Ping World

Map the world!

LeetCode: Best Time to Buy and Sell Stock

"Algorithms"

Description Say you have an array for which the ith element is the price of a given stock on day i. If you were only permitted to complete at most one transaction (i.e., buy one and sell one share...

Posted by Ping on April 9, 2020

LeetCode: Maximum Subarray

"Algorithms"

Description Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum. Example: Input: [-2,1,-3,4,-1,2,1,-5,4], Outpu...

Posted by Ping on April 7, 2020

Run shadowsocks with Docker

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Ubuntu 16.01 Minimal environment Install the latest docker version Steps here Pull shadowsocks image and run 1 2 3 4 5 6 7 docker pull oddrationale/docker-shadowsocks # wit...

Posted by Ping on January 15, 2020

Lodes_map

LODES home work remain Population 70,070 13,065 6,277 2,663 1,246 632 308 124

Posted by Ping World on January 3, 2020

Book 《Clean Code》 Notes

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Chapter 3: Functions Functions should DO ONE THING. They should do it WELL. They should do it ONLY.

Posted by Ping on June 30, 2019

Codility

"Algorithms"

1 %config IPCompleter.greedy=True Merge sort Sort an array. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 def split_sort(A): if len(A) <= 1: return A...

Posted by Ping on June 15, 2019

Places i have been

Places I Have Been

Posted by Ping World on May 2, 2019

Python Tricks

"Good to know"

Sort a Python dictionary by value Making use of the sorted() function, pass in a callable function/object to the key parameter to make comparison. Using Lambda specify the value (index 1) 1 2 d = ...

Posted by Ping on April 18, 2019

PostgreSQL and PostGIS

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PostGIS is an extensional enabling the spatial object and analysis support for PostgreSQL databse. Question Produce a list of facilities with a total revenue less than 1000. Produce an outpu...

Posted by Ping on April 12, 2019

AWS: Self Learning

"Essential Training"

Most resources in this post are from Lynda.com AWS Essential Training. Design for Failures Virtual servers EC2 Elastic IP: no instance specific/Acount level/Easily remapped from instan...

Posted by Ping on April 9, 2019

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