I started competitive coding in my first year of college following my interest of solving logical problems and it gradually became one my core interests. 2, A Description: List of random Codeforces problems, all of them are Div. Helped me a lot.Thanks a lot. pls make on other topics as well, The only programming contests Web 2.0 platform, Dynamic Programming,from novice to advanced, A little bit of classics: dynamic programming over subsets and paths in graphs, Algorithms Series | Session 3 | Dynamic Programming (Arabic), New Year and the Permutation Concatenation, https://www.youtube.com/watch?v=34Drti_iMsg, https://www.youtube.com/watch?v=TNgPT91sn90, https://www.youtube.com/playlist?list=PLPt2dINI2MIattDutu7IOAMlUuLeN8k2p, https://www.youtube.com/playlist?list=PLPSFnlxEu99Gc6mSTVoYzPG77tnUW8znJ, https://www.youtube.com/playlist?list=PLamzFoFxwoNjtJZoNNAlYQ_Ixmm2s-CGX, https://www.youtube.com/playlist?list=PLMCXHnjXnTnto1pZVvH7rbZ9W5neZ7Yhc, https://www.youtube.com/playlist?list=PLiQ766zSC5jM2OKVr8sooOuGgZkvnOCTI, https://www.youtube.com/playlist?list=PLrmLmBdmIlpsHaNTPP_jHHDx_os9ItYXr, https://www.youtube.com/playlist?list=PLJULIlvhz0rE83NKhnq7acXYIeA0o1dXb, https://www.youtube.com/playlist?list=PLqM7alHXFySGbXhWx7sBJEwY2DnhDjmxm, https://www.youtube.com/playlist?list=PLfBJlB6T2eOtMXgK3FLUTawHjzpIEySHF, https://www.youtube.com/playlist?list=PLZDUDpMlJOnzqEo45zDQjuZqv2PGRNHI1, https://www.youtube.com/watch?v=FAQxdm0bTaw, https://www.youtube.com/channel/UCdNNY8Y8meG3z9Wy6MTzcLg/videos, https://www.youtube.com/watch?v=U4O3SwDamA4, https://www.youtube.com/watch?v=rlTkd4yOQpE, https://www.youtube.com/playlist?list=PLawezQIZQjju9cZPjjD1vQK8IuNxcRD8u, https://www.topcoder.com/community/competitive-programming/tutorials/dynamic-programming-from-novice-to-advanced/, https://www.codechef.com/wiki/tutorial-dynamic-programming, https://www.quora.com/How-can-one-start-solving-Dynamic-Programming-problems/, https://drive.google.com/file/d/1K68sWVc5e4MnyACr2i5sLKWIhShn638S/view?usp=sharing, https://www.quora.com/How-can-I-be-perfect-in-dynamic-programming-How-should-I-practice/answer/Bohdan-Pryshchenko?ch=10&share=9a742611&srid=DDSy, https://www.youtube.com/watch?v=FAQxdm0bTaw&t=312s, https://codeforces.com/group/hK6hgc8x94/contests, https://www.youtube.com/watch?v=YBSt1jYwVfU, https://www.youtube.com/watch?v=1mtvm2ubHCY&t=72s, https://www.hackerrank.com/challenges/kingdom-division/problem, https://www.youtube.com/watch?v=nqowUJzG-iM&list=PL_z_8CaSLPWekqhdCPmFohncHwz8TY2Go, 2020-2021 ICPC, NERC, Southern and Volga Russian Regional Contest (Online Mirror, ICPC Rules), Codeforces WatchR: 10K+ downloads on Google Play, Technocup 2021 Elimination Round 3 and Round #692 (Div. Dismiss Join GitHub today GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. You have to solve these problems to develop DP skills, Different types of Dynamic programming problems in one blog. This is a very comprehensive 94-part course on competitive programming. The problems are sorted, the most solved problem comes first. Beginner Home / A Problems / brute force / Codeforces / dp / 189A Codeforces - Cut Ribbon. And practice more, take your time. Auto comment: topic has been updated by Ahnaf.Shahriar.Asif (previous revision, new revision, compare). I may sound negative but there is no place for jerks like you who don't know how to praise good work and demotivate others from doing something. https://www.youtube.com/watch?v=FAQxdm0bTaw&t=312s Here Errichto explains some DP problems. Contests are quite rare, at least the main ones (AGC). A Problems B Problems C Problems D Problems E Problems URI Online Judge. Please tell me that in graph from which topic (among bfs,dfs,shorting algorithms,networkflow etc) questions are frequently asked in divison2 and divison1 or which topic is more necessary? However what i find easy might be difficult for others. Array uses an