Tomoharu Tsutsumi – Medium

Tomoharu Tsutsumi

Tomoharu Tsutsumi

Faced an error that resolve doesn’t work in GraphQL-Ruby.

Recently started learning GraphQL because I’ll use it in a company. Roughly, I understood but I spent 3 hours solving a problem. The…

2 min read6 days ago

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Faced an error that resolve doesn’t work in GraphQL-Ruby.

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Tomoharu Tsutsumi

What is GOPROXY?

I joined a new Go project. While building the local environment, I face this error message.

1 min readApr 21, 2024

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What is GOPROXY?

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Tomoharu Tsutsumi

Greedy Algorithm

A problem I tried

1 min readMar 30, 2024

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Greedy Algorithm

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Tomoharu Tsutsumi

Tried a design problem of Amazon’s sales rank by category feature

I tried this problem. I could learn some points and summarize them.

2 min readMar 16, 2024

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Tried a design problem of Amazon’s sales rank by category feature

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Tomoharu Tsutsumi

Improved an algorithm from O(n log n) to O(m + n)

Recently, I’ve started reviewing algorithm problems I did in the past in order to find better solutions.

1 min readMar 3, 2024

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Improved an algorithm from O(n log n) to O(m + n)

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Tomoharu Tsutsumi

Instead of splice, use swap and pop【JavaScript】

Hi, I’ve been immersed in leetcoding. Especially, I’m spending a lot of time improving bad code I wrote before. Today, I could improve…

1 min readFeb 25, 2024

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Instead of splice, use swap and pop【JavaScript】

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Tomoharu Tsutsumi

Not O(N²), but O(log N)

When I saw this algorithm below at first, I thought the time of complexity was O(N²). However, it is O(log N). I’ll explain it.

2 min readFeb 11, 2024

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Not O(N²), but O(log N)

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Tomoharu Tsutsumi

How to make a habit of studying

Studying takes us much time. In particular, I’m a software engineer, which requires tons of knowledge. Besides, I have to learn English…

2 min readFeb 3, 2024

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How to make a habit of studying

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Tomoharu Tsutsumi

Tackled a problem of developing a web crawler architecture

Hi, architects. I learned a new problem of architecture and summarized what point was good and bad.

2 min readJan 27, 2024

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Tackled a problem of developing a web crawler architecture

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Tomoharu Tsutsumi

How to avoid O(N²)

Hi, algorithm aficionados! Recently, I’ve started learning algorithms and found some patterns of making them faster. I’ll share one of them…

4 min readJan 20, 2024

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How to avoid O(N²)

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Tomoharu Tsutsumi

Tomoharu Tsutsumi

Senior Software Engineer Senior Software Engineer at an industry-leading startup( Ruby | JavaScript | Go | Rails | React | Redux | Gin)

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