leetcode算法题解(Java版)-10-全排列(递归)
一、二维数据 题目描述 You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). Follow up:Could you do this in-place? 思路 最简单的方法就是在开一个新二维数组tem,然后实行“旋转操作” 这样，不符合题意！要在同一.....
leetcode算法题解(Java版)-9-N皇后问题
一、贪心 题目描述 Find the contiguous subarray within an array (containing at least one number) which has the largest sum. For example, given the array[−2,1,−3,4,−1,2,1,−5,4],the contiguous subarray[4,−1,2,1....
leetcode算法题解(Java版)-8-动态规划+状态压缩
一、树 题目描述 Given a binary tree struct TreeLinkNode { TreeLinkNode *left; TreeLinkNode *right; TreeLinkNode *next; } Populate each next pointer to point to its next right node...
leetcode算法题解(Java版)-7-循环链表
一、循环链表 题目描述 Given a linked list, determine if it has a cycle in it. Follow up:Can you solve it without using extra space? 思路 不能用多余空间，刚开始没有考虑多个指针什么，一下子想到个歪点子：循环就是重复走，那我可以标记一下每次走过的路，如果遇到标记过的路，那说明就是有回路了....
leetcode算法题解(Java版)-6-链表,字符串
一、字符串处理 题目描述 Given an integer, convert it to a roman numeral. Input is guaranteed to be within the range from 1 to 3999. 思路 把数字转化为罗马符号，根据罗马符号的规律，可以先用map来存储一下。之后把每一位添加到所求中去。 语法点：StringBuffer是字符缓冲区，是可.....
leetcode算法题解(Java版)-5-简单模拟,字符串处理
一、简单贪心 题目描述 Given n non-negative integers a1 , a2 , ..., an , where each represents a point at coordinate (i, ai ). n vertical lines are drawn such that the two endpoints of line i is at (i, ai ) and....
leetcode算法题解(Java版)-4-动态规划(杨辉三角问题)
一、简单模拟 题目描述 Say you have an array for which the i th element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may complete as many transactions as you like ....
leetcode算法题解(Java版)-3-广搜+HashMap
一、运算符——异或"^" 题目描述 Given an array of integers, every element appears twice except for one. Find that single one. Note: Your algorithm should have a linear runtime complexity. Could you implement it w.....
leetcode算法题解(Java版)-2-最长回文子串
一、int数字反转 题目描述Reverse digits of an integer. Example1: x = 123, return 321Example2: x = -123, return -321 思路： 题目很简单，需要注意的是：int型是32位的。1000000003 反转后就超了！所以需要包装类Integer中的最大值和最小值 小技巧：为了实现反转，可以先把符号保存到flag.....
leetcode算法题解(Java版)-1-二叉树遍历
又开始刷算法题了，正好在学Java，顺便也练练Java。 题目描述 Given a binary tree, return the zigzag level order traversal of its nodes' values. (ie, from left to right, then right to left for the next level and alternate betwe....
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