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Author: assassint2017

Leaf-Similar Trees/Leaf-Similar_Trees.cpp

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+// Runtime: 0 ms, faster than 100.00% of C++ online submissions for Leaf-Similar Trees.
+// Memory Usage: 13.3 MB, less than 88.89% of C++ online submissions for Leaf-Similar Trees.
+
+/**
+ * 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:
+    bool leafSimilar(TreeNode* root1, TreeNode* root2) 
+    {
+        vector<int> leaf1;
+        vector<int> leaf2;
+
+        traversal(leaf1, root1);
+        traversal(leaf2, root2);
+
+        if (leaf1.size() != leaf2.size())
+        {
+            return false;
+        }
+        else
+        {
+            for (int i = 0; i < leaf1.size(); ++i)
+            {
+                if (leaf1[i] != leaf2[i])
+                {
+                    return false;
+                }
+            }
+            return true;
+        }
+    }
+private:
+    void traversal(vector<int>& res, TreeNode* root)
+    {
+        stack<TreeNode*> memo;
+
+        while (!memo.empty() || root)
+        {
+            while (root)
+            {
+                if (root->left == nullptr && root->right == nullptr)
+                {
+                    res.push_back(root->val);
+                }
+                memo.push(root);
+                root = root->left;
+            }
+            if (!memo.empty())
+            {
+                root = memo.top();
+                memo.pop();
+
+                root = root->right;
+            }
+        }
+    }
+};