integer value index to access a specific element. Codeforces is a Russian website dedicated to competitive programming. My Review about Scaler academy. The more you get experienced, the more you'll learn the importance of sorting things for practicing. Dynamic Programming Problems and solutions (VPlanet): https://vplanetcoding.com/course2#698A, Dynamic Programming Problems Collection (Codeforces Blog): https://codeforces.com/blog/entry/20284, How can I be perfect in dynamic programming? Ahnaf.Shahriar.Asif I went through it from beginning. Codeforces is a free online platform that offers regular coding contests. → Pay attention Before contest Codeforces Round #672 (Div. It helped me a lot in grasping very basic dp questions and tricks. Now i am solving questions that you said were necessary to improve dp skills. 2) taking place on Aug/21/2020 17:35 (Moscow time).The round is rated for users whose rating is lower than 2100.All problems were mainly created Programming competitions and contests, programming community The only programming contests Web 2.0 platform This weekend, on [contest_time:1223] we will hold Codeforces Round 591. They provide different modes of services like — participation in the short (2-hours) contests, challenge/hack other contestants solutions, ability to solve problems from previous contests for training purposes and many other. 5. This is a very comprehensive 94-part course on competitive programming. List of 100 beginner friendly questions on codeforces Programming competitions and contests, programming community Ahnaf.Shahriar.Asif I went through it from beginning. The problems here require a lot of thinking and trying before coming up to solutions. Codeforces is a project joining people interested in and taking part in programming contests. If you understand Bengali, it may help. Initially it was scary for me. If you would like to tackle the 10 most recently published problems then go to Recent problems. ®ããªããªã£ã¦ããã®ããªã©æ°ã«ãªã£ãã®ã§èª¿ã¹ã¦ã¿ã¾ããã¡ãªã¿ã«ã â¦ ], http://www.spoj.com/problems/RIOI_3_2/ (5) //VERY NICE (easy imple â Number Theory thinking), http://www.spoj.com/problems/MAXWOODS/ (3) //NICE [EASY][GRID], http://www.spoj.com/problems/DIEHARD/ (3) //Easy â prolly solvable by greedy (but dp is easier), http://www.spoj.com/problems/DCEPC810/ (4) //VERY VERY NICE â Subsequence 2pointers+2bools, http://www.spoj.com/problems/EQ2/ (4) //NICE: Digit + Carry (from back) â iff-party, http://www.spoj.com/problems/DCEPC501/ (3) //NICE & EASY, http://www.spoj.com/problems/NUMTSN/ (4) //NICE â Thinking or Opti, http://www.spoj.com/problems/GONE/ (4) //NICE & EASY [digits], http://www.spoj.com/problems/RAONE/ (4) //NICE & EASY [digits] â almost similar as above, http://www.spoj.com/problems/STRSEQ/ (4) //VERY VERY NICE â Next-Function, http://www.spoj.com/problems/MYQ8/ (4) //VERY NICE â 3x3 tic-tac-toe [implementation], http://codeforces.com/contest/859/problem/C (3) //Easy+Sympathic [PrefixSumOptional], http://codeforces.com/contest/859/problem/D (4) //NICE [Probabilities], http://www.spoj.com/problems/UNICA/ (4) //VERY NICE [Posibilities][Print][Classical], http://www.spoj.com/problems/KOPC12H/ (4) //NICE Digit-DP, http://www.spoj.com/problems/DRACULA/ (4) //NICE Digit-DP (Both sides) â iterate by sum, http://www.spoj.com/problems/ABCPATH/ (3) //DP over dfs (maybe without dp works too? AtCoder is a programming contest site for anyone from beginners to experts. Beginners might get scared if the very first question drives them off. 10818 UVA (5) //Easy â but not-easy implementation: ++Dijkstra [LEX! Please tell me is it in sequence or just random material to learn from? A beginner's practice tutorials on Data Structures which includes tutorials on Arrays, Stacks, Queues, Hash Tables, Linked List, Trees, Advanced Data Structures, Disjoint Data Structures. Here is a list I gathered a few weeks