367. Valid Perfect Square.ipynb

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    "Given a positive integer num, write a function which returns True if num is a perfect square else False.\n",
    "\n",
    "Note: Do not use any built-in library function such as sqrt.\n",
    "\n",
    "Example 1:\n",
    "\n",
    "Input: 16\n",
    "Returns: True\n",
    "Example 2:\n",
    "\n",
    "Input: 14\n",
    "Returns: False"
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    "class Solution(object):\n",
    "    def isPerfectSquare(self, num):\n",
    "        \"\"\"\n",
    "        :type num: int\n",
    "        :rtype: bool\n",
    "        \"\"\"\n",
    "        if num <0: return False\n",
    "        if num==0 or num==1: return True\n",
    "        l=0\n",
    "        r=num\n",
    "        m=(l+r)//2\n",
    "        \n",
    "        while m!=l :\n",
    "            sq=m*m\n",
    "            \n",
    "            if sq==num: return True\n",
    "            if sq<num:\n",
    "                l=m\n",
    "                m=(l+r)//2\n",
    "            else:\n",
    "                r=m\n",
    "                m=(l+r)//2\n",
    "        \n",
    "        return False\n",
    "\n",
    "s=Solution()\n",
    "print(s.isPerfectSquare(9))\n",
    "        "
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