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Main.java
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Main.java
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package com.company;
import java.util.*;
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;
}
}
public class Main {
public static void main(String[] args) {
// write your code here
}
public List<Integer> rightSideView(TreeNode root) {
List<Integer> res = new ArrayList<>();
if(root == null) return res;
ArrayDeque<TreeNode> queue = new ArrayDeque<>(){{offer(root);}};
while (!queue.isEmpty()){
int count = queue.size();
for (int i = 0; i < count; i++) {
TreeNode cur = queue.poll();
if(cur.left != null) queue.offer(cur.left);
if(cur.right != null) queue.offer(cur.right);
if(i == count - 1) res.add(cur.val);
}
}
return res;
}
}