ago: Dynamic Programming (Egypt Scholars Inc.): https://www.youtube.com/watch?v=34Drti_iMsg, Dynamic Programming (Eng. As New year and multiply require number theory and combinatorics along with dp. Codeforces â the only place with the community (and thus the rating matters more here). The round will not be rated for any On one hand, Codeforces is a social network dedicated to programming and programming contests. If there is non-positive, you need to move two negatives to the list of positives, because the product of two negatives is positive. How should I practice? SlavicG and I are glad to invite you to Unofficial Div 4 Round #2. Catalin Pit - Oct 1. https://www.hackerearth.com/practice/basic-programming/implementation/basics-of-implementation/practice-problems/algorithm/bob-and-subset-23f0729c/, https://www.hackerearth.com/challenge/competitive/september-circuits-17/algorithm/coin-game-3-1762eeeb/, https://www.hackerearth.com/challenge/competitive/january-circuits-18/algorithm/road-1-63e2e618/, https://www.hackerrank.com/contests/w36/challenges/a-race-against-time, https://agc015.contest.atcoder.jp/tasks/agc015_c, https://codeforces.com/contest/983/problem/B, https://codeforces.com/contest/988/problem/F, https://www.hackerrank.com/challenges/equal/problem. It aims to enable holding contests when you don't have the test data. So I am not sure regarding order, you know better. To all my Indian juniours and experienced professionals, Never join Scaler Academy(Interviewbit). URI Online Judge is a project developed for you! Patterns are the most basic and intuitive problems for any beginner entering into the programming world. I think you are generalizing everyone with your own BS experience. Hi CodeForces ! I found initial questions difficult as they involved combinatorics and number theory concepts. ç«¶æããã°ã©ãã³ã°ã¯ è¨èªã®å
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è¦ãããã¾ãã :), https://www.hackerrank.com/challenges/kingdom-division/problem add this to dp and tree problems please. The problems archives table shows problems 1 to 729. This blog would cover all the basic algorithms and data structures to build a great foundation for such prestigious competitions. Recently , I learn Graphs . Update: I write stuff Here in Bengali. Where can I find solutions of second and third links since there are many less submissions of the problems ? He did at least try to help us. Index starts from 0 and goes till N-1 (where N is the size of array). The round will not be rated for any participants since it is unofficial. Maybe I mentioned this in the beginning. Vladik â Codeforces Round #689 (Div. a2oj has been shut down until further notice . This growing collection of challenges welcomes the complete novice coder, as well as those with more experience. Help needed from participants with rating up to 1500, Help me to find out the right approach of this code, The 'science' of training in competitive programming. It also helps you to manage and track your programming comepetions training for you and your friends. In DP tutorials, isn't 1. and 2. the same? So practice more and gather experiences. Today I've listed some DP tutorials and problems. We hold weekly programming contests online. So please everyone that have a collection of Graphs Problems (DFS,BFS,LCA,Dijkestra,...) Share that with me. Muhammad Afifi): https://www.youtube.com/watch?v=TNgPT91sn90, Dynamic Programming (Prof. Mostafa Saad): https://www.youtube.com/playlist?list=PLPt2dINI2MIattDutu7IOAMlUuLeN8k2p, Dynamic Programming Practice (Solver To Be): https://www.youtube.com/playlist?list=PLPSFnlxEu99Gc6mSTVoYzPG77tnUW8znJ, ÙÙÙÙÙÙÙÙÙÙÙÙÙÙÙÙÙÙÙÙÙÙÙÙ, Dynamic Programming Practice (IDeserve): https://www.youtube.com/playlist?list=PLamzFoFxwoNjtJZoNNAlYQ_Ixmm2s-CGX, Dynamic Programming (Gaurav Sen): https://www.youtube.com/playlist?list=PLMCXHnjXnTnto1pZVvH7rbZ9W5neZ7Yhc, Dynamic