Merge Interval leetcode java

题目: Given 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]. 题解: 这道题主要难点是改写Comparator. Comparator接口定义了两个方法:compare( )和equals( ).这里给出的compare( )方法按顺序比较了两个元素: int comp…

Insert Interval leetcode java

题目: Given a set of non-overlapping intervals, insert a new interval into the intervals (merge if necessary). You may assume that the intervals were initially sorted according to their start times. Example 1: Given intervals [1,3],[6,9], insert and me…

leetcode 57 Insert Interval & leetcode 1046 Last Stone Weight & leetcode 1047 Remove All Adjacent Duplicates in String & leetcode 56 Merge Interval

lc57 Insert Interval 仔细分析题目,发现我们只需要处理那些与插入interval重叠的interval即可,换句话说,那些end早于插入start以及start晚于插入end的interval都可以保留.我们只需要两个指针,i&j分别保存重叠interval中最早start和最晚end即可,然后将interval [i, j]插入即可 class Solution { public int[][] insert(int[][] intervals, int[] newInte…

Merge Intervals - LeetCode

目录题目链接注意点解法小结题目链接 Merge Intervals - LeetCode 注意点区间是无序的每个区间start一定小于end 解法解法一:首先以start的值从小到大来排序,排完序我们就可以开始合并了.先把第一个区间存入ret,然后从第二个开始遍历所有区间,如果与ret中最后一个区间有重叠就更新,否则就直接存入ret.时间复杂度O(n) /** * Definition for an interval. * struct Interval { * int star…

56. Merge Interval

56. Merge Interval 0. 参考文献序号文献 1 花花酱 LeetCode 56. Merge Intervals 2 [LeetCode] Merge Intervals 合并区间 1. 题目 Given a collection of intervals, merge all overlapping intervals. Example 1: Input: [[1,3],[2,6],[8,10],[15,18]] Output: [[1,6],[8,10],[15,18]…

N-Queens II leetcode java

题目: Follow up for N-Queens problem. Now, instead outputting board configurations, return the total number of distinct solutions. 题解: 这道题跟NQueens的解法完全一样(具体解法参照N QueensN Queens leetcode java),只不过要求的返回值不同了..所以要记录的result稍微改一下就好了... 因为涉及到递归,result传进去引用类型(…

LintCode 156: Merge Interval

LintCode 156: Merge Interval 题目描述给出若干闭合区间,合并所有重叠的部分. 样例给出的区间列表 => 合并后的区间列表: [ [ [1, 3], [1, 6], [2, 6], => [8, 10], [8, 10], [15, 18] [15, 18] ] ] Fri Feb 24 2017 思路首先将区间们按照开始元素的大小排序,然后从头到尾遍历一遍,若遇到该区间的开始元素小于前一个区间的结束元素时,将两个区间合并. 区间合并可以直接修改前一个区间的结束…

间隔问题，合并间隔(merge interval)，插入间隔(insert interval)

Merge Interval: Given 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]. 算法分析:首先要对给定序列排序.然后再去遍历合并. class Interval { int start; int end; Interval() { start = 0; end = 0…

[LeetCode] Merge Interval系列，题：Insert Interval，Merge Intervals

Interval的合并时比较常见的一类题目,网上的Amazon面经上也有面试这道题的记录.这里以LeetCode上的例题做练习. Merge Intervals Given 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]. /** * Definition for an inter…

[Leetcode][JAVA] Insert Interval

Given a set of non-overlapping intervals, insert a new interval into the intervals (merge if necessary). You may assume that the intervals were initially sorted according to their start times. Example 1:Given intervals [1,3],[6,9], insert and merge […

LeetCode - Merge Interval.

Merge Intervals 2014.2.26 21:28 Given 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: The problem didn't guarantee that the set of intervals is sorted, so…

Merge k Sorted Lists Leetcode Java

Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 使用分治法,时间复杂度是nlogk, n是所有元素个数的总和,k是k个lists, 这种方法和依次merge每一个list的方法的时间复杂度不同. 如果第一个list有n-k个元素,其余每个list是1个元素, 两两分治合并,每个元素参与了logk次合并, 如果是依次合并(第一个和第二个合并,之后的结…

Merge K Sorted List（含Merge Two Sorted LIst） leetcode java

问题描述: Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 分析: 将k个sorted list合并为一个sorted list借鉴归并排序的方法,自顶向下,先递归地对链表的前半部分和后半部分进行归并排序,最后再merge. 二分时,mid = (len - 1)/ 2,这样划分更为均匀,而不是 len / 2 算法: /** * 方法一.Link…

Merge Sorted Array leetcode java（回顾MergeTwoArray和MergeTwoLinkedList）

题目: Given two sorted integer arrays A and B, merge B into A as one sorted array. Note: You may assume that A has enough space (size that is greater or equal to m + n) to hold additional elements from B. The number of elements initialized in A and B a…

Merge Two Sorted Lists leetcode java

题目: Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists. 题解: 这道题是链表操作题,题解方法很直观. 首先,进行边界条件判断,如果任一一个表是空表,就返回另外一个表. 然后,对于新表选取第一个node,选择两个表表头最小的那个作为新表表头,指针后挪. 然后同时遍历…

56. Merge Intervals - LeetCode

Question 56. Merge Intervals Solution 题目大意: 一个坐标轴,给你n个范围,把重叠的范围合并,返回合并后的坐标对思路: 先排序,再遍历判断下一个开始是否在上一个范围内,如果在且结束坐标大于上一个坐标就合并 Java实现: public List<Interval> merge(List<Interval> intervals) { if (intervals == null || intervals.size() == 0) return i…

Merge Intervals——LeetCode

Given 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]. 题目大意:给定一个组区间,实现一个函数,合并这些区间. 解题思路:首先根据start排序,然后开始循环,判断当前end和下一个的start是否有overlap,没有的话,可以输出当前这个区间,有的话把后一个的end设置为…

【目录】LeetCode Java实现

这里记录一下自己刷的LeetCode题目. 有些博客用英文阐述自己的思路和收获,相当于练习一下英文的表达能力. 比较好的题目有加粗. 1. Two Sum 3. Longest Substring Without Repeating Characters 5. Longest Palindromic Substring 7. Reverse Integer 9. Palindrome Number 8. String to Integer (atoi) 溢出的处理 21. Merge Two S…

Regular Expression Matching leetcode java

题目: Implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches zero or more of the preceding element. The matching should cover the entire input string (not partial). The function prototype shoul…

Sqrt(int x) leetcode java

Reference: http://blog.csdn.net/lbyxiafei/article/details/9375735 题目: Implement int sqrt(int x). Compute and return the square root of x. 题解: 这道题很巧妙的运用了二分查找法的特性,有序,查找pos(在这道题中pos=value),找到返回pos,找不到返回邻近值. 因为是求数x(x>=0) 的平方根, 因此,结果一定是小于等于x且大于等于0,所以用二分查…

ZigZag Conversion leetcode java

题目: The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility) P A H N A P L S I I G Y I R And then read line by line: "PAHNAP…

[LeetCode][Java]Candy@LeetCode

Candy There are N children standing in a line. Each child is assigned a rating value. You are giving candies to these children subjected to the following requirements: Each child must have at least one candy. Children with a higher rating get more ca…

[Leetcode][JAVA] Valid Palindrome

Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. For example,"A man, a plan, a canal: Panama" is a palindrome."race a car" is not a palindrome. Note:Have you consider that th…

Single Number II leetcode java

问题描述: 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? 提示:bit manipulation(位操作) 参考:http…