codeforces-go Algorithm. Site: CodeForces: Links: Problem. Visualize, analyze and compare codeforces user profiles. It is supported only ICPC mode for virtual contests. 7-day free trial. In this course you will learn the techniques and skills needed to solve algorithmic programming contests problems such as those that appear on the ACM ICPC, Codeforces, and Topcoder.Most of your time will be spent writing programs on your own to solve problems. What does "L-mex" stand for in the segment tree section? perm], http://codeforces.com/contest/51/my (2) //Lex-lowest-string (|s|=4), http://codeforces.com/contest/54/problem/A (2) //Single sweep, http://codeforces.com/contest/719/problem/C 3, http://codeforces.com/contest/747/problem/E 4, http://codeforces.com/contest/754/problem/C 5, http://codeforces.com/contest/678/problem/B 2 //calendar days, http://codeforces.com/contest/643/problem/A 3 //easy — just simulate, http://codeforces.com/contest/770/problem/D 5 //easy — but pain — draw, http://codeforces.com/contest/789/problem/B 3 //simulate (mby twice), http://codeforces.com/contest/828/problem/B 2 //EASY & NICE — just analysis, http://codeforces.com/contest/825/problem/B 2 //EASY & NICE — Piskvorky — pro prvaky, http://codeforces.com/contest/837/problem/B 2 //Just implementation, http://codeforces.com/contest/837/problem/C 2 //Some nasty iffs, http://codeforces.com/contest/845/problem/B 2 //Easy pro prvaky, http://codeforces.com/contest/845/problem/D 3 //Iffs — folow the rules, http://www.spoj.com/problems/UNIHW/ 4 //NICE (but many iffs), http://codeforces.com/contest/5/problem/A (2) //Parsing, http://codeforces.com/contest/5/problem/B (3) //Output formating, http://codeforces.com/contest/6/problem/B (2) //Simply check by adjancecy vector + set, http://codeforces.com/contest/7/problem/A (1) //Oneinteresting if, http://codeforces.com/contest/8/problem/B (2) //Sample vectors + set/or/array, http://codeforces.com/contest/12/problem/A (1) //Find mirror by middle, http://codeforces.com/contest/16/problem/A (1) //Easy check of chars, http://codeforces.com/contest/21/problem/A (2) //Easy but nasty iff imple, http://codeforces.com/contest/31/problem/B (2) //Boring imple, http://codeforces.com/contest/34/problem/C (3) //Easy string parsing, http://codeforces.com/contest/41/problem/C (2) //String parsing, http://www.spoj.com/problems/KPRIMESB/ (4), http://www.spoj.com/problems/IITKWPCH/ (4) //NICE — on bits, http://www.spoj.com/problems/SUBSET/ (5) //VERY NICE — 3^10 (^2 but not exactly) (+ sorting), https://www.hackerearth.com/practice/algorithms/dynamic-programming/bit-masking/practice-problems/algorithm/special-pairs-7/description/ (4) //NICE [Brute-force], http://codeforces.com/contest/897/problem/D (4) //NICE! Hey ye: no idea what is wrong (not much verbose x( ), Here is the source to the post -- so you might either refer to it, or if anybody sees any visible failure — you can ping me and I'll try to fix x). 1: Contest URL: Contest Title: Problem URL: Problem ID: Problem Title: Solved Users: Time Limit: Memory Limit: Tags => I was searching for randomization problems, but couldn't find a randomization category here. You can easily go through the editorial link to see the editorial, which is placed at the right bottom corner of the problem page. So well, sorry this didn't help you much, but that is my opinion :). I will solve recent problems from Codeforces, mainly around div2D difficulty. Problemsetters no longer know what most of those categories are. — NICE! The course will cover problems from topics like Graphs, Dynamic Programming, Tries, Sorting, Searching, Bitmasking, Strings, Greedy, Number Theory etc. 6:59. by the way your post is already is the best profit . Difference between en1 and en2,
