saurabhyadavz's blog

Everything on Mo's Algorithm
By saurabhyadavz, 4 years ago, In English

Possibly, someone called "MO" once used the trick in a local contest, and the name stuck and later got popular. I have never encountered the name "Mo's algorithm" outside of competitive programming.

The technique, or the term "Mo's Algorithm" ("莫隊算法" in Chinese) was originally thought of and popularized by 莫涛 (Mo Tao) and his teammates. It was first used to tackle a problem from 2009 China IOI Camp: 小Z的袜子(hose) — authored by 莫涛 himself. The problem was: given a sequence of integers, for any given interval, calculate the probability of choosing any 2 numbers and the 2 numbers are equal.

Now let's start. I have here compiled the tutorial, some articles written by me, and problems on Mo's algorithm.

Tutorials:

Basic problems:

I have written some basic articles on Mo's algorithm which has been published on Geeksforgeeks.

List of problems:

Edit:

Thanks for the upvotes! It means a lot to me

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Comments Comments (15)
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4 years ago, # |
  Vote: I like it +4 Vote: I do not like it

great research saurabhyadavz.

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4 years ago, # |
  Vote: I like it +6 Vote: I do not like it

There must be a bookmark option to save such blogs .

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    4 years ago, # ^ |
      Vote: I like it +8 Vote: I do not like it

    Well said. These awesome blogs must be bookmarked.

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    4 years ago, # ^ |
      Vote: I like it +20 Vote: I do not like it

    There is a bookmark option. You can click star near upvote and downvote buttons and this blog will be added to your favourite blogs. You can watch them in your profile or using this link.

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4 years ago, # |
  Vote: I like it +16 Vote: I do not like it

Mo is someone's name, writing "Mo's algorithm" makes more sense, no capital O. Where did that come from anyway?

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    4 years ago, # ^ |
      Vote: I like it +3 Vote: I do not like it

    Thanks for pointing out though. I think it comes from China.

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      4 years ago, # ^ |
        Vote: I like it +14 Vote: I do not like it

      The algorithm of course comes from China ;), but somehow I doubt the capital-O spelling comes from there.

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        4 years ago, # ^ |
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        It’s MO’s in order to capitalize on the big O runtime.

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4 years ago, # |
  Vote: I like it -16 Vote: I do not like it

I remember a time when I was stuck in a question in Codechef Long Challenge. This blog is really gonna help all.

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4 years ago, # |
← Rev. 2   Vote: I like it +3 Vote: I do not like it

Hey dude, nice blog! Thanks a lot.
Just wondering what made you think the part you have written after edit!

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4 years ago, # |
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For MO's Algo on trees, how to find the LCA of two nodes??

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16 months ago, # |
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The page https://blog.anudeep2011.com/mos-algorithm/ doesn't load for me. Does this work for someone else?

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6 weeks ago, # |
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One more problem based on Mo's Algorithm 221D - Little Elephant and Array

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