Programming, Recursion, & Backtracking (Back To Back SWE): https://www.youtube.com/playlist?list=PLiQ766zSC5jM2OKVr8sooOuGgZkvnOCTI, Dynamic Programming (Tushar Roy): https://www.youtube.com/playlist?list=PLrmLmBdmIlpsHaNTPP_jHHDx_os9ItYXr, Dynamic Programming (Abdul Bari): https://www.youtube.com/playlist?list=PLJULIlvhz0rE83NKhnq7acXYIeA0o1dXb, Dynamic Programming (GeeksforGeeks): https://www.youtube.com/playlist?list=PLqM7alHXFySGbXhWx7sBJEwY2DnhDjmxm, Dynamic Programming: From Zero To Hero (Rachit Jain): https://www.youtube.com/playlist?list=PLfBJlB6T2eOtMXgK3FLUTawHjzpIEySHF, Dynamic Programming (MIT Open Course): https://www.youtube.com/playlist?list=PLZDUDpMlJOnzqEo45zDQjuZqv2PGRNHI1, Dynamic Programming â AtCoder educational dp contest (Errichto): https://www.youtube.com/watch?v=FAQxdm0bTaw, Dynamic Programming Tutorials (VPlanet): https://www.youtube.com/channel/UCdNNY8Y8meG3z9Wy6MTzcLg/videos, Episode 19 â Knapsack (Algorithms Live! Solve practice problems for Basics of Hash Tables to test your programming skills. and Now I want to solve Problems in CF about graphs. I'll add them. Thanks, added. ... Code-Drills - Practice problems recommender (includes Codeforces, Codechef and Spoj). *has extra registration Right done dfs, http://codeforces.com/contest/802/problem/K (5) //Slightly DP-like (NICE) TREE, http://codeforces.com/contest/813/problem/C (3) //Simply 2 DFS: NICE + EASY, http://codeforces.com/contest/841/problem/D (4) //DFS while tracking "next", http://codeforces.com/contest/845/problem/G (5) //Keep track of cycles, http://codeforces.com/contest/844/problem/E (5) //Post-Order â line, Connect i â N-2: star, http://www.spoj.com/problems/CAC/ (5) //VERY NICE! the question also conveniently states that there are no spaces; only digits 1, 2, and 3, and plusses - we can use the str.split method and split on the "+" to get a list of the numbers (still in str form), and then sort that list and then use the str.join method to join them with a "+" again. thank youu. Dynamic Programming Type (Codeforces Blog): http://codeforces.com/blog/entry/325? I know this a repetitive ), http://www.spoj.com/problems/BEHAPPY/ (2) //Easy one â 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 â Digits & Bitmask & Query (learning! So people can easily practice on a wider range of problem types instead of repeatedly solving stuff that they are already familiar with the whole time. We help companies accurately assess, interview, and hire top developers for a myriad of roles. The goal is not to print just this one pattern, it is to learn the best approach to solve this kind of problems as these questions are frequently asked in coding exams and in job interviews. 100-questions-of-codeforces Note : Some Solution Links are not Problems. Timus OJ It is the largest Russian archive of programming problems with automatic judging system. List Tree. Detailed discussions and solutions to interesting problems from codeforces. Codeforces. We help companies accurately assess, interview, and hire top developers for a myriad of roles. In brief, on the contests held by Codeforces rules you write solutions to the problems that are tested during the contest on a very small number of tests. Note : Some Solution Links are not updated in the table. There is another DP contest in atcoder but looks only Japanese statements. I know this a repetitive question and a lot of people asked it in the past but please answer me. :(. These are not just random links. Panasonic Programming Contest (AtCoder Beginner Contest 186) 2020-12-13 21:00:00+0900 AtCoder Beginner Contest 185 2020-12-05 21:00:00+0900 AtCoder Regular Contest 110ï¼Sponsored by KAJIMA 2020-11-28 21 be rated for any participants since it is unofficial. Problems are mostly collected from regional contests. HackerEarth is a global hub of 3M+ developers. Managing state with React Context . Virtual Judge is not a real online judge. AtCoder is a programming contest site for anyone from beginners to experts. / BFS / TSP â NICE! | page 1 2), based on Zed Code Competition 2020 Theo830 â A new cf update that you may haven't notice mohammedehab2002 â [GYM] ECPC 2019 Kickoff As soon as you reach a certain "honor" (earned by solving programming challenges) level, you can author and contribute your own programming challenges and unit tests for the site, in addition to translating programming challenges and unit tests others have written into additional programming languages. well actually I keep a few DP problems, here they are: http://codeforces.com/contest/729/problem/F 6, http://codeforces.com/contest/735/problem/E 9, http://codeforces.com/contest/731/problem/E 5, http://codeforces.com/contest/721/problem/E 7, http://codeforces.com/contest/742/problem/D 4, http://codeforces.com/contest/712/problem/D 5, http://codeforces.com/contest/743/problem/E 6, http://codeforces.com/contest/745/problem/E (7), http://codeforces.com/contest/747/problem/F (5), http://codeforces.com/contest/752/problem/E (5), http://codeforces.com/contest/703/problem/E (7), http://codeforces.com/contest/722/problem/E (9), http://codeforces.com/contest/760/problem/F (8), 11451 UVA (4) //C==20 mistake in statement, http://codeforces.com/contest/762/problem/D 5, 11081 UVA (4) //3 string subsequences (beware of fail), http://codeforces.com/contest/678/problem/E (5) //bitset dp + probability, http://codeforces.com/contest/766/problem/C (4), http://codeforces.com/contest/667/problem/C (3), http://www.spoj.com/problems/MOVIFAN/ (3), http://www.spoj.com/problems/ORDSUM23/ (3), http://www.spoj.com/problems/DIVSEQ/ (4) //N^3 (but better...) works fine, http://codeforces.com/contest/633/problem/F (7) //Tree dp, http://www.spoj.com/problems/ADJDUCKS/ (4) sort + pick 2-3 continous O(N), http://www.spoj.com/problems/JLNT/ (4) //pick 0 or 2 | 1e3*5e3, http://www.spoj.com/problems/TPCPALIN/ (5) //500^3 works (3rd countable), http://www.spoj.com/problems/COLORSEG/ (4) //50^4==OK 50^4log(N)=TLE NICE, http://www.spoj.com/problems/POWERCAR/ (3) //1e3*1e3*2 â follow rules, http://www.spoj.com/problems/INGRED/ (5) //TSP-like [reduce + go], http://www.spoj.com/problems/BADXOR/ (4) //classical subsets, http://www.spoj.com/problems/SPCO/ (5) //64*64*2 DP {OPT: prime O(1) + clear only half}, http://www.spoj.com/problems/WAYHOME/ (5) //NICE: 1) 1*1 b)12,1,**,2, http://www.spoj.com/problems/NFURY/ (2) //Minimal sum of squares, http://www.spoj.com/problems/GDIL/ (3) //combinatorics, http://codeforces.com/contest/791/problem/D (5) //Tree, http://codeforces.com/contest/791/problem/E (6) //V,K,X â pick any, http://codeforces.com/contest/789/problem/C (3), http://codeforces.com/contest/796/problem/E (6) //NICE: N*P*K*K (WC can't happen! [not sure if grd poss. ], http://www.spoj.com/problems/A_W_S_N/ (4) //BFS + TSP (path) â NICE, http://codeforces.com/contest/776/problem/D (5), 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. [Beta] Harwest â Git wrap your submissions this Christmas! Codeforces. 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). competitive-programming data-structures problem-solving coding-challenges hackerrank-solutions interview-bit leetcode-cpp â¦ letters, http://codeforces.com/contest/638/problem/C (4) //greedy idea â easy, http://codeforces.com/contest/638/problem/D (5) //spec-DAG articulatin, http://codeforces.com/contest/767/problem/C (4), http://codeforces.com/contest/781/problem/C (5), http://codeforces.com/contest/794/problem/D (5) //NICE! Note: If you have some other tutorial links and nice problems, mention them. Hello , I am Aditya Paul, I am a student of College - Indian Institute of Information Technology, Surat, Gujarat. Another big pro of Codewars is that despite the name it's actually a very collaborative site. 2) and Technocup 2021 â Elimination Round 3, A new cf update that you may haven't notice, Invitation to CodeChef December Cook-Off 2020. It also has a discussion forum. CodeChef - A Platform for Aspiring Programmers. Hello Codeforces! Actually, I made it for my personal practice. (I don't care what you guys think so feel free to downvote). 