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   "source": [
    "https://leetcode.com/problems/linked-list-cycle-ii\n",
    "\n",
    "\n",
    "Runtime: 120 ms, faster than 9.85% of C++ online submissions for Linked List Cycle II.\n",
    "Memory Usage: 8.2 MB, less than 16.94% of C++ online submissions for Linked List Cycle II.\n",
    "\n",
    "\n",
    "```cpp\n",
    "class Solution {\n",
    "public:\n",
    "    ListNode *detectCycle(ListNode *head) {\n",
    "      //6:41\n",
    "      vector<ListNode*> l;\n",
    "      auto ok = false;\n",
    "      auto index = 0;\n",
    "      auto node = head;\n",
    "      while (node != nullptr) {\n",
    "        if (find(l.begin(), l.end(), node) != l.end()) {\n",
    "          ok = true;\n",
    "        }\n",
    "        l.push_back(node);\n",
    "        if (ok) {\n",
    "          return l[index];\n",
    "        }\n",
    "        node = node->next;\n",
    "        index++;\n",
    "      }\n",
    "      return nullptr;\n",
    "      //6:44\n",
    "    }\n",
    "};\n",
    "```"
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