【139-Word Break(单词拆分)】【LeetCode-面试算法经典-Java实现】【全部题目文件夹索引】原题 Given a string s and a dictionary of words dict, determine if s can be segmented into a space-separated sequence of one or more dictionary words. For example, given s = "leetcode", dict = ["leet", "code"]. Return true because "leetcode" can be segmented as "leet code". 题目大意 给定一个字符串s和单词字典...
【059-Spiral Matrix II(螺旋矩阵II)】【LeetCode-面试算法经典-Java实现】【全部题目文件夹索引】原题 Given an integer n, generate a square matrix filled with elements from 1 to n2 in spiral order. For example, Given n = 3, You should return the following matrix:[[ 1, 2, 3 ],[ 8, 9, 4 ],[ 7, 6, 5 ]
]题目大意 给定一个整数n。生成一个n*n的矩阵,用1-n^2的数字进行螺旋填充。解题思路 採用计算生成法...
【151-Evaluate Reverse Polish Notation(计算逆波兰式)】【LeetCode-面试算法经典-Java实现】【所有题目目录索引】原题 Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are +, -, *, /. Each operand may be an integer or another expression. Some examples: ["2", "1", "+", "3", "*"] ->((2 + 1) * 3) ->9["4", "13", "5", "/", "+"] ->(4 + (13 / 5)) ->6题目大意 ...
【137-Single Number II(只出现一次的数字II)】【LeetCode-面试算法经典-Java实现】【所有题目目录索引】原题 Given an array of integers, every element appears three times except for one. Find that single one. Note: Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory? 题目大意 给一个数组,里面只有一个数字一次,其它数字都出现3次,找出这个出现一...
【082-Remove Duplicates from Sorted List II(排序链表中删除重复元素II)】【LeetCode-面试算法经典-Java实现】【所有题目目录索引】原题 Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list. For example, Given 1->2->3->3->4->4->5, return 1->2->5. Given 1->1->1->2->3, return 2->3. 题目大意 给定一个排好序的单链表,删除所有重复...
【113-Path Sum II(路径和II)】【LeetCode-面试算法经典-Java实现】【所有题目目录索引】原题 Given a binary tree and a sum, find all root-to-leaf paths where each path’s sum equals the given sum. For example: Given the below binary tree and sum = 22, 5/ 4 8/ / 11 13 4/ \ / 7 2 5 1 return[[5,4,11,2],[5,8,4,5]
]题目大意 给定一棵二叉树...
【033-Search in Rotated Sorted Array(在旋转数组中搜索)】【LeetCode-面试算法经典-Java实现】【所有题目目录索引】原题 Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2). You are given a target value to search. If found in the array return its index, otherwise return -1. You may assume no duplicate exists in the array. 题目大...
【058-Length of Last Word (最后一个单词的长度)】【LeetCode-面试算法经典-Java实现】【所有题目目录索引】原题 Given a string s consists of upper/lower-case alphabets and empty space characters ‘ ‘, return the length of last word in the string. If the last word does not exist, return 0. Note: A word is defined as a character sequence consists of non-space characters only. For example, Given s ...
#include <assert.h>#include <string.h>#include <stack> ////////////////////////////////////////////////////////////////////////// // C++ 经典面试算法题 //1.实现strcpy. char* MyStrCpy( char *pDest, const char *pSrc ) { if( nullptr == pDest || nullptr == pSrc ) { return nullptr; } if( pDest == pSrc ) { return pDest; } char *pIter = pDest; ...
【030-Substring with Concatenation of All Words(串联全部单词的子串)】【LeetCode-面试算法经典-Java实现】【全部题目文件夹索引】原题 You are given a string, s, and a list of words, words, that are all of the same length. Find all starting indices of substring(s) in s that is a concatenation of each word in words exactly once and without any intervening characters. For example, given: s: "barfoot...
话说工作中算法用的真的多么??????虽然工作中用不到,但是你总得换工作吧,防不住笔试面试中问你些这么个玩意。而且,多思考,有助于活跃头脑了。深深扎入项目中童鞋们还可以活跃活跃,防止生锈。话不多说,题目如下:题目:输入一个英文句子,翻转句子中单词的顺序,但单词内字符的顺序不变。句子中单词以空格符隔开。为简单起见,标点符号和普通字母一样处理。例如输入“I am a student.”,则输出“student. a am I”。在...
想见识一下,如果能再否附上一些优雅的解决方案是极好的回复内容:想见识一下,如果能再否附上一些优雅的解决方案是极好的LeetCode
小建议:不要看它给的难度,直接从通过率高的往通过率低的刷。
一天两题,一年就能刷完,就看你能不能坚持下来。编程珠玑,这本书值得一看还有算法,这本也可以大概看看另外,算法题选经典的看,不然太消耗时间了。
想见识一下,如果能再否附上一些优雅的解决方案是极好的
AI的兴起,使得大家对算法的关注也越来越高。而作为一个前端工程师,算法很多时候是我们的弱点,本文译自国外一篇面试题。列出了一些简单算是跟算法相关的面试题素数Q:你将如何验证一个素数?A:一个素数只能被它自己和1整除。所以,我将运行一个while循环并加1。(看代码示例,如果你无法理解,那这不是你的菜。先回去学习javaScript基础知识然后再回来吧。)方法1function isPrime(n){var pisor = 2;while (n > pisor){if(n % p...
问题描述
全排列:给定元素序列,如{1,2,3},他们所有可能的排列组合有{1,2,3}、{1,3,2}、{2,1,3}、{2,3,1}、{3,1,2}、{3,2,1}
思路
关于递归:
假设给定元素序列是{1,2,3,4},则在改变第一个元素的情况下,我们共有四种选择,{1,2,3,4}、{2,1,3,4}、{3,2,1,4}、{4,2,3,1},而这四种选择分别对应着原始序列的第一个元素与后面的元素进行交换。注意到此时我们已经取遍了第一个元素不同的所有情况。确定...