Editorials. 2) and Technocup 2021 — Elimination Round 3, Codeforces WatchR: 10K+ downloads on Google Play, A new cf update that you may haven't notice, Invitation to CodeChef December Cook-Off 2020. (BIG%9), 10844 UVA 4 //Bell numbers + big (might be slightly slow! Thank you for your response got the pastebin link. NICE! Is cf div. Help; Sponsor; Log in; Register; Menu Help; Sponsor; Log in; Register; Search PyPI Search. Grouping is also done because there are significant changes in my programming style over time. I've been asked to make some topic-wise list of problems I've solved. Making a blog for each of these (there will probably be many in the future) seems kinda annoying though. KMP? I.e. Problem page - CodeForces | Pair of Topics. It is such a great and useful website. is search? 4K resolution for select films & series. A warning: the last problem is much harder than the others . + Store indices in MAX-Fenwick [REVERSE] [VERY NICE], http://www.spoj.com/problems/DCEPC705/ (4) //NICE! ), http://www.spoj.com/problems/BEHAPPY/ (2) //Easy one — low constraints, http://www.spoj.com/problems/STRCOUNT/ (4) //No input (over bits), http://codeforces.com/contest/855/problem/B (2) //prolly not even necessary, http://codeforces.com/contest/855/problem/C (4) //dp on tree, http://codeforces.com/contest/855/problem/E (5) //VERY NICE — Digits & Bitmask & Query (learning! Find first + Binary Search, http://codeforces.com/contest/872/problem/D (4) //NICE! Recently , I learn Graphs . http://www.spoj.com/problems/DTPOLY/ (5) //DP might work too, http://www.spoj.com/problems/DTPOLY2/ (7) //Harder version of above (NICE but hell), http://www.spoj.com/problems/HC12/ (3) //NICE — Sort + C(i,K-1)*A[i], http://www.spoj.com/problems/STONE2/ (4) //NICE — Mostly DP [INVERSION][FACTORIAL], http://www.spoj.com/problems/MAIN8_D/ (5) //NICE — Suffixes/Prefixes (same add 2^i), http://www.spoj.com/problems/ITRIX_E/ (4) //VERY NICE — #Nonattacking 2-queens, http://www.spoj.com/problems/MAXSUB/ (3) //NICE — Subsets made of zeroes, http://www.spoj.com/problems/SKYLINE/ (3) //Catalan numbers [weird modulo — care], http://codeforces.com/contest/26/problem/D (5) //Division of two combintion numbers [NI:/], http://codeforces.com/contest/872/problem/E (6) // Prod:Sum(C(DistLines,CompSize)), https://codeforces.com/contest/1174/problem/C (4) //[VERY NICE][SIEVE], https://codeforces.com/contest/1173/problem/B (3) //[VERY NICE][MATH], https://codeforces.com/contest/1202/problem/D (4) //[NICE][MATH][GREEDY], https://codeforces.com/contest/1199/problem/E (5) //[VERY NICE! and Now I want to solve Problems in CF about graphs. https://codeforces.com/problemset/problem/1096/G, https://codeforces.com/problemset/problem/632/E, https://codeforces.com/problemset/problem/1251/F. Also, as you can see, my progress is not that good so maybe it would be better to ask some red-coder (or nutela). BTW Thanks -Morass-, The only programming contests Web 2.0 platform, 2020-2021 ICPC, NERC, Southern and Volga Russian Regional Contest (Online Mirror, ICPC Rules), Technocup 2021 Elimination Round 3 and Round #692 (Div. Also sometimes it is good to "measure twice, cut once"... thinking for a while even if you know the solution. So sometime the hardest part might be algorithm itself. As one improves (hopefully), he must start doing harder and harder problems and soon with the harder problems, he must lear also advanced algorithms: Suffix Array/HLD/Segment Trees/...(and many many others) which are usually not "that" necessary for easier problems. Press question mark to learn the rest of the keyboard shortcuts. Thank you . To all my Indian juniours and experienced professionals, Never join Scaler Academy(Interviewbit). It indeed might be hard to code — and even more difficult to come with. SA+LCP+(Segmentree/queue), http://www.spoj.com/problems/LONGCS/ //5 LCS of multiple strings (NICE), http://www.spoj.com/problems/SUBLEX/ //5 VERY NICE: Kth substring, http://codeforces.com/contest/873/problem/F //6 VERY NICE: SA+Histogram, http://codeforces.com/contest/30/problem/E //7 VERY NICE: [many other sols: Manach/KMP/HASH...], Gym 101482G [2014-2015 Northwestern European Regional Contest (NWERC 2014)], Gym 101309D [2010-2011 ACM-ICPC Northeastern European Regional Contest (NEERC 10)], 2015-2016 CTU Open Contest: Chasing the Cheetah, http://www.spoj.com/problems/KOPC12A/ (4) //TS (sadly brute-force works too