摘要： An inorder binary tree traversal can be implemented in a non-recursive way with a stack. For example, suppose that when a 6-node binary tree (with the 阅读全文

摘要： For any 4-digit integer except the ones with all the digits being the same, if we sort the digits in non-increasing order first, and then in non-decre 阅读全文

摘要： This time, you are supposed to help us collect the data for family-owned property. Given each person's family members, and the estate（房产）info under hi 阅读全文