题目:有四个数字:1、2、3、4,能组成多少个互不相同且无重复数字的三位数?各是多少? 来看第一种解法 这种解法时间复杂度为O(n2), 其中的列表可以换成range生成器 以上两种解法都可以改成列表推导式的形式,如下,这种形式看上去简洁,但如果出错了排查 ...
Given an array of digits, return the largest hour time that can be made. The smallest hour time is : , and the largest is : . Starting from : , a time is larger if more time has elapsed since midnigh ...
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题目:有四个数字:1、2、3、4,能组成多少个互不相同且无重复数字的三位数?各是多少? 来看第一种解法 这种解法时间复杂度为O(n2), 其中的列表可以换成range生成器 以上两种解法都可以改成列表推导式的形式,如下,这种形式看上去简洁,但如果出错了排查 ...
We have a sorted set of digits `D`, a non-empty subset of `{'1','2','3','4','5','6','7','8','9'}`. (Note that `'0'` is not included.) Now, we ...
Given a non-negative integer num, repeatedly add all its digits until the result has only one digit. Example: Follow up:Could you do ...
In a given integer array nums, there is always exactly one largest element. Find whether the largest element in the array is at least twice ...
Given a non-empty string containing an out-of-order English representation of digits 0-9, output the digits in ascending order. Note: Input ...
一个匹配数字和字母密码的正则表达式 2011 年 12 月 14 日 | Filed under: 正则表达式 and tagged with: 密码 , 正则表达式 , 零宽断言 一个用户注册功能的密码有如下要求:由数字和字母组成,并且要同时含有数字和字母,且长度要在 ...
In a 2D grid from (0, 0) to (N-1, N-1), every cell contains a 1, except those cells in the given list mines which are 0. What ...
Given a list of non negative integers, arrange them such that they form the largest number. Example 1: Example 2: Note: The result may ...