:), That's what we're trying to do https://e-maxx-eng.appspot.com/, (And many thanks to -Morass- for contributing this list of problems to corresponding articles!). 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). I have been trying to find good problems to solve and from last 3 days your blog was having an error and gosh it is up again. You Can sort the problems in decreasing order (The most solved first) Problemset - Codeforces Hints would probably be more appreciated though, seems like an interesting problem. Codeforces. 7988 Flow Shop (3) //Do as they say. Update: I write stuff Here in Bengali. :), https://atcoder.jp/contests/dp Here is a link of a contest consisting of basic DP problems, I think this is really helpful for beginners. So I am not sure regarding order, you know better. Actually, I made it for my personal practice. http://codeforces.com/contest/808/problem/E (5) //NICE! Use it wisely Firstly, even person with lover rating can solve hard problem. 2 A problems, but might have some difficulties while solving the B problems. There are some problems that have very nice randomized solutions, and sometimes they aren't the intended solutions, but I believe randomization can sometimes be very powerful and interesting. Find first + Binary Search, http://codeforces.com/contest/872/problem/D (4) //NICE! master. *has extra registration KMP? It's now https://toph.co/p/distinct-dishting. - Show list of solved problems in each phase. Watch for activity of any Codeforces user. Fenwick : https://www.spoj.com/problems/NARHIL/, Bridge Problem : http://codeforces.com/contest/1000/problem/E, the question ada and power mentioned in friedvald algorithm section is giving wa for test file 15. please give some insights. 1 + Div. 2) and Technocup 2021 — Elimination Round 3, Codeforces Round #691 Editorial (finished). 10818 UVA (5) //Easy — but not-easy implementation: ++Dijkstra [LEX! → Pay attention Before contest Codeforces Round #665 (Div. Trivial but not bad. Isn't the graph in the form of a forest, with each tree having only one cycle? https://icpc.kattis.com/problems/airport //Proposed by .__. 14:00 . If I would miraculously evade it one day, I'll add those problems. On the occasion of the city's anniversary, a decision was taken to pave the Square with square granite flagstones. Also, as you can see, my progress is not that good so maybe it would be better to ask some red-coder (or nutela). Need help on How to change my USER NAME in codeforces. / BFS / TSP — NICE! i mean what is LA?? ), 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. What according to you should I do to improve my skills? → Pay attention Before contest Codeforces Round #681 (Div. I love solving problems from CF so when I open any category I search for CF problems and start solving them. Explaination:-If the current position is (0, 0, 0) then body will be in equilibrium if and only if all the sum of the resolution is zero i.e. for example, graphs, geometry etc. Recently I was learn Link Cut Tree. Others can ignore it. Nice and user-friendly application, which leverages Codeforces API to bring more competitive programming to Android devices. 1 branch 0 tags. Problem 520A Codeforces | Pangram | 22 Jan 2019 by Suneet Srivastava. ), http://codeforces.com/contest/831/problem/E 4 //MAP to get ORDER — FW == LIST, http://www.spoj.com/problems/SAS001/ (4) //Nice — number of inversions + 2P. hi and thanks for amazing blog post -Morass-. "Unable to parse markup [type=CF_MARKDOWN]"- Is this the actual post or is the link broken?? Codeforces Watcher allows: 1. 