［抄题］: Given an integer n, return 1 - n in lexicographical order. For example, given 13, return: [1,10,11,12,13,2,3,4,5,6,7,8,9]. Please optimize your algorithm to use less time and space. The input size may be as large as 5,000,000. [暴力解法]: 时间分析: 空间分…

[LeetCode]386. Lexicographical Numbers 解题报告(Python) 标签(空格分隔): LeetCode 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.me/ 题目地址:https://leetcode.com/problems/lexicographical-numbers/description/ 题目描述: Given an integer n, return 1 - n in lexicogra…

Given an integer n, return 1 - n in lexicographical order. For example, given 13, return: [1,10,11,12,13,2,3,4,5,6,7,8,9]. Please optimize your algorithm to use less time and space. The input size may be as large as 5,000,000. 按字典序求所给范围数字列表 回溯,dfs cl…

用DFS来做,先弄开头是1的,再弄开头是1的里面开头是1的,再开头是1的里面开头是1的里的开头是1的,再... 是吧-- 比N大了BREAK就行. 注意第一个循环是1-9,往后的循环是0-9. public class Solution { public List<Integer> lexicalOrder(int n) { List<Integer> res = new ArrayList<>(); for(int i = 1; i < 10; i++) { h…

https://leetcode.com/problems/lexicographical-numbers/description/ 前20个是 1, 10, 11, 12, 13, 14, .....19 2, 20, 3, 4, 5, 6, ....9 class Solution { public: vector<int> lexicalOrder(int n) { vector<int> ans; ; ; i <= n; ++i) { ans.push_back(cu…

给定一个整数 n, 返回从 1 到 n 的字典顺序.例如,给定 n =1 3,返回 [1,10,11,12,13,2,3,4,5,6,7,8,9] .请尽可能的优化算法的时间复杂度和空间复杂度. 输入的数据 n 小于等于 5,000,000.详见:https://leetcode.com/problems/lexicographical-numbers/description/ C++: class Solution { public: vector<int> lexicalOrder(int…

返回本章节 返回作业目录 需求说明: 编写Java程序,输出1-100之间能够同时被3和4整除的最大的五个数字. 实现思路: 声明变量count,用于存储满足条件的数据个数,设置初始值为0. 在区间1-100查找满足条件的数据,需要对每个数字进行逐一判断,可使用循环结构实现. 实现代码: import java.util.Scanner; public class FindMaxFiveDemo { public static void main(String[] args) { System.…

本题要求输出2到n之间的全部素数,每行输出10个.素数就是只能被1和自身整除的正整数.注意:1不是素数,2是素数. 输入格式: 输入在一行中给出一个长整型范围内的整数. 输出格式: 输出素数,每个数占6位,每行输出10个.如果最后一行输出的素数个数不到10个,也需要换行. 输入样例: 10 结尾无空行 输出样例: 2 3 5 7 结尾无空行 answer #include <stdio.h> #include <math.h> int prime(int n) { int i,fl…

[129-Sum Root to Leaf Numbers(全部根到叶子结点组组成的数字相加)] [LeetCode-面试算法经典-Java实现][全部题目文件夹索引] 原题 Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number. An example is the root-to-leaf path 1->2->3 which represent…

1. 我们找到这么一个点,也是输入和输出都未过滤的一个点.相比教程第一例,其特殊之处在于,是输出在了 <script>[输出]</script>之间. http://activity.soso.com/common/setParentsInfo.php?callback=aaaaaaaaa 如下图:callback参数未做过滤. 在[查看源代码]下,我们可以看到. 缺陷网页源代码: <script type='text/javascript'>document.doma…

#include <stdio.h> #include <math.h> //判断 101-200 之间有多少个素数,并输出所有素数. int main(void) { , e = ; ; //素数总个数. int i; int sq; //对每个数开方. for(i = s; i <= e; i++) { ; //标识当前数是否为素数,素数为1,0为非素数. sq = (int)sqrt((float)i); ; j <= sq; j++) { ) { //非素数.…

Given an integer n, return 1 - n in lexicographical order. For example, given 13, return: [1,10,11,12,13,2,3,4,5,6,7,8,9]. Please optimize your algorithm to use less time and space. The input size may be as large as 5,000,000. 这道题给了我们一个整数n,让我们把区间[1,n…

Given an integer n, return 1 - n in lexicographical order. For example, given 13, return: [1,10,11,12,13,2,3,4,5,6,7,8,9]. Please optimize your algorithm to use less time and space. The input size may be as large as 5,000,000. Solution 1: If we look…

Given an integer n, return 1 - n in lexicographical order. For example, given 13, return: [1,10,11,12,13,2,3,4,5,6,7,8,9]. Please optimize your algorithm to use less time and space. The input size may be as large as 5,000,000. 方法1: 利用排序,把数字按照lexicogr…

