该死的,我很接近得到这个达到预期效果!有谁知道为什么这仍然达不到要求的结果?
package tree;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class Tree {
private final static int BLACK = 1;
private final static int RED = 2;
private Tree left = null;
private Tree right = null;
private int color = BLACK;
private String value = "";
Tree(final Tree left, final Tree right, final int color, final String value) {
this.left = left;
this.right = right;
this.color = color;
this.value = value;
}
Tree getLeft() {
return left;
}
Tree getRight() {
return right;
}
int getColor() {
return color;
}
String getValue() {
return value;
}
public static void main(String[] args) {
Tree leaf1 = new Tree(null, null, RED, "20");
Tree leaf2 = new Tree(null, null, BLACK, "30");
Tree leaf3 = new Tree(null, null, RED, "2");
Tree leaf4 = new Tree(null, null, RED, "100");
Tree leaf5 = new Tree(null, null, BLACK, "5");
Tree middle1 = new Tree(leaf1, leaf2, RED, "40");
Tree middle2 = new Tree(middle1, leaf3, BLACK, "200");
Tree middle3 = new Tree(leaf4, leaf5, RED, "3");
Tree root = new Tree(middle2, middle3, RED, "50");
printTree(root);
}
static void printTree(final Tree t) {
final Map<Tree, Integer> widths = new HashMap<Tree, Integer>();
final Map<Tree, Integer> offsets = new HashMap<Tree, Integer>();
setWidths(widths, t);
setOffsets(offsets, widths, t, widths.get(t)/2);
final List<Tree> root = new ArrayList<Tree>();
root.add(t);
printTree(offsets, root);
}
static int setWidths(final Map<Tree, Integer> widths, final Tree t) {
if(widths.containsKey(t))
return widths.get(t);
int width = (t.getColor() == BLACK) ? t.getValue().length()
: t.getValue().length() + 2;
final Tree left = t.getLeft();
final Tree right = t.getRight();
if(left != null)
width += setWidths(widths, left);
if(right != null)
width += setWidths(widths, right);
widths.put(t, width);
return width;
}
static void setOffsets(final Map<Tree, Integer> offsets, final Map<Tree, Integer> widths,
final Tree t, final int offset) {
offsets.put(t, offset);
System.out.println("Parent offset for node " + t.getValue() + ", offset " + offset);
final Tree left = t.getLeft();
final Tree right = t.getRight();
if(left != null)
setOffsets(offsets, widths, left, offset - widths.get(left)/2);
if(right != null)
setOffsets(offsets, widths, right, offset + widths.get(right)/2);
}
static void printTree(final Map<Tree, Integer> offsets, final List<Tree> trees) {
if(trees.isEmpty())
return;
final List<Tree> children = new ArrayList<Tree>();
int linePos = 0;
for(int i = 0; i < trees.size(); ++i) {
final Tree t = trees.get(i);
int offset = offsets.get(t);
final char[] lead = new char[Math.max(offset - linePos, 0)];
Arrays.fill(lead, ' ');
System.out.print(new String(lead));
linePos += Math.max(offset, 0);
if(t.getColor() == RED) {
System.out.print(t.getValue());
linePos += t.getValue().length();
} else {
System.out.print("<" + t.getValue() + ">");
linePos += t.getValue().length() + 2;
}
if(t.getLeft() != null)
children.add(t.getLeft());
if(t.getRight() != null)
children.add(t.getRight());
}
System.out.println("");
printTree(offsets, children);
}
}
我已经编辑了我的项目的代码,并且现在正在测试它。它肯定会开始寻找应有的方式。如果我找到一个修复程序,它会保持这个更新,所以它完全有效非常感谢! – Aerus
稍后我会再试一次。实际上比我想象的更困难。 –
我仍然通过代码进行了一些操作,但是一旦某个节点的右侧子树的子树必须被打印,似乎就会出错。因此,根打印正确,他的右边的孩子打印正确,但正确的孩子的子树不知何故转移到左边...... – Aerus