原创 LeetCode題解：Construct the Rectangle
For a web developer, it is very important to know how to design a web page's size. So, given a specific rectangular we
2020-06-07 17:27:17
原创 LeetCode題解：3Sum
3Sum 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
2020-02-21 17:33:31
原创 LeetCode題解：Merge/Insert Interval
Merge Intervals Given a collection of intervals, merge all overlapping intervals. For example, Given [1,3],[2,6],[8,1
2020-02-21 17:33:31
原创 LeetCode題解：Divide Two Integers
Divide Two Integers Divide two integers without using multiplication, division and mod operator. 思路： 核心思想是：令試除數等於除數，
2020-02-21 17:33:31
原创 LeetCode題解： Valid Number
Valid Number Validate if a given string is numeric. Some examples:"0" => true" 0.1 " => true"abc" => false"1 a" => fa
2020-02-21 17:33:31
原创 LeetCode題解：LRU Cache
LRU Cache Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following
2020-02-21 17:33:31
原创 LeetCode題解：Implement strStr()
Implement strStr() Implement strStr(). Returns a pointer to the first occurrence of needle in haystack, or null if ne
2020-02-21 17:33:31
原创 LeetCode題解：Evaluate Reverse Polish Notation
Evaluate Reverse Polish Notation Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid op
2020-02-21 17:33:31
原创 LeetCode題解：Search in Rotated Sorted Array
Search in Rotated Sorted Array Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i.e., 0 1
2020-02-21 17:33:30
原创 LeetCode題解：Sqrt(x)
Sqrt(x) Implement int sqrt(int x). Compute and return the square root of x. 思路： 可以考慮二分搜索，但是二分搜索的起點不好判定，不過可以預先計算好nume
2020-02-21 17:33:30
原创 LeetCode題解：Combination Sum I and II
Combination Sum Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where
2020-02-21 17:33:30
原创 Amazon DynamoDB的模型
Amazon的DynamoDB是一個NoSQL類型的數據庫。 數據庫（Database）是由表（Table）組成的。每個表則由項（Item）組成。每一項包含任意個屬性（Attribute），但是總共大小不能超過64KB。每個屬性都是一個
2020-02-21 17:33:30
原创 LeetCode題解：Counting Bits
Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1's in t
2018-09-03 20:28:08
原创 LeetCode題解：Teemo Attacking
In LLP world, there is a hero called Teemo and his attacking can make his enemy Ashe be in poisoned condition. Now, gi
2018-09-03 20:28:08
原创 LeetCode題解：Battleships in a Board
Given an 2D board, count how many battleships are in it. The battleships are represented with 'X's, empty slots are r
2018-09-03 20:28:08