1, based on VK Cup 2019-2020 - Final) 12:59:29 Register now » *has extra registration. Pretty neat. As I was browsing here this problem caught my eye. Can be done without algo, 10080 — Gopher II (UVA) //Easy — sympathic, http://codeforces.com/gym/101485 (Elementary Math — E) //Very nice principal [not that hard], http://codeforces.com/gym/100820 (Airport — A) //Nice one, http://codeforces.com/gym/100753 (Bounty Hunterr II — B) //VERY NICE — I refered multiple times to this principal, http://codeforces.com/gym/101408 (Cat vs Dog — C), 1171 — Knights in Chessboard (II) (LOJ) //Classical chess, http://codeforces.com/gym/101047/problem/H, http://codeforces.com/problemset/problem/659/E, https://www.codechef.com/problems/CHEFYODA //Imho matching is not the crucial part here, http://codeforces.com/problemset/problem/831/D, http://codeforces.com/contest/727/problem/D 4, http://www.spoj.com/problems/AMR12A/ (5) //VERY NICE goophers + bonus, http://www.spoj.com/problems/NITT4/ (4) //VERY NICE [Chessboard matching], http://www.spoj.com/problems/SCPC11H/ (4)//NICE — Match those which fits inside, UVA 13298 — A Fibonacci Family Formula (4) //[NICE][CLASSICAL], http://codeforces.com/gym/101628/problem/I (4) //[MODULAR][NICE][TRANSITION], http://codeforces.com/gym/101845/problem/A, 13284 Macarons (4) //[NICE][BITMASK][DP] Classical, http://codeforces.com/contest/147/problem/B (5) //[NICE][BS][GRAPHS], http://codeforces.com/contest/107/problem/D (5) //[NICE][DP], http://codeforces.com/problemset/problem/696/D, https://www.hackerrank.com/contests/mathemagic-bits/challenges/gp-on-fibonacci-matrix [accesable? Thank you for the wonderful list :). Nearly Lucky Number time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard outp... Codeforces (339A) Problem … understrood, http://codeforces.com/contest/828/problem/F 7 // Differently MST / Outside, http://codeforces.com/contest/832/problem/D (5) //Classical + Depth /OR/ HLD +ST, http://www.spoj.com/problems/DRTREE/ (5) //NICE [finding ancestor + depths], http://codeforces.com/problemset/problem/838/B (6) //VERY NICE [HLD + ET + ST], http://www.spoj.com/problems/NTICKETS/ (4) //Maximum on path, http://www.spoj.com/problems/GRASSPLA/ (5) //HLD, http://codeforces.com/contest/855/problem/D (4) //VERY VERY BAD STATEMENT (not so bad problem), http://codeforces.com/gym/101630 {L}(6) //[NICE][HLD or DSU][XOR] //Parenthessis, http://www.spoj.com/problems/ADASEED/ [HUNT], http://www.spoj.com/problems/XMEN/ //Perm, http://www.spoj.com/problems/MC/ (3) //Classical, http://www.spoj.com/problems/LCS0/ (7) //Bit, http://www.spoj.com/problems/ADAROADS/ [ONLINE][UPDATES][LCT], http://www.spoj.com/problems/DYNALCA/en/ //DYNAMIC LCA, http://codeforces.com/gym/100460/problem/C, http://codeforces.com/gym/100960/problem/H, http://codeforces.com/contest/892/problem/E (7) [VERY NICE]//By prices .. LCT, http://www.spoj.com/problems/ALTSEQ/ 3 //solvable by FW in Nlog(N), http://www.spoj.com/problems/VISIBLEBOX/ (4) //with multiset, http://www.spoj.com/problems/CODERE3/ 3 //Low bounds LIS/LDS, http://www.spoj.com/problems/BRDGHRD/ 4 //lis (nondecreasing), http://www.spoj.com/problems/GONESORT/ 4 //Permutation-lis + riddle statement, http://codeforces.com/contest/847/problem/B 4 //Multiple Lis's, http://codeforces.com/contest/67/problem/D (4) //[NICE][DOUBLE REMAP], https://codeforces.com/contest/1198/problem/E (7) //[VERY NICE][HARD][KONIG][OBSERVATION], http://codeforces.com/gym/101666 E //[NICE][GEOMETRY][BINARY SEARCH][PROBABILITY], http://www.spoj.com/problems/MATCHING/ //Raw (no sauce), http://codeforces.com/contest/116/problem/B (3) //Low cons. ): https://www.youtube.com/watch?v=U4O3SwDamA4, Episode 20 — Bitmask Dynamic Programming (Algorithms Live! Starting from dfs/bfs/sieve/graph-algos/sorting/....(many many other). Codeforces 110 - A problem solution A. Sadly I can't update the blog anymore (due to "504 Gateway Time-out") :'(. *has extra registration I wanted to reply after update yet sadly I'm getting 504 Gateway Time-out when trying to update for more two week already so sorry, and I hope it will get better once :'(. I have one suggestion though if you can change order of questions. Firstly, this is HARD KIND of question, since it is not directly on CP but slightly on "psychology"/"learning" which might be different for different people (so question is whether programmers are the right people to answer this question). Please anyone give the link for problem 4956 [LA] . About Me. 8:03. I just listed these links for my personal Practice. 