https://oj.leetcode.com/problems/convert-sorted-array-to-binary-search-tree/

Signed-off-by: GQHero <GQHero@163.com>
https://oj.leetcode.com/problems/minimum-depth-of-binary-tree/

Signed-off-by: GQHero <GQHero@163.com>
https://oj.leetcode.com/problems/balanced-binary-tree/

Signed-off-by: GQHero <GQHero@163.com>