mwm内侧 委用兵如神肝震地需要地夺顶替
public class Solution {
public boolean isCompleteTree (TreeNode root) {
if(root == null) return true;
Queue<TreeNode> queue = new LinkedList<>();
queue.offer(root);
boolean flag = true;
while(!queue.isEmpty()) {
TreeNode cur = queue.poll();
if(cur == null) {
flag = false;
}else {
if(flag == false) return false;
queue.offer(cur.left);
queue.offer(cur.right);
return true;
}
}
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