include file

Author: poorvikaa08

124. Binary Tree Maximum Path Sum.cpp

@@ -0,0 +1,30 @@
+/**
+ * Definition for a binary tree node.
+ * struct TreeNode {
+ *     int val;
+ *     TreeNode *left;
+ *     TreeNode *right;
+ *     TreeNode() : val(0), left(nullptr), right(nullptr) {}
+ *     TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
+ *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
+ * };
+ */
+class Solution {
+public:
+    int solve(TreeNode* root, int &maxSum){
+        if(!root) return 0;
+
+        int leftHeight = max(0, solve(root->left, maxSum));
+        int rightHeight = max(0, solve(root->right, maxSum));
+
+        maxSum = max(maxSum, leftHeight + rightHeight + root->val);
+        return max(leftHeight, rightHeight) + root->val;
+    }
+
+    int maxPathSum(TreeNode* root) {
+        int maxSum = INT_MIN;
+        solve(root, maxSum);
+
+        return maxSum;
+    }
+};