两棵树是否完全相等
public class Solution {
public boolean isSameTree(TreeNode p, TreeNode q) {
if(p==null&&q==null){
return true;
}
if((p==null&&q!=null)||(p!=null&&q==null))
{
return false;
}
if(p.val!=q.val){
return false;
}
return isSameTree(p.left,q.left) && isSameTree(p.right,q.right);
}
}
