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View Compilation Error

0_0_39829504_26206\Main.java:5: 错误: 找不到符号
  public void levelIterator(BiTree root)
                            ^
  符号:   类 BiTree
  位置: 类 Main
0_0_39829504_26206\Main.java:11: 错误: 找不到符号
	  LinkedList<BiTree> queue = new LinkedList<BiTree>();
	             ^
  符号:   类 BiTree
  位置: 类 Main
0_0_39829504_26206\Main.java:11: 错误: 找不到符号
	  LinkedList<BiTree> queue = new LinkedList<BiTree>();
	                                            ^
  符号:   类 BiTree
  位置: 类 Main
0_0_39829504_26206\Main.java:12: 错误: 找不到符号
	  BiTree current = null;
	  ^
  符号:   类 BiTree
  位置: 类 Main
4 个错误


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