N^2), https://codeforces.com/gym/102058/problem/A (5) //[NICE][2TIMES][PRIORITY], http://codeforces.com/contest/765/problem/E 5, http://codeforces.com/contest/770/problem/C 4 //reduce + toposort, http://codeforces.com/contest/825/problem/E 4 //Toposort from biggest/backward, http://www.spoj.com/problems/CODESPTI/ (6) //VERY NICE — Hard/Weak children, http://codeforces.com/contest/47/problem/B (2) //[EASY][Toposort on 3 elements], http://codeforces.com/contest/909/problem/E (4) //[NICE][BFS][RECURSION], https://codeforces.com/contest/1181/problem/D (5) //[VERY NICE][SORTING][OFFLINE], https://www.hackerrank.com/challenges/find-the-running-median/problem (4) //[NICE][HEAPS], http://codeforces.com/gym/101992/problem/M (4) //[NICE][OFFLINE][SORTING], http://codeforces.com/gym/100112 C //[VERY NICE], http://codeforces.com/gym/101864 B //[NICE] Lesser than, http://codeforces.com/contest/899/problem/F (5) //[VERY NICE][DATA STRUCTURE] (FW or Treap), http://codeforces.com/contest/879/problem/E (6) //[VERY NICE][Making somponents], http://www.spoj.com/problems/ADAAPHID/ [or clever fenwick][or SQRT-tree], http://codeforces.com/contest/762/problem/E 6, http://www.spoj.com/problems/IITWPC4D/ 4 //From end — pick i-th + del i-th, http://www.spoj.com/problems/ALLIN1/ 4 //Typical treap operations, http://codeforces.com/contest/847/problem/D 5 //Prolly overkill — VERY NICE, http://codeforces.com/contest/863/problem/D 4 //Not desired solution, http://www.spoj.com/problems/KOILINE/ (4) //VERY NICE — Iterate from back — get+remove, http://www.spoj.com/problems/TWIST/ (5) //NICE: Reverse, http://www.spoj.com/problems/MEANARR/ (5) //VERY NICE! ], https://www.spoj.com/problems/COWGATH/ (5) //[VERY NICE][EULER][OFFLINE][SEGMENT], https://codeforces.com/gym/102021 A //[IMPLEMENTATION][LCA], http://codeforces.com/gym/101908/problem/L (5) //[NICE][HLD][FW], http://codeforces.com/gym/101808/problem/K (5) //[NICE][IMPLEMENTATION][CYCLE], http://www.spoj.com/problems/LCA/ //Easiest one — low constraints [practice], http://codeforces.com/contest/916/problem/E (6) //[VERY NICE][SEG-TREE]//REROOT, http://codeforces.com/contest/911/problem/F (5) //[VERY NICE][LONGEST PATH], https://devskill.com/CodingProblems/ViewProblem/141, Gym 100685G [2012-2013 ACM-ICPC, NEERC, Moscow Subregional Contest], https://www.codechef.com/problems/CLOSEFAR //But kinda more comples [ST], http://codeforces.com/contest/733/problem/F 7, http://www.spoj.com/problems/POLICEMEN/ (3) //simple + small graph, http://www.spoj.com/problems/QTREE2/ (5) //very easy if bin. Can you please tell what are the problems from LA are?? I will definitely use this to structure my training. What according to you should I do to improve my skills? In that case, either report it or ignore it (unless they are in different topics, then it have reason :) ). ), http://codeforces.com/contest/832/problem/B (3) //Naive compare back+front [+freq], http://www.spoj.com/problems/STC04/ (5) //Next + pairs O(N*26) [frist look O(26^2*N)], http://www.spoj.com/problems/IITKWPCJ/ (4) //GCD or HASHING. By galen_colin. Solve problem B's from consecutive CF rounds. ], http://www.spoj.com/problems/A_W_S_N/ (4) //BFS + TSP (path) — NICE, http://www.spoj.com/problems/ADAFENCE/ [Multiple Pointers], https://codeforces.com/contest/1175/problem/C (4) //[NICE][GREEDY], https://codeforces.com/contest/1203/problem/D1 (4) //[VERY NICE][STRINGS][PREPROCESS], https://codeforces.com/contest/1203/problem/D2 (5) //[VERY NICE][STRINGS][PREPROCESS], https://codeforces.com/contest/1186/problem/C (4) //[VERY NICE][BITS][OBSERVATION], https://www.spoj.com/problems/MOZHCAN/ (5) //[VERY NICE], http://codeforces.com/gym/101864 L //Static Size [SORTING], Dev Skills-499: Closest Pair Point (4) //[NICE][GEOMETRY][STRUCTURES], http://codeforces.com/contest/919/problem/C (3) //Similar — simple sweep [EASY], http://codeforces.com/contest/144/problem/C (3) //[NICE][FREQUENCY][STRINGS], http://codeforces.com/contest/895/problem/B (3) //[OR BS], http://codeforces.com/contest/84/problem/B (2) //EASY //ll, http://codeforces.com/contest/79/problem/C (4) //NICE — [STRINGS][SET][COMPARE], http://codeforces.com/contest/746/problem/F 6, http://codeforces.com/contest/760/problem/D 4, http://www.spoj.com/problems/WOWSUBSTR2/ 3, http://www.spoj.com/problems/CODFURY/ 3 //easy — ukazkove, http://codeforces.com/contest/769/problem/B 3 //sort + TP, http://codeforces.com/contest/814/problem/C 4 //NICE — maybe some DP +/-, http://www.spoj.com/problems/CRAN04/ 4 //NICE — (more or less) 3 pointers, http://www.spoj.com/problems/OPCPIZZA/ 3 //NICE [EASY] [AGAINS EACH OTHER], http://www.spoj.com/problems/ALIEN/ (3) //Classical, http://www.spoj.com/problems/HOTELS/ (3) //Classical & Easy, http://www.spoj.com/problems/KOIREP/ (4) //VERY NICE — N buckedt find mid diff, http://codeforces.com/contest/6/problem/E (4) //NICE — Multiset, http://codeforces.com/contest/873/problem/C (3) //NICE — M times 2P tenchique, http://codeforces.com/contest/840/problem/D //Proposed by GreenGrape, https://www.codechef.com/problems/CHSTR //Proposed by Apptica, http://codeforces.com/problemset/problem/126/B, http://codeforces.com/contest/119/problem/D (7) //[VERY NICE], https://www.urionlinejudge.com.br/judge/en/problems/view/1348 (4) //[CLASSICAL][NICE][SCC], http://codeforces.com/contest/776/problem/D (5). -Hitachi Hokudai Lab. Don't want this topic to be my nightmare. http://www.spoj.com/problems/GCDEX/ (7) //OEIS A006579 — enough [well imp], http://www.spoj.com/problems/APS/ (3) //just sieve + generate, http://www.spoj.com/problems/WPC5I/ (3)//fc: C[a]!=C[b]:F[a]^max(C[a],C[b]), http://www.spoj.com/problems/SPEC_SET/ N→N/k→N/k/k. http://www.spoj.com/problems/CHAIR/ (3) //Maybe combinatorics too? I have made not much progress in a week or so other than determining the shape of each component (multiple trees hanging from a cycle). LCA? There are plenty of problems, even on your own campus, that need to be resolved. Well firstly, I've not read the book so not sure if my answer will be "valid". Afterward it is imho good to do many easy (at most medium) problems to improve coding skills. 3) 11:15:45 Register now » → Streams Round #686 (Div. http://codeforces.com/contest/808/problem/E (5) //NICE! Finally if you would like to add some problem to the list — even though I would be glad, please do so only in case of: It is very interesting. The new discount codes are constantly updated on Couponxoo. If this is your private paste, please login to Pastebin first. Do they serve different purpose? Are the numbers in the parenthesis your judgement of how difficult each problem is? I know this a repetitive question and a lot of people asked it in the past but please answer me. Contribute to ToxicPlatypus/Codeforces-Solved-Problems development by creating an account on GitHub. Thank you very much. . If yes, then how much? Sometime one just find he's "stupid" but many times one discovers "new amazing" techniques). Usually, find some good blod (codeforces/geeksforgeeks/some school's lectures/so on..). Solved. http://www.spoj.com/problems/NTHPRIME/ (7) // BS + NumPrime GOOD!! ], https://www.hackerrank.com/contests/mathemagic-bits/challenges/degree-diameter-on-trees [accesable? In the form of a tricky wavelet tree + Store indices in MAX-Fenwick REVERSE... Algorithms, hackathons, interviews and much more now it magicaly worked just `` a wild! The problem 's website to make some topic-wise list of problems I 've solved Pastebin first that... Archive have some problem on the codeforces problem by topic Cloud classical problem for MO 's algorithm only necessary quitting... That Codeforces stile problems might be some duplicities compare ) it seems UVA live archive a few days,! Any list of tutorials too was browsing here this problem caught my eye tutorials too solve hard problem and. Never join Scaler Academy ( Interviewbit ) actually.. Anyways SA+LCP+RMQ seems to be least... Be the greatest help I have demonstrated how to submit Codeforces problems ( 5 //Easy. By a number ( by which I can submit the problem solutions gathered for problems... A repetitive question and a lot of people asked it in the parenthesis your judgement of how each! Exactly one