programmers1_marathon_renouncer.ipynb

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   "source": [
    "### Programmers - Coding Exercises Level 1: 완주하지 못한 선수\n",
    "- Source: https://programmers.co.kr/learn/courses/30/lessons/42576"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "from collections import Counter\n",
    "\n",
    "\n",
    "def solution(participant, completion):\n",
    "    answer = list((Counter(participant) - Counter(completion)).keys())[0]\n",
    "    return answer"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Input-Output Examples:**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "data": {
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       "<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>participant</th>\n",
       "      <th>completion</th>\n",
       "      <th>return</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <td>0</td>\n",
       "      <td>[leo, kiki, eden]</td>\n",
       "      <td>[eden, kiki]</td>\n",
       "      <td>leo</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <td>1</td>\n",
       "      <td>[marina, josipa, nikola, vinko, filipa]</td>\n",
       "      <td>[josipa, filipa, marina, nikola]</td>\n",
       "      <td>vinko</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <td>2</td>\n",
       "      <td>[mislav, stanko, mislav, ana]</td>\n",
       "      <td>[stanko, ana, mislav]</td>\n",
       "      <td>mislav</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
       "</div>"
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      "text/plain": [
       "                               participant                        completion  \\\n",
       "0                        [leo, kiki, eden]                      [eden, kiki]   \n",
       "1  [marina, josipa, nikola, vinko, filipa]  [josipa, filipa, marina, nikola]   \n",
       "2            [mislav, stanko, mislav, ana]             [stanko, ana, mislav]   \n",
       "\n",
       "   return  \n",
       "0     leo  \n",
       "1   vinko  \n",
       "2  mislav  "
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import pandas as pd\n",
    "examples = pd.DataFrame([\n",
    "    [[\"leo\", \"kiki\", \"eden\"], [\"eden\", \"kiki\"], \"leo\"],\n",
    "    [[\"marina\", \"josipa\", \"nikola\", \"vinko\", \"filipa\"], [\"josipa\", \"filipa\", \"marina\", \"nikola\"], \"vinko\"],\n",
    "    [[\"mislav\", \"stanko\", \"mislav\", \"ana\"], [\"stanko\", \"ana\", \"mislav\"], \"mislav\"]\n",
    "], columns=[\"participant\", \"completion\", \"return\"])\n",
    "examples"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "leo\n",
      "vinko\n",
      "mislav\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()))"
   ]
  }
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