题目描述
输入两棵二叉树A，B，判断B是不是A的子结构。（ps：我们约定空树不是任意一个树的子结构）
示例1
输入
{8,8,#,9,#,2,#,5},{8,9,#,2}
返回值
true
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| /*
struct TreeNode {
int val;
struct TreeNode *left;
struct TreeNode *right;
TreeNode(int x) :
val(x), left(NULL), right(NULL) {
}
};*/
class Solution {
public:
bool HasSubtree(TreeNode* pRoot1, TreeNode* pRoot2) {
bool result = false;
if(pRoot1!=NULL&&pRoot2!=NULL)
{
if(pRoot1->val==pRoot2->val)
result = isSame(pRoot1,pRoot2);
if(!result)
result = HasSubtree(pRoot1->left, pRoot2);
if(!result)
result = HasSubtree(pRoot1->right, pRoot2);
}
return result;
}
bool isSame(TreeNode* pRoot1,TreeNode* pRoot2)
{
if(pRoot2==NULL)
return true;
if(pRoot1==NULL)
return false;
if(pRoot1->val!=pRoot2->val)
return false;
else
return isSame(pRoot1->left, pRoot2->left)&&isSame(pRoot1->right, pRoot2->right);
}
};
|