1026. Maximum Difference Between Node and Ancestor.cpp

keineahnung2345 · Mar 2, 2020 · 4415808 · 4415808
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+//https://leetcode.com/problems/maximum-difference-between-node-and-ancestor/discuss/274610/JavaC%2B%2BPython-Top-Down
+
+//Top Down
+//Runtime: 4 ms, faster than 96.94% of C++ online submissions for Maximum Difference Between Node and Ancestor.
+//Memory Usage: 11.9 MB, less than 86.36% of C++ online submissions for Maximum Difference Between Node and Ancestor.
+
+/**
+ * Definition for a binary tree node.
+ * struct TreeNode {
+ *     int val;
+ *     TreeNode *left;
+ *     TreeNode *right;
+ *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
+ * };
+ */
+class Solution {
+public:
+    int maxAncestorDiffMM(TreeNode* node, int mx, int mn){
+        return node ? max(maxAncestorDiffMM(node->left, max(node->val, mx), min(node->val, mn)),
+                    maxAncestorDiffMM(node->right, max(node->val, mx), min(node->val, mn))): mx-mn;
+    }
+
+    int maxAncestorDiff(TreeNode* root) {
+        return maxAncestorDiffMM(root, 0, INT_MAX);
+    }
+};