摘要：Write a function to delete a node (except the tail) in a singly linked list, given only access to that node.Supposed the linked list is 1 -> 2 -> 3 ->... 阅读全文

摘要：Given a binary tree, find its maximum depth.The maximum depth is the number of nodes along the longest path from the root node down to the farthest le... 阅读全文

摘要：Description:Count the number of prime numbers less than a non-negative number,n.描述：计算小于n的质数的个数 这里用到的方法是埃拉托色尼筛选法(Sieve of Eratosthenes)，思路大致为：对于1~n-1这... 阅读全文

摘要：Write a program to check whether a given number is an ugly number.Ugly numbers are positive numbers whose prime factors only include2, 3, 5. For examp... 阅读全文

摘要：Given a non-negative integernum, repeatedly add all its digits until the result has only one digit.For example:Givennum = 38, the process is like:3 + ... 阅读全文