10937 UVA (4) //find '!' You can keep track of your solved problems and get motivated to solve more. Codeforces. 2) Editorial. I probably have one or two basic DP tutorials too. Heyy, Thank You so much, I now believe that god exists. Though there are many good problems in Codeforces, but if you want to practice to code Yah, the second one is for the Chinese people. D you also have DP list, if yes. The algorithm tutorials include short intuitive video tutorials, as well as links to a more in-depth text 15-295: Competition Programming and Problem Solving, Fall 2019. By the way, your problems on spoj are very nice, thanks for them. Recently , I learn Graphs . Codeforces. If you are a beginner and want to prepare for IOI or ACM ICPC, this is an ideal place for you. 1, Div. If you would like to target some specific group more directly just say (sometime there are more problemsthan just in spoilers but it would need more direct search â also a can hardly do this for "general" topics like dfs, but for some I could), http://codeforces.com/contest/653/problem/E (6), http://codeforces.com/contest/769/problem/C 5 //FL:ODD/**** | bfs+greed NICE, 10968 UVA (3) //EASY + NICE (bfs withot <=2 nodes), http://codeforces.com/contest/796/problem/D (3) //NICE+EASY ... print visited in bfs (not par), 10888 UVA (4) //VERY NICE â but not main technique ... ++ DP /or/ MCMF, http://codeforces.com/contest/821/problem/D (5) //VERY NICE â Consider only points not GRID, http://www.spoj.com/problems/DIGOKEYS/ (4) //Easy [Nice problem â weird statement], http://www.spoj.com/problems/SPIKES/ (3) //Easy bfs (# of 's' * 2), http://www.spoj.com/problems/MULTII/ (4) //VERY NICE: BFS over numbers (K*10+d)%N, http://www.spoj.com/problems/ADV04F1/ (5) //VERY NICE: [imple] ~ N^4*BigConstant, http://www.spoj.com/problems/INVESORT/ (5) //Big limit (really usefull :P), http://www.spoj.com/problems/KNMOVE/ 3 //simple knights, http://www.spoj.com/problems/SERGRID/ 3 //almost classical, http://www.spoj.com/problems/NAKANJ/ 3 //Classical chess â KNIGHT, http://www.spoj.com/problems/PUCMM223/ (4) //NICE (but not many languages) â 2 moving [x][y], http://www.spoj.com/problems/SPIRALGR/ (4) //NICE (not typical) [SIEVE], http://www.spoj.com/problems/DCEPC706/ (4) //NICE â travelling outside, http://codeforces.com/contest/35/problem/C (3) //No obstacles [multiple starts], http://www.spoj.com/problems/ARBITRAG/ (4) //Or Floyd-Warshall, http://codeforces.com/contest/732/problem/F 7, http://codeforces.com/contest/700/problem/C 7, http://www.spoj.com/problems/EC_P/ (3) //bridges ONLY, http://www.spoj.com/problems/SUBMERGE/ (3) //Direct articulation, http://www.spoj.com/problems/GRAFFDEF/ (5) //Bridge tree, http://codeforces.com/contest/715/problem/C 9, http://codeforces.com/contest/741/problem/D 8, http://codeforces.com/contest/752/problem/F 5, http://codeforces.com/contest/766/problem/E 6, http://codeforces.com/contest/833/problem/D 7 //Very nice â hard (thinking + imple) + FW, http://www.spoj.com/problems/HOLI/ (4) //VERY NICE: 2*Distances from centroids, http://codeforces.com/contest/734/problem/E (5), http://codeforces.com/contest/727/problem/A (3), http://codeforces.com/contest/723/problem/E (6), http://codeforces.com/contest/709/problem/E (6), http://codeforces.com/contest/710/problem/E (4), http://codeforces.com/contest/758/problem/E (8), http://codeforces.com/contest/760/problem/B (3), http://codeforces.com/contest/761/problem/E (6), http://codeforces.com/contest/638/problem/B (3) //connect cons. 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