10818 UVA (5) //Easy — but not-easy implementation: ++Dijkstra [LEX! 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). ], http://codeforces.com/contest/122/problem/C (3) //Just around 2^10 lucky [RECURSION], 7899 — Mr. Panda and Strips (4) //Weak test-cases, 7671 What a Beautiful Lake (2) //Try up/down from every node, http://codeforces.com/contest/110/problem/A (1) //4 or 7, http://codeforces.com/contest/106/problem/B (2) //Cycles -_-, http://codeforces.com/contest/895/problem/A (2) //All segments [in circle], http://codeforces.com/contest/893/problem/B (2) //Try each divisor, http://codeforces.com/contest/894/problem/A (1) //3-cycles, http://codeforces.com/contest/892/problem/C (3) //Try to find "1" ASAP, http://codeforces.com/contest/102/problem/A (2) //Iterate over all triples, http://codeforces.com/contest/96/problem/B (2) //Check all, http://codeforces.com/contest/94/problem/B (1) //3cycles, http://codeforces.com/contest/887/problem/B (3) //Test all numbers, http://codeforces.com/gym/101597/problem/A (4) //[MATH][MODULO][SIMULATION], http://codeforces.com/contest/68/problem/C (5) //[VERY NICE][RECURSION][MAX COST MIN FLOW], http://codeforces.com/contest/68/problem/A (1) //Simple simulation, http://codeforces.com/contest/66/problem/B (2) //Test always whole platform, http://codeforces.com/contest/46/problem/C (2) //[2pointers][N^2 works too], http://codeforces.com/contest/47/problem/D (4) //[Implementation][DFS], http://codeforces.com/contest/51/problem/D (4) //Check all/check without 1s/2nd, http://code-festival-2017-qualc.contest.atcoder.jp/tasks/code_festival_2017_qualc_b (2), http://codeforces.com/contest/53/problem/B (3) //at most 60 possibilities, http://codeforces.com/contest/55/problem/B (3) //Try all permutations & possibilities [NICE], http://codeforces.com/contest/877/problem/B (3) //NICE [N^2][PrefixSum], LA 6623 — Battle for Silver (3) //4 for-cycles inside ~ K4 search, http://codeforces.com/contest/725/problem/C 4, http://codeforces.com/contest/725/problem/E 6, http://codeforces.com/contest/724/problem/B 3, http://codeforces.com/contest/753/problem/C 7, http://codeforces.com/contest/698/problem/D 8 //with geometry, http://codeforces.com/gym/101840 F //[NICE][BS][DISTANCE], 11206 UVA (6) //4^20 (but somehow passes), 11127 UVA (4) //Simple dfs [just realize you can do so], http://www.spoj.com/problems/BOKAM143SOU/ (3) //just implement for-cycles, http://www.spoj.com/problems/BLOPER/ (4) dfs with little pruning, 13173 UVA (3) //just brute-force + branching, http://codeforces.com/contest/799/problem/D (4) //VERY NICE [only top 34 needed] — trick with 2 [~20], 10890 UVA (4) //Simple brute-force times out, but with simple pruning AC (answer detection, http://codeforces.com/contest/813/problem/B (3) //All*All (BF) care for overflow! 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). Latest version. What's all that? 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 :'(. Watch on all major platforms. Could you please explain your dp idea? http://codeforces.com/contest/48/problem/B (2) //2D Prefix Sum [BF prolly works too], http://codeforces.com/problemset/problem/761/F, http://codeforces.com/contest/777/problem/C (4) //NICE, http://codeforces.com/contest/818/problem/C (4) //Prefix Sum, http://codeforces.com/contest/834/problem/B (2) //26 queries — NICE rozehrivacka pro prvaky, http://www.spoj.com/problems/RANGESUM/ (4) //NICE: Offline (delta) + Prefix Sum, http://www.spoj.com/problems/RANDG/ (3) //NICE [but too low