Leetcode
2020.05.04 09:08
872. Leaf-Similar Trees
조회 수 803 추천 수 0 댓글 0
Consider all the leaves of a binary tree. From left to right order, the values of those leaves form a leaf value sequence.
For example, in the given tree above, the leaf value sequence is (6, 7, 4, 9, 8).
Two binary trees are considered leaf-similar if their leaf value sequence is the same.
Return true if and only if the two given trees with head nodes root1 and root2 are leaf-similar.
Constraints:
- Both of the given trees will have between
1and200nodes. - Both of the given trees will have values between
0and200
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode() {}
* TreeNode(int val) { this.val = val; }
* TreeNode(int val, TreeNode left, TreeNode right) {
* this.val = val;
* this.left = left;
* this.right = right;
* }
* }
*/
class Solution {
public boolean leafSimilar(TreeNode root1, TreeNode root2) {
List<TreeNode> list1 = new ArrayList<>();
List<TreeNode> list2 = new ArrayList<>();
findLeaves(root1, list1);
findLeaves(root2, list2);
if(list1.size() != list2.size()){
return false;
}
int loop = list1.size();
for(int i=0; i<loop; i++){
TreeNode node1 = list1.get(i);
TreeNode node2 = list2.get(i);
//System.out.println(node1+" == "+node2);
if(node1.val != node2.val){
return false;
}
}
return true;
}
public void findLeaves(TreeNode node, List<TreeNode> list){
if(node == null){
return;
}
findLeaves(node.left, list);
findLeaves(node.right, list);
if(node.left == null && node.right == null){
list.add(node);
}
}
}[문제] https://leetcode.com/problems/leaf-similar-trees/
