From 185ef9fcb0e59f13e9ee0ccb261693cdaddebab0 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Tue, 23 Feb 2021 21:07:19 +0800
Subject: import(solutions): Move leetcode solutions to subdir.

---
 works/solutions/leetcode/cpp/865.cpp | 60 ++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 works/solutions/leetcode/cpp/865.cpp

(limited to 'works/solutions/leetcode/cpp/865.cpp')

diff --git a/works/solutions/leetcode/cpp/865.cpp b/works/solutions/leetcode/cpp/865.cpp
new file mode 100644
index 0000000..8981a02
--- /dev/null
+++ b/works/solutions/leetcode/cpp/865.cpp
@@ -0,0 +1,60 @@
+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) {}
+};
+
+#include <unordered_set>
+
+class Solution
+{
+public:
+    int max_depth = -1;
+    std::unordered_set<TreeNode *> deepest_nodes;
+
+    void record_depth(TreeNode *root, int depth)
+    {
+        if (depth > max_depth)
+        {
+            max_depth = depth;
+            deepest_nodes.clear();
+        }
+
+        if (depth == max_depth)
+            deepest_nodes.insert(root);
+
+        if (root->left != nullptr)
+            record_depth(root->left, depth + 1);
+        if (root->right != nullptr)
+            record_depth(root->right, depth + 1);
+    }
+
+    TreeNode *find_common_ancestor(TreeNode *root)
+    {
+        if (root == nullptr)
+            return nullptr;
+        if (deepest_nodes.find(root) != deepest_nodes.cend())
+            return root;
+
+        auto left = find_common_ancestor(root->left);
+        auto right = find_common_ancestor(root->right);
+
+        if (left != nullptr && right != nullptr)
+            return root;
+        if (left != nullptr)
+            return left;
+        if (right != nullptr)
+            return right;
+        return nullptr;
+    }
+
+    TreeNode *subtreeWithAllDeepest(TreeNode *root)
+    {
+        record_depth(root, 0);
+        return find_common_ancestor(root);
+    }
+};
-- 
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