Maximal RectangleGiven a 2D binary matrix filled with 0's and 1's, find the largest rectangle containing all ones and return its area. Show TagsHave you met this question in a real interview? Yes  NoDiscussSOLUTION 1: public class Solution { public i…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址: https://leetcode.com/problems/maximal-rectangle/description/ 题目描述: Given a 2D binary matrix filled with 0's and 1's, find the largest rectangle containing only 1's and return its area. Exa…

作者:jostree 转载请注明出处 http://www.cnblogs.com/jostree/p/4052721.html 题目链接:leetcode Maximal Rectangle 单调栈 该题目是  leetcode Largest Rectangle in Histogram 的二维版本,首先进行预处理,把一个n×m的矩阵化为n个直方图,然后在每个直方图中计算使用单调栈的方法计算面积最大的矩形,然后求得最大的矩形面积即可. Ps:这题直接在网页里面敲完居然1A,不错. 代码如下:…

Combination Sum Combination Sum Total Accepted: 25850 Total Submissions: 96391 My Submissions Question Solution Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. The…

全排列问题.经常使用的排列生成算法有序数法.字典序法.换位法(Johnson(Johnson-Trotter).轮转法以及Shift cursor cursor* (Gao & Wang)法. [题目] Given a collection of numbers, return all possible permutations. For example, [1,2,3] have the following permutations: [1,2,3], [1,3,2], [2,1,3], [2…

以前从来没有写过解题报告,只是看到大肥羊河delta写过不少.最近想把写博客的节奏给带起来,所以就挑一个比较容易的题目练练手. 原题链接 https://leetcode.com/problems/course-schedule/ 题目大意 有n个课程,编号分别是0到n-1.我们的目标是修完所有课程.然而有些课程有前置课程的,我们必须修完前置课程才能修该门课程.题目给了我们课程之间的前置关系,让我们判断是否能修完所有课程. 题目原型 这个题目的描述简单粗暴,我们不难发现,其实是给了我们一个有向图…

Sort ColorsGiven an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, white and blue. Here, we will use the integers 0, 1, and 2 to represent the color red, wh…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 确定对角线,找另外两点(4sum) 字典保存出现的x值,y值的点 日期 题目地址:https://leetcode.com/problems/minimum-area-rectangle/description/ 题目描述 Given a set of points in the xy-plane, determine the minimum are…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 Java解法 python解法 日期 题目地址:https://leetcode.com/problems/construct-the-rectangle/#/description 题目描述 For a web developer, it is very important to know how to design a web page's si…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 动态规划 日期 题目地址: https://leetcode.com/problems/maximal-square/description/ 题目描述 Given a 2D binary matrix filled with 0's and 1's, find the largest square containing only 1's and r…

Given a 2D binary matrix filled with 0's and 1's, find the largest rectangle containing all ones and return its area. 此题是之前那道的Largest Rectangle in Histogram 直方图中最大的矩形 的扩展,这道题的二维矩阵每一层向上都可以看做一个直方图,输入矩阵有多少行,就可以形成多少个直方图,对每个直方图都调用Largest Rectangle in Hist…

原题地址:https://oj.leetcode.com/problems/maximal-rectangle/ 题意:Given a 2D binary matrix filled with 0's and 1's, find the largest rectangle containing all ones and return its area. 解题思路:找出矩阵中最大的矩形,矩形中只包含1.这道题需要利用上一道题(Largest Rectangle in Histogram)的结论.比…

Given a 2D binary matrix filled with 0's and 1's, find the largest rectangle containing all ones and return its area. [解题思路] 1.brute force 枚举所有sub-matrix(O(N^2), N = m*n) ,检查每个子矩阵是不是都是1,如果是更新最大面积,检查子矩阵是否都是1需要 花费O(N). 故总的时间为O(N^3) N = m*n 可以过小数据,大数据直接…

Given a 2D binary matrix filled with 0's and 1's, find the largest rectangle containing all ones and return its area. 在做Largest Rectangle in Histogram的时候有人说可以用在这题,看了一下还真是,以每行为x轴,每列往上累计的连续的1当成高度,就可以完全使用一样的方法了. int largestArea(vector<int>height){ stac…

