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32 lines (31 loc) · 821 Bytes
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Solution.cs
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32 lines (31 loc) · 821 Bytes
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/**
* Definition for a binary tree node.
* public class TreeNode {
* public int val;
* public TreeNode left;
* public TreeNode right;
* public TreeNode(int val=0, TreeNode left=null, TreeNode right=null) {
* this.val = val;
* this.left = left;
* this.right = right;
* }
* }
*/
public class Solution
{
public IList<TreeNode> FindDuplicateSubtrees(TreeNode root)
{
DFS(root);
return ret;
}
IList<TreeNode> ret = [];
Dictionary<string, int> map = [];
string DFS(TreeNode root)
{
if (root is null) return "#";
string path = root.val + "," + DFS(root.left) + "," + DFS(root.right);
map[path] = map.GetValueOrDefault(path, 0) + 1;
if (map[path] == 2) ret.Add(root);
return path;
}
}