sort_an_array.ipynb

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   "source": [
    "def sort_by_value_and_index(arr):\n",
    "    return [i[1] for i in sorted(enumerate(arr), key = lambda x: ((x[0]+1)*x[1]))]\n",
    "\n",
    "\n",
    "sort_by_value_and_index([ 23, 2, 3, 4, 5 ])"
   ]
  }
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