摘要：
"Forever number" is a positive integer A with K digits, satisfying the following constrains: the sum of all the digits of A is m; the sum of all the d 阅读全文
摘要：
Dijkstra's algorithm is one of the very famous greedy algorithms. It is used for solving the single source shortest path problem which gives the short 阅读全文
摘要：
Given a syntax tree (binary), you are supposed to output the corresponding postfix expression, with parentheses reflecting the precedences of the oper 阅读全文
摘要：
Given two singly linked lists L1=a1→a2→⋯→an−1→an and L2=b1→b2→⋯→bm−1→bm. If n≥2m, you are supposed to reverse and merge 阅读全文
摘要：
给定一个n*m的二维整数数组，用来表示一个迷宫，数组中只包含0或1，其中0表示可以走的路，1表示不可通过的墙壁。 最初，有一个人位于左上角(1, 1)处，已知该人每次可以向上、下、左、右任意一个方向移动一个位置。 请问，该人从左上角移动至右下角(n, m)处，至少需要移动多少次。 数据保证(1, 1 阅读全文
摘要：
Suppose that all the keys in a binary tree are distinct positive integers. Given the postorder and inorder traversal sequences, a binary tree can be u 阅读全文
摘要：
Telefraud（电信诈骗） remains a common and persistent problem in our society. In some cases, unsuspecting victims lose their entire life savings. To stop th 阅读全文
摘要：
Zhejiang University is about to celebrate her 122th anniversary in 2019. To prepare for the celebration, the alumni association （校友会） has gathered the 阅读全文
摘要：
Sexy primes are pairs of primes of the form (p, p+6), so-named since "sex" is the Latin word for "six". (Quoted from http://mathworld.wolfram.com/Sexy 阅读全文
摘要：
The "eight queens puzzle" is the problem of placing eight chess queens on an 8×8 chessboard so that no two queens threaten each other. Thus, a solutio 阅读全文