1)\n",
    "    \n",
    "    def size(self):\n",
    "        print(len(self.li))\n",
    "\n",
    "    def empty(self):\n",
    "        print(0 if self.li else 1)\n",
    "        \n",
    "    def front(self):\n",
    "        print(self.li[0] if self.li else -1)\n",
    "        \n",
    "    def back(self):\n",
    "        print(self.li[-1] if self.li else -1)\n",
    "\n",
    "deque = Deque()\n",
    "for _ in range(int(sys.stdin.readline())):\n",
    "    s = sys.stdin.readline().split()\n",
    "    if s[0] == \"push_front\":\n",
    "        deque.push_front(int(s[1]))\n",
    "    elif s[0] == \"push_back\":\n",
    "        deque.push_back(int(s[1]))\n",
    "    elif s[0] == \"pop_front\":\n",
    "        deque.pop_front()\n",
    "    elif s[0] == \"pop_back\":\n",
    "        deque.pop_back()\n",
    "    elif s[0] == \"size\":\n",
    "        deque.size()\n",
    "    elif s[0] == \"empty\":\n",
    "        deque.empty()\n",
    "    elif s[0] == \"front\":\n",
    "        deque.front()\n",
    "    elif s[0] == \"back\":\n",
    "        deque.back()"
   ]
  },
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   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
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     "end_time": "2021-03-05T09:28:25.173439Z",
     "start_time": "2021-03-05T09:27:36.255278Z"
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   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "15\n",
      "push_back 1\n",
      "push_front 2\n",
      "front\n",
      "2\n",
      "back\n",
      "1\n",
      "size\n",
      "2\n",
      "empty\n",
      "0\n",
      "pop_front\n",
      "2\n",
      "pop_back\n",
      "1\n",
      "pop_front\n",
      "-1\n",
      "size\n",
      "0\n",
      "empty\n",
      "1\n",
      "pop_back\n",
      "-1\n",
      "push_front 3\n",
      "empty\n",
      "0\n",
      "front\n",
      "3\n"
     ]
    }
   ],
   "source": [
    "class Deque():\n",
    "    def __init__(self):\n",
    "        self.li = []\n",
    "    \n",
    "    def push_front(self, n):\n",
    "        self.li.insert(0, n)\n",
    "\n",
    "    def push_back(self, n):\n",
    "        self.li.append(n)\n",
    "\n",
    "    def pop_front(self):\n",
    "        print(self.li.pop(0) if self.li else -1)\n",
    "    \n",
    "    def pop_back(self):\n",
    "        print(self.li.pop() if self.li else -1)\n",
    "    \n",
    "    def size(self):\n",
    "        print(len(self.li))\n",
    "\n",
    "    def empty(self):\n",
    "        print(0 if self.li else 1)\n",
    "        \n",
    "    def front(self):\n",
    "        print(self.li[0] if self.li else -1)\n",
    "        \n",
    "    def back(self):\n",
    "        print(self.li[-1] if self.li else -1)\n",
    "\n",
    "deque = Deque()\n",
    "for _ in range(int(input())):\n",
    "    s = input().split()\n",
    "    if s[0] == \"push_front\":\n",
    "        deque.push_front(int(s[1]))\n",
    "    elif s[0] == \"push_back\":\n",
    "        deque.push_back(int(s[1]))\n",
    "    elif s[0] == \"pop_front\":\n",
    "        deque.pop_front()\n",
    "    elif s[0] == \"pop_back\":\n",
    "        deque.pop_back()\n",
    "    elif s[0] == \"size\":\n",
    "        deque.size()\n",
    "    elif s[0] == \"empty\":\n",
    "        deque.empty()\n",
    "    elif s[0] == \"front\":\n",
    "        deque.front()\n",
    "    elif s[0] == \"back\":\n",
    "        deque.back()"
   ]
  },
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   "cell_type": "code",
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