ps. look out for all my other solutions for Advent of Code challenges here. Day 13 See details of the challenge here. Today’s challenge involves solving two separate problems: counting set bits in an integer level order tree traversal For the first problem, I recommend reading through this blog post which covers several approaches and optimizations for this …
A good friend pointed me to a nice coding challenge she encountered – finding the Equilibrium Index of an array in O(n) time. After a quick discussion we ended up with 2 solutions, and naturally I had to code them up in F# Solution 1 This is the same approach to the one you saw in …
ps. look out for all my other solutions for Advent of Code challenges here. Day 12 See details of the challenge here. The input for today’s challenge looks like this: cpy 1 a cpy 1 b cpy 26 d jnz c 2 jnz 1 5 cpy 7 c … This is very similar to Day 23 …
ps. look out for all my other solutions for Advent of Code challenges here. Day 11 See details of the challenge here. Today is perhaps the first AOC challenge that is really challenging and required a lot of thought, and I really enjoyed it! First, let’s model the problem domain. and we’ll need a way to …
Binary Search Trees (BST) seem to be a hot topic in technical interviews. So, in order to help me prepare for all these grilling technical tests, I thought I’d give it a crack at implementing insertion, deletion and verification logic since I’ve already done both breath-first and depth-first traversals. Verification Starting with something nice and …
We looked at breath-first tree traversal earlier today, now let’s take a look at depth-first tree traversal as well. Here, we loop through the tree starting with the root, yield the value for each of the nodes before recursively traversing down all the left branch first and then the right branch. Try it Yourself Links Breath-First …
Another common problem I see during my preparation for technical interviews is the Level Order Tree Traversal (or Breadth-First) problem. I always like to think with my F# hat on when I solve algorithm problem, so here’s an implementation in F# . Here we have a nested recursive loop function that: yields the value from the nodes …
ps. look out for all my other solutions for Advent of Code challenges here. Day 10 See details of the challenge here. The input for today’s challenge looks like this: bot 171 gives low to bot 4 and high to bot 84 bot 1 gives low to bot 117 and high to bot 81 bot 82 …
ps. look out for all my other solutions for Advent of Code challenges here. Day 9 See details of the challenge here. The input for today’s challenge is a very long string like this: (6×9)JUORKH(10×13)LNWIKDMACM(126×14)(21×8)QLKUJNVVZIQGGFCJZMPHK(2×1)ZH(59×3)(38×14)KELEPIDYLCGJUBCXACRSOCEZYXLO… First, let’s see how we’re gonna parse this input. The approach I went with is to recursively split the input …
Another tasty challenge that I ran into during my preparation for technical interviews is this seemingly simple problem from Facebook. input [2,3,1,4] output [12,8,24,6] Multiply all fields except it’s own position. Restrictions: 1. no use of division 2. complexity in O(n) The main challenge is in making the algorithm run in O(n) time. One solution I …
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