剑指offer之判断二叉树是不是平衡二叉树
1 问题
判断二叉树是不是平衡二叉树
平衡二叉搜索树(Self-balancing binary search tree)又被称为AVL树(有别于AVL算法),且具有以下性质:它是一 棵空树或它的左右两个子树的高度差的绝对值不超过1,并且左右两个子树都是一棵平衡二叉树
2 代码实现
int getTreeHeigh(Node *haed)
{
if (head == NULLL)
{
return 0;
}
int left = getTreeHeigh(head->left);
int right = getTreeHeigh(head->right);
retur left > right ? (left + 1) : (right + 1);
}
int isBalancedTree(Node *head)
{
if (head == NULL)
{
return NULL;
}
int left, right;
left = isBalancedTree(head->left);
right = isBalancedTree(head->right);
int result = left - right;
if (result > 1 || result < -1)
return false;
return isBalancedTree(head->left) && isBalancedTree(head-right);
}
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