
LeetCode
Exercism
Codewars
HackerRank
CodeSignal
CodinGame
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Project Euler is a series of challenging mathematical/computer programming problems that will...

Nextdoor
Companion
Protechme
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Stay safe with instant alerts about nearby crime

Which is more popular?
Based on our record, Project Euler seems to be a lot more popular than Citizen. While we know about 415 links to Project Euler, we've tracked only 38 mentions of Citizen.
Website, pricing, platforms and company facts side by side.
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What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
No analysis of Citizen yet.
Walkthroughs and reviews on video.
Project Euler Challenges 1–4 - Coding Challenges with Florin
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How often each product is chosen within a category, 0–100% relative to the other.


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External articles and on-site reviews we used to compare the two products.


Project Euler provides a large collection of challenges in the domain of computer science and mathematics. The challenges typically involve writing a small program to figure out the solution to a clever mathematical...
If you are studying algorithms and computer programming, chances are you’ve heard of Project Euler. A collection of mathematical problems made for problem solvers who are interested to combine mathematics and...
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Recommendations tracked on public social media and blogs since March 2021.


Let's hope this is going to help me solve some more Project Euler [1] problems! [1] https://projecteuler.net/. - Source: Hacker News / 4 months ago
Https://projecteuler.net/ for "Thinker" brain food. (it still has the issue of not being a pragmatic use of time, but there are plenty interesting enough questions which it at least helps). - Source: Hacker News / 7 months ago
I have a Project Euler (https://projecteuler.net/) account. Though I do not register at all on the leader board I will sometimes work obsessively on a problem just to make one of the level icons light up for me. There is not really... - Source: Hacker News / 9 months ago
A few months ago when there was a lot of emergency services activity in my area and I didn't know why, I was reminded that no-one in my region is contributing a feed to Broadcastify. I went down the tunnel of using SDR to recieve those... - Source: Hacker News / 12 months ago
Citizen does this (https://citizen.com) I used it for a bit, and it had decent UX, but it seems designed to raise your anxiety until you pay for a snake oil subscription. YMMV. - Source: Hacker News / over 2 years ago
I hear sirens! The Phoenix Fire Board is a real-time list of car accidents (Code '962'), fires, and hazardous situations. You can also check out the Citizen App that people use to report things happening around them. Source: about 3 years ago
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