programmers2_124_system.ipynb

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  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Programmers - Coding Exercises Level 2 - 124 나라의 숫자\n",
    "- Source: https://programmers.co.kr/learn/courses/30/lessons/12899"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "def solution(n):\n",
    "    digits = []\n",
    "    while n > 0:\n",
    "        r = (n - 1) % 3\n",
    "        n = (n - 1) // 3\n",
    "        digits.insert(0, r)\n",
    "        \n",
    "    to_124 = {0: '1', 1: '2', 2: '4'}\n",
    "    digits_124 = [to_124[d] for d in digits]\n",
    "    return ''.join(digits_124)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Input-Output Examples:**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<div>\n",
       "<style scoped>\n",
       "    .dataframe tbody tr th:only-of-type {\n",
       "        vertical-align: middle;\n",
       "    }\n",
       "\n",
       "    .dataframe tbody tr th {\n",
       "        vertical-align: top;\n",
       "    }\n",
       "\n",
       "    .dataframe thead th {\n",
       "        text-align: right;\n",
       "    }\n",
       "</style>\n",
       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>n</th>\n",
       "      <th>return</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <td>0</td>\n",
       "      <td>1</td>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <td>1</td>\n",
       "      <td>3</td>\n",
       "      <td>4</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <td>2</td>\n",
       "      <td>4</td>\n",
       "      <td>11</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <td>3</td>\n",
       "      <td>45</td>\n",
       "      <td>1124</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
       "</div>"
      ],
      "text/plain": [
       "    n  return\n",
       "0   1       1\n",
       "1   3       4\n",
       "2   4      11\n",
       "3  45    1124"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import pandas as pd\n",
    "examples = pd.DataFrame([\n",
    "    [1, 1], [3, 4], [4, 11], [45, 1124]\n",
    "], columns=[\"n\", \"return\"])\n",
    "examples"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1\n",
      "4\n",
      "11\n",
      "1124\n"
     ]
    }
   ],
   "source": [
    "print(solution(*examples.values[0, :-1].tolist()))\n",
    "print(solution(*examples.values[1, :-1].tolist()))\n",
    "print(solution(*examples.values[2, :-1].tolist()))\n",
    "print(solution(*examples.values[3, :-1].tolist()))"
   ]
  }
 ],
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