# Overview

Usually I try to solve the original challenge from Project Euler first and then tackle its modified version at Hackerrank which is often harder.

I'm a software developer and don't have to mathematical knowledge to solve most of the hard problems.

However, I'm quite good when the solution "just" requires a smart choice of data structures and/or clever use of raw CPU power.

My favorite problem are those with a Dynamic Programming solution.

And of course these little gems that can be somehow applied to real-life computer problems:

Some code snippets are part of several problems. You find a small code collection in my toolbox.

# Heatmap

green problems solve the original Project Euler problem and have a perfect score of 100% at Hackerrank, too.

yellow problems score less than 100% at Hackerrank (but still solve the original problem).

gray problems are already solved but I haven't published my solution yet.

blue problems are solved and there wasn't a Hackerrank version of it at the time I solved it or I didn't care about it because it differed too much.

red problems are solved but exceed the time limit of one minute.

*Please click on a problem's number to open my solution to that problem:*

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I scored 12,626 points (out of 14300 possible points, top rank was 20 out ouf ≈60000 in July 2017) at Hackerrank's Project Euler+.

Look at my progress and performance pages to get more details.

My username at Project Euler is

**stephanbrumme**while it's stbrumme at Hackerrank.

# Most recently solved

July 20, 2017: Problem 240 - Top DiceJuly 19, 2017: Problem 349 - Langton's ant

July 18, 2017: Problem 345 - Matrix Sum

July 17, 2017: Problem 347 - Largest integer divisible by two primes

July 17, 2017: Problem 130 - Composites with prime repunit property

July 15, 2017: Problem 336 - Maximix Arrangements

July 14, 2017: Problem 250 - 250250

July 14, 2017: Problem 249 - Prime Subset Sums

July 13, 2017: Problem 154 - Exploring Pascal's pyramid

July 13, 2017: Problem 160 - Factorial trailing digits

... and 196 more ...