XpandNotes

exploring the intersection of technology and creativity

Leetcode #96 Unique Binary Search Trees

Description Given an integer n, return the number of structurally unique BST’s (binary search trees) which has exactly n nodes of unique values from 1 to n. Example 1: Input: n = 3 Output: 5 ...

Posted by arthurchang09 on February 23, 2021

Leetcode #5 Longest Palindromic Substring

Description Given a string s, return the longest palindromic substring in s. Example 1: Input: s = "babad" Output: "bab" Note: "aba" is also a valid answer. Example 2: Input: s = "cbbd" Outpu...

Posted by blueskyson on February 23, 2021

旅遊主頁

2021 2021 林口櫻花星巴克照片 2023 2023 北海道：十勝之丘公園 2023 北海道：十勝池田酒廠、釧路丹頂鶴自然公園、釧路溼原、阿寒湖 2023 北海道：摩周湖、屈斜路湖、鄂霍次克流冰館、北見狐狸村、層雲峽 2024 參加 IEEE ICBC 2024 都柏林遊記

Posted by blueskyson on February 18, 2021

林口櫻花星巴克

分享一些照片，拍攝時間: 2021-02-06 星巴克正門從裡面看出去的樣子

Posted by blueskyson on February 18, 2021

Cooler Master CK550 紅軸鍵盤開箱

因為筆電的鍵盤不好按，而且敲筆電的鍵盤時常常不知不覺駝背，眼睛又離螢幕很近，所以就想購入一把機械鍵盤。一開始的目標就是想購入下手不用太用力的鍵盤，因為青軸實在太吵，吵到感覺我會被自己敲鍵盤的聲音煩死，而茶軸和黑軸需要按壓較大力，怕小指常常按 ctrl 、 enter 、 home 、 end 會酸，因此紅軸最符合需求。逛了各個電子用品店後，發現大多只有青軸的現貨，最後找到這款 CK5...

Posted by blueskyson on February 18, 2021

Leetcode #4 Median of Two Sorted Arrays

Description Given two sorted arrays nums1 and nums2 of size m and n respectively, return the median of the two sorted arrays. Follow up: The overall run time complexity should be O(log (m+n)). E...

Posted by blueskyson on February 16, 2021

Leetcode #3 Longest Substring Without Repeating Characters

Description Given a string s, find the length of the longest substring without repeating characters. Example 1: Input: s = "abcabcbb" Output: 3 Explanation: The answer is "abc", with the length ...

Posted by blueskyson on February 14, 2021

Leetcode #2 Add Two Numbers

Description You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order, and each of their nodes contains a single digit. Add the two nu...

Posted by blueskyson on February 12, 2021

Leetcode #1 Two Sum

Description Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. You may assume that each input would have exactly one solutio...

Posted by blueskyson on February 7, 2021

肺炎疫情 (COVID-19) 到 2020 年 12 月的現狀 (自 Kaggle Notebook 翻譯)

來源: https://www.kaggle.com/corochann/covid-19-current-situation-on-december/notebook 此筆記的資料集來源: Johns Hopkins University github repository 最後更新: 2021-02-01 主要重點綜觀全球疫情走勢以折線圖分析 ...

Posted by blueskyson on January 29, 2021