二叉树的非递归遍历是怎么样的?二叉树的非递归遍历也是采用的是递归的思想,拿前序遍历为例:先通过找到最左下角的节点,然后将其输出,并且对此节点的右子树再进行下一步的操作。
前序遍历:
public void pre_iteration(node p) {if (p == null) return;
stack<node> stack = new stack<>();while (!stack.isempty() || p != null) {while (p != null) {
system.out.println(p.val);
stack.push(p);
p = p.left;
}if (!stack.isempty()) {
p = stack.pop();
p = p.right;
}
}
}
中序遍历:
public void in_iteration(node p) {if (p == null) return;
stack<node> stack = new stack<>();while (!stack.isempty() || p != null) {while (p != null) {
stack.push(p);
p = p.left;
}if (!stack.isempty()) {
p = stack.pop();
system.out.println(p.val);
p = p.right;
}
}
}
后序遍历:(stack2是用来记载当前节点的右子树是否已经被遍历过)
public static void post_iteration(node p) {if (p == null) return;
stack<node> stack = new stack<>();
stack<boolean> stack2 = new stack<>();while (!stack.isempty() || p != null) {while (p != null) {
stack.push(p);
stack2.push(false);
p = p.left;
}while (!stack.isempty() && stack2.peek()) {
system.out.println(stack.pop().val);
stack2.pop();
}if (!stack.isempty()) {
p = stack.peek().right;
stack2.pop();
stack2.push(true);
}
}
}
以上就是关于二叉树的非递归遍历实例代码分享的详细内容。