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From Java to Golang, What Have I learned From few years ago, Java has always been my go-to language for backend development. I have been using Java for developing logic applications, and even Android applications.

Leetcode Notes 2507 - Smallest Value After Replacing With Sum of Prime Factors class Solution { public: int pf (int n) { int p = n; int out = 0; while (p % 2 == 0) { // p /= 2; out += 2 ; } int sqt = sqrt(p); for (int i =3 ;i<=sqt ;i+=2) { while (p%i == 0) { p = p/i; out += i; } } if (p>2) { out = out+p; } return out; } int smallestValue(int n) { int p = n; while (1) { int a = pf (p) ; std::cout<< "Output: "<< a <<std::endl; if (a == p){ return p; } else { p=a; } } } /** => 15 => 3 * 5 => 8 => 2 * 2 * 2 => 6 => 2 * 3 => 5 (is_prime ).

Single Threaded One Billion Rows Challenge This is a solution to the one billion rows challenge using a single thread in C++. Not optimized at all, but still faster than most multi-threaded solutions.

Secure Computer Systems Final Project This project is to implement a protection mechanism against the Prime+Probe attack. There are two parts to this project. First is the show-case of attempted Prime+Probe attack on a x86_64 Linux system with/without the protection in place.

Photos I took with film cameras.

Monospaced Page Exam 2 notes Name: Yi Yang AndrewID: yiyang5 Example In a experiment in changing one’s fate and causality, an observational study is conducted on people who have read Berserk.

Review 3 Exam Market power and Price discrimination First degree price discrimination Selling at each customer’s individual reservation price (at each customer’s maximum willlingness to pay price). producer must identify each customer’s “type”

Monospaced Page Causal Inference Specific causal question (SCQ) SCQ four componentsintervention ("what is the impact of xxx", x)event & purpose ("of xxx", x improves y )who ("for xxx", group_A, a group )alternative or the control ("

Rules of Engagement It is a legally binding outline of the client’s objective and scope. NDAs can also be used. Section Detail Executive Summary Summary of the contents and authorization within Purpose Why the RoE is used Reference References used Scope Agreed upon restrictions and guidelines Definitions Technical terms used Rules of Engagement and Support Agreement Defines the obligations and technical expectation Provisions Define exceptions and additional info.

Penetration Tests Scan every host. Exploit the vulnerability. Post-exploit, extract info, pivot to gain more access to other hosts. Identify and Protect, then see what impact an attacker has. Advanced Persistent Threats(APT), Regular pen not enough Pen Tests are: