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{
"cells": [
{
"cell_type": "code",
"execution_count": 2,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"['0-->2']\n",
"['0-->2', '4-->5']\n",
"['0-->2', '4-->5', '7']\n",
"['0-->2', '4-->5', '7']\n"
]
}
],
"source": [
"\"\"\"\n",
"Given a sorted integer array without duplicates,\n",
"return the summary of its ranges.\n",
"For example, given [0,1,2,4,5,7], return [\"0->2\",\"4->5\",\"7\"].\n",
"\"\"\"\n",
"\n",
"input_array = [0,1,2,4,5,7]\n",
"# input_array = [1,2,3,6,9,11,12,13,14,19,20]\n",
"\n",
"start=0\n",
"result = []\n",
"\n",
"# i=0\n",
"# while i <= len(input_array)-1:\n",
"# print(i, input_array[i])\n",
"# i = i+1\n",
"\n",
"\n",
"while start < len(input_array):\n",
" \n",
" # initial end at start position \n",
" end = start\n",
"\n",
" # continue to move the end pointer if the gap is 1 with beside number\n",
" # only continue to move if index end+1 is inside array \n",
" while end+1<len(input_array) and ((input_array[end+1] - input_array[end]) == 1):\n",
" end = end + 1\n",
"\n",
" # add range to result after calculate \n",
" if end!=start:\n",
" result.append(\"{0}-->{1}\".format(input_array[start], input_array[end]))\n",
" print(result)\n",
" else:\n",
" result.append(\"{0}\".format(input_array[start]))\n",
" print(result)\n",
" \n",
" # change to next range\n",
" start = end+1\n",
"\n",
"print(result)\n",
"\n",
"\n",
" "
]
}
],
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"language": "python",
"name": "python3"
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"file_extension": ".py",
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