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View Compilation Error

0_0_8787394_18629\Main.java:41: 找不到符号
符号: 类 BinaryTree
位置: 类 Main
	    public static BinaryTree buildTree(String[] strpre, String[] strmid){ 
	                  ^
0_0_8787394_18629\Main.java:87: 找不到符号
符号: 类 BinaryTree
位置: 类 Main
      public static void lastorder(BinaryTree bt){
                                   ^
0_0_8787394_18629\Main.java:33: 找不到符号
符号: 类 BinaryTree
位置: 类 Main
	            BinaryTree bt = buildTree(strpre, strmid);
	            ^
0_0_8787394_18629\Main.java:48: 找不到符号
符号: 类 BinaryTree
位置: 类 Main
	        BinaryTree root = new BinaryTree(s); 
	        ^
0_0_8787394_18629\Main.java:48: 找不到符号
符号: 类 BinaryTree
位置: 类 Main
	        BinaryTree root = new BinaryTree(s); 
	                              ^
5 错误


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