Given a Binary Search Tree (BST) with the root node root, return the minimum difference between the values of any two different nodes in the tree.

Example :

Input: root = [4,2,6,1,3,null,null]
Output: 1
Explanation:
Note that root is a TreeNode object, not an array. The given tree [4,2,6,1,3,null,null] is represented by the following diagram: 4
/ \
2 6
/ \
1 3 while the minimum difference in this tree is 1, it occurs between node 1 and node 2, also between node 3 and node 2.

Note:

  1. The size of the BST will be between 2 and 100.
  2. The BST is always valid, each node's value is an integer, and each node's value is different.

思路:

遍历二叉树,将元素值排序,最小的差肯定出现在相邻两个元素里,遍历数组即可。

 void preorderTree(TreeNode* root,vector<int>& vc)
{
if(root ==NULL) return ;
vc.push_back(root->val);
preorderTree(root->left,vc);
preorderTree(root->right,vc);
}
int minDiffInBST(TreeNode* root)
{
vector<int>vc;
preorderTree(root,vc);
sort(vc.begin(),vc.end());
int t =INT_MAX;
for(int i=;i<vc.size()-;i++)
{
t = min(t,vc[i+] - vc[i]);
}
return t;
}

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