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    "https://leetcode.com/problems/minimum-absolute-difference-in-bst\n",
    "\n",
    "\n",
    "Runtime: 36 ms, faster than 13.13% of C++ online submissions for Minimum Absolute Difference in BST.\n",
    "Memory Usage: 30.4 MB, less than 7.17% of C++ online submissions for Minimum Absolute Difference in BST.\n",
    "\n",
    "\n",
    "```cpp\n",
    "#include <iostream>\n",
    "#include <bits/stdc++.h>\n",
    "#include <math.h>\n",
    "#include <set>\n",
    "\n",
    "using namespace std;\n",
    "\n",
    "/*\n",
    "struct TreeNode\n",
    "{\n",
    "    int val;\n",
    "    TreeNode *left;\n",
    "    TreeNode *right;\n",
    "    TreeNode() : val(0), left(nullptr), right(nullptr) {}\n",
    "    TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}\n",
    "    TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}\n",
    "};\n",
    "*/\n",
    "\n",
    "class Solution\n",
    "{\n",
    "public:\n",
    "    set<int, less<int> > set1;\n",
    "    int getMinimumDifference(TreeNode *root)\n",
    "    {\n",
    "        set1.clear();\n",
    "        travel(root);\n",
    "        std::vector<int> vector1(set1.size());\n",
    "        std::copy(set1.begin(), set1.end(), vector1.begin());\n",
    "        int minV = INT_MAX;\n",
    "        for (size_t i=0; i < vector1.size(); ++i) {\n",
    "            if (i != 0) {\n",
    "                int v2 = vector1[i];\n",
    "                int v1 = vector1[i-1];\n",
    "                int diff = v2 - v1;\n",
    "                if (diff < minV) {\n",
    "                    minV = diff;\n",
    "                }\n",
    "            }\n",
    "        }\n",
    "        return minV;\n",
    "    }\n",
    "    void travel(TreeNode *root) {\n",
    "        if (root == nullptr) {\n",
    "            return;\n",
    "        }\n",
    "        set1.insert(root->val);\n",
    "        travel(root->left);\n",
    "        travel(root->right);\n",
    "    }\n",
    "};\n",
    "```"
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