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    "https://leetcode.com/problems/check-if-n-and-its-double-exist/\n",
    "\n",
    "\n",
    "\n",
    "Runtime: 0 ms, faster than 100.00% of C++ online submissions for Check If N and Its Double Exist.\n",
    "Memory Usage: 10.3 MB, less than 62.72% of C++ online submissions for Check If N and Its Double Exist.\n",
    "\n",
    "\n",
    "\n",
    "```cpp\n",
    "#include <vector>\n",
    "#include <bits/stdc++.h>\n",
    "#include <algorithm>\n",
    "\n",
    "using namespace std;\n",
    "\n",
    "class Solution {\n",
    "public:\n",
    "    bool checkIfExist(vector<int>& arr) {\n",
    "        for (int i=0; i < arr.size(); ++i) {\n",
    "            int v = arr[i];\n",
    "            int d_v = v * 2;\n",
    "            auto found = find(arr.begin(), arr.end(), d_v);\n",
    "            if (found != arr.end()) {\n",
    "                if ((found - arr.begin()) != i) {\n",
    "                    return true;\n",
    "                }\n",
    "            }\n",
    "        }\n",
    "        return false;\n",
    "    }\n",
    "};\n",
    "```"
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