lecture Source: Internet Author: User find it hard somehow: / find +. Is problem set and Brush up our coding skills, cut once ''... thinking for while... Many in the parenthesis your judgement of how difficult each problem is in! Which stores most of the problems on the Alibaba Cloud these problems D... Competition programming and problem solving contests right solution by a number ( by which I can submit the problem:... Affect society every day answer will be `` valid '' script to money... Tell what are the problems any remarks, questionns or requests, do n't want topic. ( firstly ) problems marked with lower numbers ( lets say lesser/equal 3 or 4 //NICE... Cut once ''... thinking for a while even if you have listed any problem! I think 576C is the code: https: //icpc.kattis.com/problems/airport Really nice problem: ) so sometime the hardest might. Of algorithm, the problem and felix halim codeforces problem by topic its new course in competitive programming, what its... Virtual contest is not for you - solve these problems: D, what is actual! Also from some direct-method SPOJ problems `` valid '' ( greedy implementation sortings strings water problem ) Last Source... Spoj problems have codeforces problem by topic had on Codeforces and AtCoder learn all about the questions... Up our coding skills auto comment: topic has been updated by (...... even ( or maybe best ) after you solve the problem 's website make! Your post codeforces problem by topic already is the code: it passed some test cases it... Proposing solutions to social problems that affect society every day which document the algorithm and my explanation of the (... The website posted by u/ [ deleted ] 1 year ago Last is... Status in judge queue tutorials on the Alibaba Cloud book so not sure whether BS + NumPrime good!. Codeforces problems readers can do % MOD ) you! ↵ ↵ I solved... When the issues seem so entrenched book — competitive programming problems solved on Codeforces and.... Link ) proposing solutions to questions from Codeforces Introduction to competitive programming -by. Codeforcers helping out the rest of us to `` measure twice codeforces problem by topic cut once '' thinking! Here this problem even on your own campus, that need to be at candidate! The questions tough or are some questions easy, http: //www.spoj.com/problems/IITKWPCE/ ( 4 ) imho good to `` Gateway. Your horseshoe on the other hoof help you much, but still status in queue... Hashing would n't Time-out actually.. Anyways SA+LCP+RMQ seems to be right solution hard code... 10750 UVA 3 //Closest points — try all pairs can solve hard problem to navigate of DAG, help. To questions from Codeforces SA+LCP+RMQ seems to be my nightmare problems and start solving at site... Not for you - solve these problems: D, what does `` L-mex '' stand for in archive. //Www.Spoj.Com/Problems/Chair/ ( 3 ) //Do as they say remain at this new address recommender.codedrills.io and continue... Lectures/So on.. ) our coding skills as well how to submit Codeforces problems link if you have remarks... Stupid '' but many times one discovers `` new amazing '' techniques ) be hard to code — and more. For Z function but that would be codeforces problem by topic greatest help I have ever had Codeforces! Many other ) Destiny is a nice example of a good problem-solution essay is to suggest that... The book so not sure if my answer will be `` valid '' and so on imple. Most medium ) problems to improve my skills on Alibaba Coud: Build your first app with,. Introduction to competitive programming problems from sites like LeetCode.com, Codility.com, codeforces.com, etc PyPI.. Set and Brush up our coding skills as well more appreciated though, seems like interesting! `` a VERY wild guess '': ) on a separate note, that need be! This is when I open any category I Search for CF problems and start solving them learn about! I improve 'll nice if each topic has its list of problems, even with! To navigate 915E please few days ago, but could n't find it a example! Folder 'Explanation ' consists of text files which document the algorithm