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import java.util.Stack;
import java.util.HashMap;
public class BinTree {
private char date;
private BinTree lchild;
private BinTree rchild;
public BinTree(char c) {
date = c;
}
// ÏÈÐò±éÀúµÝ¹é
public static void preOrder(BinTree t) {
if (t == null) {
return;
}
System.out.print(t.date);
preOrder(t.lchild);
preOrder(t.rchild);
}
// ÖÐÐò±éÀúµÝ¹é
public static void InOrder(BinTree t) {
if (t == null) {
return;
}
InOrder(t.lchild);
System.out.print(t.date);
InOrder(t.rchild);
}
// ºóÐò±éÀúµÝ¹é
public static void PostOrder(BinTree t) {
if (t == null) {
return;
}
PostOrder(t.lchild);
PostOrder(t.rchild);
System.out.print(t.date);
}
// ÏÈÐò±éÀú·ÇµÝ¹é
public static void preOrder2(BinTree t) {
Stack<BinTree> s = new Stack<BinTree>();
while (t != null || !s.empty()) {
while (t != null) {
System.out.print(t.date);
s.push(t);
t = t.lchild;
}
if (!s.empty()) {
t = s.pop();
t = t.rchild;
}
}
}
// ÖÐÐò±éÀú·ÇµÝ¹é
public static void InOrder2(BinTree t) {
Stack<BinTree> s = new Stack<BinTree>();
while (t != null || !s.empty()) {
while (t != null) {
s.push(t);
t = t.lchild;
}
if (!s.empty()) {
t = s.pop();
System.out.print(t.date);
t = t.rchild;
}
}
}
// ºóÐò±éÀú·ÇµÝ¹é
public static void PostOrder2(BinTree t) {
Stack<BinTree> s = new Stack<BinTree>();
Stack<Integer> s2 = new Stack<Integer>();
Integer i = new Integer(1);
while (t != null || !s.empty()) {
while (t != null) {
s.push(t);
s2.push(new Integer(0));
t = t.lchild;
}
while (!s.empty() && s2.peek().equals(i)) {
s2.pop();
System.out.print(s.pop().date);
}
if (!s.empty()) {
s2.pop();
s2.push(new Integer(1));
t = s.peek();
t = t.rchild;
}


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import java.util.*;
import java.io.*;
public class Client {
/**
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public static void main(String[] args) {
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