题目:
Given two binary trees, write a function to check if they are equal or not.
Two binary trees are considered equal if they are structurally identical and the nodes have the same value.
解答:
bool isSameTree(TreeNode *p, TreeNode *q)
{
if (!p && !q)
{
return true;
}
if (!p && q || p && !q || p->val != q->val)
{
return false;
}
bool left = isSameTree(p->left, q->left);
bool right = isSameTree(p->right, q->right);
return left && right;
}