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+// 530. Minimum Absolute Difference in BST
+#include "leetcode.h"
+
+/*
+ * given the 'root' of a binary search tree (bst), return the minimum absolute
+ * difference between the values of any two different nodes in the tree
+ */
+
+class Solution {
+ int diff = INT_MAX;
+ TreeNode *prev = NULL;
+ void dfs(TreeNode *root) {
+ if (root->left)
+ dfs(root->left);
+ if (prev)
+ diff = min(diff, abs(prev->val - root->val));
+ prev = root;
+ if (root->right)
+ dfs(root->right);
+ }
+
+public:
+ int getMinimumDifference(TreeNode *root) {
+ dfs(root);
+ return diff;
+ }
+};