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# Preparing for IOI

 9 8 Hello people,I wanted to have a chronological order for all the topics for the preparation of IOI and that is why I am creating this thread. The main motive is that my school has allowed me and other interested students to form a group to start preparing students for OIs. I will be introducing it to the junior classes. So, it would be nice if the order started from the very basics and went to intermediate or even advanced if people are willing to contribute. This is a community wiki so feel free to edit it for the help of myself and all those who prepare for IOI in present or future. :)I know that these exist: But non of these are "chronologically ordered". Topics are better ordered with increasing order of difficulty, starting from changing from Turbo C++ to GNU C++11. For now, I am creating a very rough order. I hope more people contribute to it. Also, I will keep editing it till I can. :) Big O Notation Ad hoc problems Brute force Using DFS Using BFS Permutation generation Subset generation Maths Greedy Data structures(Excluding graph) Arrays Strings Vectors Stack Queue Heap List Deque Divide and conquer Binary search(In an array/On answer) Merge sort Segment tree Merge sort tree Centroid decomposition Dynamic Programming Introduction(Possibly using the classic fibonacci example) LCS/LIS Edit Distance Knapsack Matrix Chain multiplication Graphs BFS/DFS Flood Fill Shortest Path algos MST String algos P.S. Add subtopics as subcategories :)Thank you in advance to all who contribute! This question is marked "community wiki". asked 07 Aug, 15:58 1.6k●3●13 accept rate: 20% 2 All the best dear :) (07 Aug, 16:03) You can add some topics too @vijju123 :P (07 Aug, 16:06) Great initiative @ista2000 (09 Aug, 22:25) But not one contribution from anyone :( (10 Aug, 05:57) ^^ This might be helpful although this just contains topics for ZCO and INOI. (12 Aug, 20:01) @mathecodician It will also be good if you add one or two topics ;_; (12 Aug, 20:43) showing 5 of 6 show all

 2 I think bruteforce is the most basic skill: BFS, DFS, combination and permutation generation. answered 07 Aug, 23:28 4★vasja 515●1●6 accept rate: 7% I second this. Without brute force you'll never know if your solution is correct. (08 Aug, 01:52) liaojh5★ Thank you, you can edit the original post though. :)The only reason I put it out because I most likely will miss some topics. (08 Aug, 02:03) What is a brute force? Can someone explain? (19 Aug, 06:20) kunnu1202★
 0 Most of the students love maths,so i think number theory will be good after bruteforce. answered 08 Aug, 11:09 1.4k●1●8 accept rate: 13% Please do add anything you want to suggest. That's the whole point of marking it as a community wiki (08 Aug, 14:50)
 0 Well probably there must be something related to STL of C++ as well. Being honest I didn't know much regarding it at start :p answered 08 Aug, 13:41 440●1●8 accept rate: 8% Sure, please feel free to add anything you would like :) (08 Aug, 14:49) Can you tell me how can I add? P.S. I am not that familiar with this stuff. Sorry if its annoying question :p (10 Aug, 23:15)
 0 Hey @ista2000 It is really good that you have started it. You can take help from forums too. They include quite good topics. Moreover talking about number theory you can add topics like  1.Euler totient function. 2.Matrix Exponentiation(Not sure whether it's a part of number theory but it is quite useful when you work on recursive function). 3.Fermat Little Theorem is also very important sometimes (in modulo functions) 4.Lastly I remember a topic SOS Dynamic Programming approach. If you want to add. :)  answered 10 Aug, 15:30 226●7 accept rate: 8% Thank you :) (12 Aug, 20:15) 1 U r welcome :)Btw those links were helpful. (13 Aug, 14:25)
 0 @ista2000 if it is possible then please provide us with links to these topics as there is much information on web and finding a better resource may not be possible for noobs like me so please help by adding links. Anyways nice initiative. answered 20 Aug, 19:14 51●2 accept rate: 0%
 0 https://www.commonlounge.com/discussion/f6052177ea3543439251079f57f480e0 (From Commonlounge community of International Olympiad in Informatics) Haven't found a better compilation for IOI preparation than the above playlist. Hope this helps! answered 21 Aug, 23:43 2★orcus 1 accept rate: 0%
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