10828_스택.ipynb

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    "ExecuteTime": {
     "end_time": "2021-03-05T04:19:44.794946Z",
     "start_time": "2021-03-05T04:19:44.755410Z"
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   },
   "outputs": [],
   "source": [
    "import sys\n",
    "\n",
    "class Stack():\n",
    "    def __init__(self):\n",
    "        self.li = []\n",
    "    \n",
    "    def push(self, n):\n",
    "        self.li.append(n)\n",
    "        \n",
    "    def pop(self):\n",
    "        print(self.li.pop() if len(self.li) > 0 else -1)\n",
    "    \n",
    "    def size(self):\n",
    "        print(len(self.li))\n",
    "        \n",
    "    def empty(self):\n",
    "        print(1 if len(self.li) == 0 else 0)\n",
    "        \n",
    "    def top(self):\n",
    "        print(self.li[-1] if len(self.li) > 0 else -1)\n",
    "    \n",
    "stack = Stack()\n",
    "for _ in range(int(sys.stdin.readline())):\n",
    "    s = sys.stdin.readline().split()\n",
    "    if s[0] == \"push\":\n",
    "        stack.push(int(s[1]))\n",
    "    elif s[0] == \"pop\":\n",
    "        stack.pop()\n",
    "    elif s[0] == \"size\":\n",
    "        stack.size()\n",
    "    elif s[0] == \"empty\":\n",
    "        stack.empty()\n",
    "    elif s[0] == \"top\":\n",
    "        stack.top()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2021-03-05T04:18:58.934635Z",
     "start_time": "2021-03-05T04:18:17.206591Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "14\n",
      "push 1\n",
      "push 2\n",
      "top\n",
      "2\n",
      "size\n",
      "2\n",
      "empty\n",
      "0\n",
      "pop\n",
      "2\n",
      "pop\n",
      "1\n",
      "pop\n",
      "-1\n",
      "size\n",
      "0\n",
      "empty\n",
      "1\n",
      "pop\n",
      "-1\n",
      "push 3\n",
      "empty\n",
      "0\n",
      "top\n",
      "3\n"
     ]
    }
   ],
   "source": [
    "class Stack():\n",
    "    def __init__(self):\n",
    "        self.li = []\n",
    "    \n",
    "    def push(self, n):\n",
    "        self.li.append(n)\n",
    "        \n",
    "    def pop(self):\n",
    "        print(self.li.pop() if len(self.li) > 0 else -1)\n",
    "    \n",
    "    def size(self):\n",
    "        print(len(self.li))\n",
    "        \n",
    "    def empty(self):\n",
    "        print(1 if len(self.li) == 0 else 0)\n",
    "        \n",
    "    def top(self):\n",
    "        print(self.li[-1] if len(self.li) > 0 else -1)\n",
    "    \n",
    "stack = Stack()\n",
    "for _ in range(int(input())):\n",
    "    s = input().split()\n",
    "    if s[0] == \"push\":\n",
    "        stack.push(int(s[1]))\n",
    "    elif s[0] == \"pop\":\n",
    "        stack.pop()\n",
    "    elif s[0] == \"size\":\n",
    "        stack.size()\n",
    "    elif s[0] == \"empty\":\n",
    "        stack.empty()\n",
    "    elif s[0] == \"top\":\n",
    "        stack.top()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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   "title_cell": "Table of Contents",
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