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Useful Tools I Use

1 minute read

k2pdfopt A tool, transforms pdf files to easy-read pdf in mobile device. K2pdfopt optimizes PDF/DJVU files for mobile e-readers (e.g. the Kindle) and smartph...

Math Related Things

less than 1 minute read

Relation between Density and Histrogram funcion Given , where is the density function of , and the width of each bin , we can produce histrogram function...

famous algorithm

2 minute read

Median of medians The optimal algorithm selecting kth largest element,with linear time complexity Reference: https://en.wikipedia.org/wiki/Median_of_medians

common sense

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Foot <-> Inch <-> Centimeter