#好题# - 随笔分类 - Beserious

leetcode 3. Longest Substring Without Repeating Characters

摘要：Given a string, find the length of the longest substring without repeating characters. 思路：用map维护区间内各个字母的数量，然后遇到已经访问过的就进行滑动区间，来得到符合条件的区间，然后求最大区间长度。虽然时阅读全文

posted @ 2018-03-17 10:21 Beserious 阅读(121) 评论(0) 推荐(0) 编辑

leetcode 84. Largest Rectangle in Histogram

摘要：Given n non negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the hist 阅读全文

posted @ 2018-03-13 22:36 Beserious 阅读(143) 评论(0) 推荐(0) 编辑

给出先序遍历和中序遍历还原树(二叉链表)

摘要：转载注明出处：http://www.cnblogs.com/pk28/ 补充树的3中遍历方式：看下图：先序遍历序列(4,1,3,2,6,5,7) 中序遍历序列(1,2,3,4,5,6,7) 后序遍历序列(2,3,1,5,7,6,4) 观察遍历的方式，我们可以知道，一棵树的先序遍历的第一个元素是树阅读全文

posted @ 2017-11-26 17:30 Beserious 阅读(1793) 评论(0) 推荐(1) 编辑

leetcode 694. Number of Distinct Islands

摘要：Given a non empty 2D array grid of 0's and 1's, an island is a group of 1's (representing land) connected 4 directionally (horizontal or vertical.) Yo 阅读全文

posted @ 2017-10-08 11:21 Beserious 阅读(851) 评论(0) 推荐(0) 编辑

leetcode 15. 3Sum

摘要：每日一道题目，预防思维僵化 Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which giv 阅读全文

posted @ 2017-09-04 15:04 Beserious 阅读(159) 评论(0) 推荐(0) 编辑

leetcode 523. Continuous Subarray Sum

摘要：Given a list of non-negative numbers and a target integer k, write a function to check if the array has a continuous subarray of size at least 2 that 阅读全文

posted @ 2017-08-30 17:48 Beserious 阅读(328) 评论(0) 推荐(1) 编辑

leetcode 667. Beautiful Arrangement II

摘要：Given two integers n and k, you need to construct a list which contains n different positive integers ranging from 1 to n and obeys the following requ 阅读全文

posted @ 2017-08-29 16:12 Beserious 阅读(224) 评论(0) 推荐(0) 编辑

leetcode 659. Split Array into Consecutive Subsequences

摘要：You are given an integer array sorted in ascending order (may contain duplicates), you need to split them into several subsequences, where each subseq 阅读全文

posted @ 2017-08-17 21:56 Beserious 阅读(1348) 评论(0) 推荐(0) 编辑

leetcode 395. Longest Substring with At Least K Repeating Characters

摘要：Find the length of the longest substring T of a given string (consists of lowercase letters only) such that every character in T appears no less than 阅读全文

posted @ 2017-08-11 16:26 Beserious 阅读(133) 评论(0) 推荐(0) 编辑

leetcode 405. Convert a Number to Hexadecimal

摘要：Given an integer, write an algorithm to convert it to hexadecimal. For negative integer, two’s complement method is used. Note: Example 1: Example 2: 阅读全文

posted @ 2017-08-08 15:26 Beserious 阅读(153) 评论(0) 推荐(0) 编辑

leetcode 316. Remove Duplicate Letters

摘要：Given a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only once. You must make sure your 阅读全文

posted @ 2017-08-07 19:31 Beserious 阅读(200) 评论(0) 推荐(0) 编辑

leetcode 209. Minimum Size Subarray Sum

摘要：Given an array of n positive integers and a positive integer s, find the minimal length of a contiguous subarray of which the sum ≥ s. If there isn't 阅读全文

posted @ 2017-08-03 18:35 Beserious 阅读(144) 评论(0) 推荐(0) 编辑

160. Intersection of Two Linked Lists

摘要：Write a program to find the node at which the intersection of two singly linked lists begins. For example, the following two linked lists: begin to in 阅读全文

posted @ 2017-07-26 13:28 Beserious 阅读(134) 评论(0) 推荐(0) 编辑

169. Majority Element

摘要：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 阅读全文

posted @ 2017-07-26 12:14 Beserious 阅读(128) 评论(0) 推荐(0) 编辑

189. Rotate Array

摘要：Rotate an array of n elements to the right by k steps. For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] is rotated to [5,6,7,1,2,3,4]. Not 阅读全文

posted @ 2017-07-25 18:35 Beserious 阅读(103) 评论(0) 推荐(0) 编辑

172. Factorial Trailing Zeroes

摘要：Given an integer n, return the number of trailing zeroes in n!. Note: Your solution should be in logarithmic time complexity. 求n得阶层，末尾0的个数老问题了，统计2,5的阅读全文

posted @ 2017-07-25 15:21 Beserious 阅读(71) 评论(0) 推荐(0) 编辑

167. Two Sum II - Input array is sorted (二分ortwo-pointer)

摘要：Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number. The function 阅读全文

posted @ 2017-07-25 11:54 Beserious 阅读(117) 评论(0) 推荐(0) 编辑

125. Valid Palindrome

摘要：Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. For example,"A man, a plan, a canal: Pan 阅读全文

posted @ 2017-07-24 17:30 Beserious 阅读(144) 评论(0) 推荐(0) 编辑

Algorithmic Crush

摘要：evendra在9号云上看到了他的教练朝他微笑。每次教授选出Devendra单独问他一个问题，Devendra朦胧的头脑里全是他的教练和她的微笑，以至于他无法专注于其他事情。帮助他解决这个问题：给你一个长度为N的列表，列表的初始值全是0。对此列表，你要进行M次查询，输出列表种最终N个值的最大值。对阅读全文

posted @ 2017-03-15 15:47 Beserious 阅读(536) 评论(0) 推荐(0) 编辑

POJ 1852 Ants

摘要：Ants Time Limit: 1000MS Memory Limit: 30000K Total Submissions: 15617 Accepted: 6753 Description An army of ants walk on a horizontal pole of length l 阅读全文

posted @ 2016-11-06 22:20 Beserious 阅读(172) 评论(0) 推荐(0) 编辑

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