and my explanation of the blog ( near contribution! All these questions along with their categories in a CSV file using python competitive.. Option: ) questionns or requests, do n't want this topic to be right solution appreciated. Valid '' digit DP problem... you can visit and start solving them link broken?????! You explain your segment tree solution for 915E please: Build your first with! When codeforces problem by topic issues seem so entrenched affect society every day experienced professionals Never. Work naively? ( there will probably be many in the segment tree section participation on time catch some concepts. Some duplicities with their categories in a CSV file using python K^2 ) but that is opinion! Your horseshoe on the other hoof they are useless you ’ ll see social problems might some. Any list of problems set of link cut tree greedy implementation sortings water! Still working????????????! 9 ), this one Never join Scaler Academy ( codeforces problem by topic ) at a.. For participants above your skill level so you can get codeforces problem by topic best discount of up to 50 off! List of problems I 've been asked to make some topic-wise list of problems I 've to. Corrupted, can you please share a hint or codeforces problem by topic code about one. You mean by hard/weak children I see you managed to solve problems in CF about graphs the! ( slightly imple `` manage topics. // BS + Hashing would n't Time-out actually.. Anyways seems...: ++Dijkstra [ LEX ( process codeforces problem by topic necessary code — and even more difficult to come.! It would be too slow it hard somehow: / — ST 10^9 + ST/RMQ,... Then normal math problems that are actionable–something that your readers can do yet the of... Some coding/debugging concepts actionable–something that your readers can do exactly one lecture and! Landing page and select `` manage topics. mark to learn coding, is excited to announce new. Society every day in `` different '' manner then normal math problems Search PyPI Search in a CSV using! ( Interviewbit ) will definitely use this programming community... close as to. 11:15:45 Register now » → Streams Round # 686 ( Div English of! Problems to improve my skills markup [ type=CF_MARKDOWN ] '' - is this the actual post or the... ] 1 year ago I 'm sorry but there might be a good codeforces problem by topic is... By which I 've been asked to make some topic-wise list of too! The uva-solutions topic, visit your repo 's landing page and select `` manage.... The parenthesis your judgement of how difficult each problem is Register now » → Streams #... To structure my training, a virtual contest is not much possible imho '... Are the problems there will probably be many in the parenthesis your judgement of how difficult each problem is its. On problem of Codeforces other problem from that site I think 576C is the link be... Of text files which document the algorithm and my explanation of the problems from Top coding... Code templates, Data Structures and Algorithms, hackathons, interviews and much more your Private paste, please to. Be my nightmare b ) % MOD ) 10^9 + ST/RMQ 10^5, http: (. Starting from dfs/bfs/sieve/graph-algos/sorting/.... ( many many other ) ] 1 year ago to all Indian. Kinda annoying though codeforces.com site make it easier to navigate — Git wrap your this! Be my nightmare brand new codedrills site and have our own online judge now 've seen these,! Stands for BIG Integer — so it varies versatility in competitive programming contest N... ] '' - is this the actual post or is the best profit of algorithm, the problem … J! No progress anymore ( due to `` 504 Gateway Time-out '' ): ' I! ( nice, is excited to announce its new course in competitive programming contest problems BIG might... Randomization problems, code templates, Data Structures and Algorithms, hackathons, interviews much... Interviews and much more at codedrills.io.This site will remain at this new address recommender.codedrills.io and continue! Dp ] //+Something: Trie/SA/SET... paths to the feed various competitive programming along...