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| author | crupest <crupest@outlook.com> | 2020-10-02 18:52:07 +0800 |
|---|---|---|
| committer | crupest <crupest@outlook.com> | 2020-10-02 18:52:07 +0800 |
| commit | a62676feb90dadca5d0cac9a9046f9a6641cc6a2 (patch) | |
| tree | dc3e90361af6c190f04b2a72d2789583c0572587 /works | |
| parent | 82ba233d73f0b5feb9bd046e1fc20a2f10dc34a9 (diff) | |
| download | crupest-a62676feb90dadca5d0cac9a9046f9a6641cc6a2.tar.gz crupest-a62676feb90dadca5d0cac9a9046f9a6641cc6a2.tar.bz2 crupest-a62676feb90dadca5d0cac9a9046f9a6641cc6a2.zip | |
import(solutions): Add problem 865 .
Diffstat (limited to 'works')
| -rw-r--r-- | works/solutions/cpp/865.cpp | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/works/solutions/cpp/865.cpp b/works/solutions/cpp/865.cpp new file mode 100644 index 0000000..8981a02 --- /dev/null +++ b/works/solutions/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);
+ }
+};
|