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     "text": [
      "[[1, 10], [11, 18], [19, 22]]\n"
     ]
    }
   ],
   "source": [
    "# ---------------------------------------------------------------\n",
    "# python best courses https://courses.tanpham.org/\n",
    "\n",
    "\"\"\"\n",
    "Given a collection of intervals which are already sorted by start number, merge all overlapping intervals.\n",
    "For example,\n",
    "Given [[1,3],[2,6],[5,10],[11,16],[15,18],[19,22]],\n",
    "return [[1, 10], [11, 18], [19, 22]]\n",
    "\"\"\"\n",
    "\n",
    "org_intervals = [[1,3],[2,6],[5,10],[11,16],[15,18],[19,22]]\n",
    "\n",
    "i = 0\n",
    "\n",
    "while i < len(org_intervals)-1:\n",
    "#     print(org_intervals[i])\n",
    "    if org_intervals[i+1][0] < org_intervals[i][1]:\n",
    "        org_intervals[i][1]=org_intervals[i+1][1]\n",
    "        del org_intervals[i+1]\n",
    "        i = i - 1\n",
    "    i = i + 1\n",
    "\n",
    "print(org_intervals)"
   ]
  }
 ],
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