摘要:
Given an integer n, count the total number of digit 1 appearing in all non-negative integers less than or equal to n.For example:Given n = 13,Return 6... 阅读全文
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 is1 -> 2 -> 3 -> ... 阅读全文
摘要:
Given a roman numeral, convert it to an integer.Input is guaranteed to be within the range from 1 to 3999.【罗马数字】1~9: {"I", "II", "III", "IV", "V", "VI... 阅读全文
摘要:
Given a non-negative number represented as an array of digits, plus one to the number.The digits are stored such that the most significant digit is at... 阅读全文