Yunrui Li – Medium

Yunrui Li

Leetcode-Binary Tree Traversal

For recursion, it’s too easy. 3 BT traversals using stack(iterative way to solve it).

1 min readOct 17, 2021

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Yunrui Li

Leetcode-Combination Series

Usually, when it comes to combination problems, the most naive way to solve the problem is generate all possible solutions. And, we use…

2 min readOct 6, 2021

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Yunrui Li

Leetcode-Basic Calculator Series

Given 一個string expression, 我們要去計算result of expression.

2 min readSep 10, 2021

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Yunrui Li

How to practice LeetCode efficiently?

2021–2022刷題重點:

1 min readAug 24, 2021

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Yunrui Li

ML system design interview-Feed Based System

什麼是Feed Based Feed System? 經典的就是Tweeter’s Feed, Facebooks Timeline, IG’s story.

2 min readAug 11, 2021

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ML system design interview-Feed Based System

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Yunrui Li

ML-Evaluation Metrics

Why do you need to be familiar with evaluation metric?

1 min readAug 8, 2021

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ML-Evaluation Metrics

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Yunrui Li

Leetcode-subarray

Some pattern about continuous subarray related problem. Usually, naive solution is generate all possible subarray, which takes O(n²) times…

1 min readAug 4, 2021

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Leetcode-subarray

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Yunrui Li

ML system design interview-Recommendation System

Explicit data 在 data collection會有MNAR(非隨機缺失的問題

6 min readJul 28, 2021

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ML system design interview-Recommendation System

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Yunrui Li

ML questions

This posts focus on those ML fundamentals.

8 min readJul 16, 2021

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ML questions

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Yunrui Li

Leetcode-Data Stream

What is data stream?

2 min readJul 15, 2021

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Leetcode-Data Stream

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Yunrui Li

Yunrui Li

I’m Taiwanese expat. I’v worked in Singapore as data scientist after graduation from Taiwan and currently I work in Amsterdam as machine learning engineer.

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