Given an integer n, return 1 - n in lexicographical order. For example, given 13, return: [1,10,11,12,13,2,3,4,5,6,7,8,9]. Please optimize your algorithm to use less time and space. The input size may be as large as 5,000,000. 给定一个整数 n, 返回从 1 到 n 的字典…

问题描述 Given an integer n, return 1 - n in lexicographical order. For example, given 13, return: [1,10,11,12,13,2,3,4,5,6,7,8,9]. Please optimize your algorithm to use less time and space. The input size may be as large as 5,000,000. Java算法实现 public cl…

这个代码我整体写的比较简单,读者可以简单参考一下,对人家题目要求略微修改了一下,多加了一个“置空”按钮.下图为我设计的界面 运行程序后的截图请看我后面的截图: package com.wangshilin.study.app_127; import java.awt.EventQueue; import javax.swing.JFrame;import javax.swing.JTextField;import javax.swing.JButton;import javax.swing.JL…

http://www.tuicool.com/articles/qaaA3i   TODO…

from datetime import date f_date = date(, , ) l_date = date(, , ) delta = l_date - f_date print(delta.days)…

#include <stdio.h> int isPrime(unsigned int n)//定义素数函数 { int i; || n == ) ; ; i * i <= n; i++) { ) ; } ; } int main(void)//主函数 { ; ; i <= ; i++) { if(isPrime(i)) { printf("%5d",i); count++; ==)//满五个换行 printf("\n"); } } prin…

This article gives you all the information you need in order to begin working with numbers in your PL/SQL programs. Numbers in PL/SQL PL/SQL offers a variety of numeric datatypes to suit different purposes: NUMBER. A true decimal datatype that is ide…

9.6 About string,"I am a teacher",这个字符串中有多少个字,且分别把每个字打印出来. /*本题的思路就是,当我有一个字符串,我需要一个一个字符的处理,当下一个字符是个空格的时候,我就知道前面已 经构成了一个完整的字,把它输出出来就好了.如果发现下一个字符不是一个空格的话,我就把这个字符,加到另一个字符串中,逐渐积累那个字符串成为一个完整 的字.*/ public class Test {     static int amount_space = 0;…

代码: package bao; import java.util.Random; public class a { public static void main(String[] args) { int s=0,n=0; Random d=new Random(); int x=(d.nextInt(10))+1; //x为随机数 System.out.println("随机数="+x); for(int i=0;i<=x;i++) { //10的i次方 int m=(int…

I Given a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level). For example:Given binary tree{3,9,20,#,#,15,7}, 3 / \ 9 20 / \ 15 7 return its level order traversal as: [ [3], [9,20], [15,7] ] c…

题目描述 给定n个数字的数组,里面的值都是1-n,但是有的出现了两遍,因此有的没有出现,求没有出现值这个数组中的值有哪些. 要求不能用额外的空间(除了返回列表之外),时间复杂度n 思路 因为不能用额外空间并且时间是O(n),所以不能用排序或者hash 通过在对应位置的值去确定下一个位置,一直到遍历完.其实自己也没有很成熟的思想. 比如对于[4,3,2,7,8,2,3,1]: A[0],4=>找到a[3],7=>a[6],3=>a[2]====注意有可能出现循环,行不通. 本来以为行不通,…

源代码地址:https://github.com/hopebo/hopelee 语言:C++ 301. Remove Invalid Parentheses Remove the minimum number of invalid parentheses in order to make the input string valid. Return all possible results. Note: The input string may contain letters other tha…

刷题备忘录,for bug-free leetcode 396. Rotate Function 题意: Given an array of integers A and let n to be its length. Assume Bk to be an array obtained by rotating the array A k positions clock-wise, we define a "rotation function" F on A as follow: F(k…

刷题备忘录,for bug-free 招行面试题--求无序数组最长连续序列的长度,这里连续指的是值连续--间隔为1,并不是数值的位置连续 问题: 给出一个未排序的整数数组,找出最长的连续元素序列的长度. 如: 给出[100, 4, 200, 1, 3, 2], 最长的连续元素序列是[1, 2, 3, 4].返回它的长度:4. 你的算法必须有O(n)的时间复杂度 . 解法: 初始思路 要找连续的元素,第一反应一般是先把数组排序.但悲剧的是题目中明确要求了O(n)的时间复杂度,要做一次排序,是不能达…

终于将LeetCode的免费题刷完了,真是漫长的第一遍啊,估计很多题都忘的差不多了,这次开个题目汇总贴,并附上每道题目的解题连接,方便之后查阅吧~ 477 Total Hamming Distance 44.10% Meidum 475 Heaters  30.20% Easy 474 Ones and Zeroes  34.90% Meidum 473 Matchsticks to Square  31.80% Medium 472 Concatenated Words 29.20% Hard…

169. Majority Element Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2 ⌋ times. You may assume that the array is non-empty and the majority element always exist in the array. Credit…