题解 | #树的子结构#

public class TreeNode {
    int val = 0;
    TreeNode left = null;
    TreeNode right = null;

    public TreeNode(int val) {
        this.val = val;

    }

}
*/
public class Solution {
    public boolean HasSubtree(TreeNode root1,TreeNode root2) {
        
     
        if(root1 == null || root2 == null){
            return false;
        }
        boolean isTree = false;
        if(root1.val == root2.val){
            isTree =  isSubTree(root1,root2) ;
        }
        if(isTree){
            return true;
        }
        return HasSubtree(root1.left,root2) || HasSubtree(root1.right, root2);
        
        
    }
    private boolean isSubTree(TreeNode root1, TreeNode root2){
        if(root2 == null){
            return true;
        }
        if(root1 == null){
            return false;
        }
        if(root1.val != root2.val){
            return false;
        }
        return isSubTree(root1.left, root2.left) &&isSubTree(root1.right,root2.right);
    }
}