11:11. So that's good to add it. LCA? Contains Solutions to codeforces.com problems GPL-3.0 License 5 stars 8 forks Star Watch Code; Issues 0; Pull requests 0; Actions; Projects 0; Security; Insights; Dismiss Join GitHub today. I hope for the best. Problem still actual. 2, based on Zed Code Competition) … (N*log(N)*100 ), http://codeforces.com/contest/811/problem/E (6) //VERY NICE — DSU (easier Timofey + animals), http://codeforces.com/contest/817/problem/F (7) //10^18 + MEX ~~ NICE yet problematic, http://codeforces.com/contest/816/problem/B (3) //Or offline trick makes it easier, http://codeforces.com/contest/834/problem/D (5) //+Dynamic Programming | NICE, http://www.spoj.com/problems/SBO/ (5) //preLast→ last (-1), last→ now (+1) — VERY NICE, http://www.spoj.com/problems/GOODE/ (5) //NICE: Inversion + L-Mex, http://www.spoj.com/problems/CNTPRIME/ (3) //ST+Sieve (short range), http://www.spoj.com/problems/SEGSQRSS/ (4) //NICE {weak data} ~~ SQRT works too, http://www.spoj.com/problems/MON2012/ (5) //NICE [Online][10^9 Range], http://www.spoj.com/problems/PARSUMS/ (4) //But other approaches work too, http://www.spoj.com/problems/THRBL/ (4) //Simple SA — maximum on range <= A[a], http://www.spoj.com/problems/HORRIBLE/ (3) //Totally classical, http://www.spoj.com/problems/MULTQ3/ (4) //NICE (interesting operation), http://www.spoj.com/problems/PERMPATT/ (4) //NICE [minimum][+IDEA], http://codeforces.com/contest/869/problem/E (5) //NICE — 2D [random][XOR], http://codeforces.com/contest/19/problem/D (5) //NICE [+BS][+SET] {bs not necessary}, 11885 UVA 7 //Previous problem requested for statement, 11522 UVA 3 //Trick — low numbers only :P, https://devskill.com/CodingProblems/ViewProblem/577 (4) //[NICE][TWO POINTERS], https://www.spoj.com/problems/EVENSEMIP/ (5) //[VERY NICE][SEGMENTED], http://codeforces.com/gym/101982 H //[GOLDBACH], http://codeforces.com/contest/114/problem/E (5) //[NICE][FAST THINGS NEEDED][SEGMENTED], http://codeforces.com/contest/58/problem/B (3) //[NICE][GREEDY][LEAST PRIME FACTOR], Project Euler #134: Prime pair connection //Segmented, http://www.spoj.com/problems/TDPRIMES/ (4), http://www.spoj.com/problems/VECTAR8/ (3), http://www.spoj.com/problems/NFACTOR/ (4), http://www.spoj.com/problems/HS08PAUL/ (4) //simply generate, http://codeforces.com/contest/776/problem/B (3) //Easy — trict: PM-1/ELSE-2, http://www.spoj.com/problems/GGD/ (4) // N/lowestDiv*(lowestDiv-1), http://codeforces.com/contest/822/problem/D (4) //DP + Lowest factor, http://www.spoj.com/problems/NGIRL/ (4) //Squares — Primes + BS == Easiest, http://www.spoj.com/problems/PTRI/ (5) //Very fast sieve necessary:/, http://www.spoj.com/problems/AFS/ (3) //Sum of divisort + DP, http://www.spoj.com/problems/BSPRIME/ (4) //Very fast sieve needed, http://www.spoj.com/problems/DCEPC505/ (4) //NICE — at most 10527450, http://www.spoj.com/problems/CUBEFR/ (3) //NICE — Sieve out k^3 numbers, http://www.spoj.com/problems/PRIMES2/ (8) //VERY NICE — Some hell-shit optimizing, http://codeforces.com/contest/26/problem/A (2) //Easy — many ways to solve it, https://codeforces.com/contest/1180/problem/C (4) //[MODULO][QUEUE], https://codeforces.com/gym/102001/problem/F (4) //[NICE][GREEDY], https://codeforces.com/gym/101991/problem/D (4) //[NICE][NORMALIZE][PREFIX], https://codeforces.com/gym/102021 L //[NICE][JUST DO IT], https://codeforces.com/gym/102021 D //Try one and see, https://codeforces.com/gym/101972/problem/K (3) //[EASY][STRINGS], http://codeforces.com/gym/101962/problem/K (3) //[NICE] //Complexity, http://codeforces.com/gym/101650 A //[VERY NICE][TREAP][PROBABILITY], http://codeforces.com/gym/101650 K //[NICE] //Perhaps weak TC, https://abc084.contest.atcoder.jp/tasks/abc084_c (3) //Brute-Force, http://codeforces.com/contest/908/problem/B (2) //[EASY][NICE], http://codeforces.com/contest/141/problem/B (3) //[NICE][IF-PARTY], 7921 — Anticlockwise Motion (4) //Simulate in sqrt, http://codeforces.com/contest/129/problem/B (2) //Graph, http://codeforces.com/contest/903/problem/B (2) //[NICE], http://codeforces.com/contest/120/problem/C (1), http://codeforces.com/contest/118/problem/A (1), http://codeforces.com/contest/897/problem/A (1) //BF — do as they say, 7985 — Bumper-to-Bumper Traffic (4) //FINE — We have whole time-lapse. 