Given a 2D binary matrix filled with 0's and 1's, find the largest rectangle containing all ones and return its area. 参考“Largest Rectangle in Histogram”这个题的解法,思想差不多一样,只是用h向量表示Rectangle中此元素中第一行到本行的高度,非常妙的算法: class Solution { public: int maximalRectang…

Permutation Sequence https://oj.leetcode.com/problems/permutation-sequence/ The set [1,2,3,…,n] contains a total of n! unique permutations. By listing and labeling all of the permutations in order, We get the following sequence (ie, for n = 3): "123&…

Interleaving StringGiven s1, s2, s3, find whether s3 is formed by the interleaving of s1 and s2. For example,Given:s1 = "aabcc",s2 = "dbbca", When s3 = "aadbbcbcac", return true.When s3 = "aadbbbaccc", return false.…

Scramble String Given a string s1, we may represent it as a binary tree by partitioning it to two non-empty substrings recursively. Below is one possible representation of s1 = "great": great / \ gr eat / \ / \ g r e at / \ a t To scramble the s…

Gas Station There are N gas stations along a circular route, where the amount of gas at station i is gas[i]. You have a car with an unlimited gas tank and it costs cost[i] of gas to travel from station i to its next station (i+1). You begin the journ…

Given a string s, partition s such that every substring of the partition is a palindrome. Return all possible palindrome partitioning of s. For example, given s = "aab",Return [    ["aa","b"],    ["a","a",…

Sort List Sort a linked list in O(n log n) time using constant space complexity. 使用Merge Sort, 空间复杂度是 O(logN) 因为使用了栈空间. SOLUTION 1: 使用Merge Sort来解决问题. 为什么不用QuickSort? 因为随机访问对于链表而言太耗时,而heap sort不可行. 注意,Find Mid用了2种解法.或者是让Fast提前结束,或是让Fast先走一步,目的就是要取得中间…

Wildcard MatchingImplement wildcard pattern matching with support for '?' and '*'. '?' Matches any single character.'*' Matches any sequence of characters (including the empty sequence). The matching should cover the entire input string (not partial)…

Merge IntervalsGiven a collection of intervals, merge all overlapping intervals. For example,Given [1,3],[2,6],[8,10],[15,18],return [1,6],[8,10],[15,18]. SOLUTION 1: 1. 先使用Comparator 的匿名类对intervels进行排序. 2. 把Intervals遍历一次,依次一个一个merge到第1个interval. 把第1…

A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below). The robot can only move either down or right at any point in time. The robot is trying to reach the bottom-right corner of the grid (marked 'Finish' in t…

orz PoPoQQQ 的神题. 我的想法是:给每一个高度都维护一个 $01$ 序列,大概就是维护一个 $Map[i][j]$ 的矩阵,然后 $Map[i][j]$ 表示第 $i$ 根柱子的高度是否 $\ge j$. 那么怎么维护 $Map[i][j]$ 呢..? 首先我们把柱子按照高度从小到大排序,然后依次给每个高度建主席树,初始时 $Map[i][0]$ 全是 $1$,然后如果当前高度 $i$ 比某个柱子 $j$ 的高度要大了,那么就单点修改 $Map[i][j]$,然后这个就是主席树动态开…

[题目] Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array which gives the sum of target. Note: Elements in a quadruplet (a,b,c,d) must be in non-descending o…

Largest Number Given a list of non negative integers, arrange them such that they form the largest number. For example, given [3, 30, 34, 5, 9], the largest formed number is 9534330. Note: The result may be very large, so you need to return a string…

Next Permutation Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such arrangement is not possible, it must rearrange it as the lowest possible order (ie, sorted in ascending orde…

Valid Parentheses Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]" a…

Sqrt(x) Implement int sqrt(int x). Compute and return the square root of x. SOLUTION 1: 参见:二分法总结,以及模板:http://t.cn/RZGkPQc public class Solution { public int sqrt(int x) { if (x == 1 || x == 0) { return x; } int left = 1; int right = x; while (left <…