原创 LeetCode:Merge k Sorted Lists

Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity.   先建一個空頭，作爲返回鏈表的首節點

2018-09-03 06:57:24

原创 LeetCode:Pascal's Triangle

Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5, Return [ [1],

2018-09-03 06:57:21

原创 LeetCode:Interleaving String

Interleaving String Given s1, s2, s3, find whether s3 is formed by the interleaving of s1 and s2. For example, Given

2018-09-03 06:57:21

原创 LeetCode:Longest Consecutive Sequence

Given an unsorted array of integers, find the length of the longest consecutive elements sequence. For example, Given

2018-09-03 06:57:21

原创 LeetCode:Jump Game I && II

Jump Game   Given an array of non-negative integers, you are initially positioned at the first index of the array.

2018-09-03 06:57:20

原创 Java synchronized關鍵字的認識

具體實現的原理不贅述，博客很多，這裏主要總結使用方法。假設有class A和對象的兩個實例a1, a2; synchronized 用法是作爲函數修飾符或者函數內語句塊修飾符，其實兩者是相通的， publ

2018-09-03 06:57:20

原创 LeetCode:Merge Two Sorted Lists

Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes

2018-09-03 06:57:20

原创 LeetCode:Longest Palindromic Substring

Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000,

2018-09-03 06:57:20 3

原创 LeetCode:Insert Interval

Given a set of non-overlapping intervals, insert a new interval into the intervals (merge if necessary). You may assu

2018-09-03 06:57:08

原创 LeetCode:Merge Sorted Array

Given two sorted integer arrays A and B, merge B into A as one sorted array. Note: You may assume that A has enough s

2018-09-03 06:57:04 2

原创 LeetCode: Generate Parentheses

Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. For example,

2018-09-03 06:56:59

原创 LeetCode:Trapping Rain Water

Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water

2018-09-03 06:56:59

原创 LeetCode:Path Sum I &&II

Path Sum   Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the

2018-09-03 06:56:57

原创 LeetCode:Convert Sorted Array to Binary Search Tree

Given an array where elements are sorted in ascending order, convert it to a height balanced BST. 由於是有序表，直接遞歸生成。 /** *

2018-09-03 06:56:57