墨云黑

摘要： Pseudo-Palindromic Paths in a Binary Tree (M) 题目 Given a binary tree where node values are digits from 1 to 9. A path in the binary tree is said to be 阅读全文

摘要： Reach a Number (M) 题目 You are standing at position 0 on an infinite number line. There is a goal at position target. On each move, you can either go l 阅读全文