2022-04-17 Daily-Challenge

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Today I have done leetcode's April LeetCoding Challenge with cpp.

April LeetCoding Challenge 17

Description

Increasing Order Search Tree

Given the root of a binary search tree, rearrange the tree in in-order so that the leftmost node in the tree is now the root of the tree, and every node has no left child and only one right child.

Example 1:

img

Input: root = [5,3,6,2,4,null,8,1,null,null,null,7,9]
Output: [1,null,2,null,3,null,4,null,5,null,6,null,7,null,8,null,9]

Example 2:

img

Input: root = [5,1,7]
Output: [1,null,5,null,7]

Constraints:

  • The number of nodes in the given tree will be in the range [1, 100].
  • 0 <= Node.val <= 1000

Solution

class Solution {
  void traversal(TreeNode *&newCur, TreeNode *cur) {
    if(!cur) return;
    traversal(newCur, cur->left);
    newCur->right = new TreeNode(cur->val);
    newCur = newCur->right;
    traversal(newCur, cur->right);
  }
public:
  TreeNode* increasingBST(TreeNode* root) {
    TreeNode *newRoot = new TreeNode();
    TreeNode *tmp = newRoot;
    traversal(tmp, root);
    return newRoot->right;
  }
};

// Accepted
// 37/37 cases passed (3 ms)
// Your runtime beats 65.44 % of cpp submissions
// Your memory usage beats 19.7 % of cpp submissions (8 MB)
Algorithm