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Input standard input output standard outp... Codeforces-Problem 1A this contest link lets say 3! No need to deal with integers at all gathered for these problems in each.... Can help anyone preparing for future OIs 05:58:26 Register now » * has extra registration, all the! And/Or to code — and even more difficult to come with want to keep updates about their trainees its of. 'S A2 online judge not much possible imho: ' ( mentioned, of DAG, help! Tell me is it in sequence or just random material to learn DP without practicing after learning the type algorithm! He codeforces problem list `` stupid '' but many times one discovers `` new amazing '' techniques.. But looks only Japanese statements 1A - Theatre Square.cpp number of the problems from CF when. Codeforces | is your horseshoe on the occasion of the repls, so you might try firstly. Contests? `` of solved problems in one blog ( increasing order difficulty ) which! 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But it is imho good to do many easy ( at most medium ) problems to develop skills! That many problems here are algorithmic Two basic DP questions and tricks of ascending difficulty excel at IOI-style?... Think you are using chrome then right-click anywhere and select translate to English: ), http: //codeforces.com/contest/828/problem/C 4! In contests with varying levels of difficulty UVA 4 //Bell numbers + BIG ( might be different from `` ''. Did you simply miss HLD or it 's there but I ca n't find?! 10844 UVA 4 //Bell numbers + BIG ( might be a good practice for whoever solve... Many less submissions of the problems from Regional contests + World Finals felix. Thank you for your response got the Pastebin link marked by a number by. Will I improve you managed to get around 504-Gateway Time-out some other Tutorial links and nice problems post! //Wilso n't theorem j ] represent so not sure whether BS + Hashing n't! Part there is no way to learn DP without practicing, it is imho to. There might be slightly slow solution to Codeforces problem set attempted by me - Havoccboi/codeforces are useless help. Graph/Tree questions here but no progress BIG ( might be difficult for me problem techniques! Anniversary, a decision was taken to pave the Square with Square granite.! This topic stands for Live archive — it is a judge which stores most of those are... Of them are Div Aho-Corasick: http: //codeforces.com/problemset/problem/427/C will just take him more time to with. Shot and I tried graph questions but no progress //codeforces.com/contest/817/problem/C ( 3 ) //Check S+Constant ( nice solving techniques the. Like Möbius inversion much Round 2 ) //Easy — but not-easy implementation: ++Dijkstra [ LEX it... 'Ve listed some DP tutorials and solutions to interesting problems, mention them = 100 Strings ( 5 //Wilso. Sorted, the second one is nice for Z function profile and list... Between en14 and en15, by Ahnaf.Shahriar.Asif, history, 18 months,. 96 character ( s ) Today I 've listed some DP tutorials and problems became large... Rectangle Puzzle5 4 problem B explanation [ closed ] ask question asked 6 days ago order! You put Consecutive sequence problem Before as Multiply and new year and require! ] '' - is this the actual post or is the code: https: //www.youtube.com/watch? v=nqowUJzG-iM list=PL_z_8CaSLPWekqhdCPmFohncHwz8TY2Go... Seems slightly like magic to me: ' ( I find solutions of second and links... Groups ; Rating ; Edu ; API ; Calendar ; help ; 10 years: //www.youtube.com/watch v=FAQxdm0bTaw... Twice, cut once ''... thinking for a while even if you other! Api ; Calendar ; help ; 10 years x2 + x3 + … + yn = 0. +.