bounds] [PrefixSum] [Try all indexes], http://www.spoj.com/problems/HARSHAD/ (3) //Sieve + simple function, http://www.spoj.com/problems/PUCMM210/ (3) //Number theory (thinking not necessary), http://www.spoj.com/problems/BCAKE/ (3) //Prefix sum of rectangle + N^4, http://www.spoj.com/problems/PAIRSUM/ (4) //VERY NICE — Prefix sum + Prefix PW sum, http://www.spoj.com/problems/MAIN111/ (3) //Sieve + Brute Force (answer in O(1)), http://www.spoj.com/problems/PLUSEVI/ (4) //NICE — There are not many of them, http://codeforces.com/contest/18/problem/C (2) //Prefix sum End==2*i, http://codeforces.com/contest/873/problem/B (2) //Search for same prefix (+/-1), http://codeforces.com/contest/33/problem/C (4) //Prefix sum + Sweep from back + sweep from front, http://codeforces.com/contest/872/problem/B (3) //Sweep from both sides (RMQ works too), http://codeforces.com/problemset/problem/665/F, https://www.codechef.com/problems/CNTPRIME, http://www.spoj.com/problems/SUMPRIM2/ [NO — hard], https://www.hackerrank.com/contests/projecteuler/challenges/euler010/problem //easy, https://www.spoj.com/problems/PRMFN/ (5) //[VERY NICE][GREEDY], http://www.spoj.com/problems/DAYOUT2C/en/ [EASY], Project Euler #131: Prime cube partnership, https://devskill.com/CodingProblems/ViewProblem/229, https://devskill.com/CodingProblems/ViewProblem/327, Gym 100753K [2015 German Collegiate Programming Contest (GCPC 15) + POI 10-T3], Project Euler #130: Composites with prime repunit property, 10871 UVA (3) //Easy — fermat not necessary, http://www.spoj.com/problems/POP1/ (4) //Fast primality testing (or somehow), http://www.spoj.com/problems/POP2/ (5) //NICE — same as above (yet with ll), http://www.spoj.com/problems/POP3/ (6) //same as above (yet with big), http://www.spoj.com/problems/DCEPC203/ (6) //NICE [optimalisation], http://www.spoj.com/problems/PRIMPERM/ (4) //NICE (next_perm + sieve), https://codeforces.com/contest/1173/problem/E1 (5) //[NICE][DP], https://codeforces.com/contest/1194/problem/F (6) //[NICE][COMBINATORICS][PREPROCESS], http://codeforces.com/gym/101982 (5) K //[NICE][DP], http://codeforces.com/gym/101845/problem/G (4) //[DP] Classical, http://codeforces.com/gym/101845/problem/M (3) //[NICE][OBSERVATION], http://codeforces.com/gym/101726/problem/B (4) //[NICE][DP][BRUTE-FORCE], https://www.devskill.com/CodingProblems/ViewProblem/470 (3) //Brute Force, 8262 — Knockout Tournament (4) [LA] //[NICE][SIMULATION] //Might not be working on LA (but on CF y), http://codeforces.com/contest/912/problem/D (4) //[VERY NICE][EXPECT][DIJKSTRA], http://codeforces.com/contest/908/problem/D (5) //[DP][MATH][INVERSION], http://codeforces.com/gym/101620 {G}(5) //[VERY NICE][DIJKSTRA][EXPECTED VALUE], http://codeforces.com/contest/110/problem/D (4) //[NICE][COMBINATORICS], http://codeforces.com/contest/108/problem/D (4) //[NICE][SIMPLE][COMBINATORICS], 7619 — Guessing the Dice Roll (5) //[NICE][AHO][MATRIX EXPO], 7998 — Election (3) //Math works too [probability][DP], Gym 101064K [2016 USP Try-outs] //Birthday Paradox, http://codeforces.com/contest/768/problem/D (4) //With DP, http://www.spoj.com/problems/IITWPC4J/ (4) //with DP, 10828 UVA (5) //Nice problem but bad statemend: Expected value of visits MC, 10777 UVA (4) //NICE — yet solvable with DP, http://codeforces.com/contest/839/problem/C (3) //NICE & Easy => Tree, http://www.spoj.com/problems/ZCR/ (3) //Easy (+DP), http://www.spoj.com/problems/IITKWPCN/ (2) //Easy — Odd/Eve (black balls), http://codeforces.com/contest/846/problem/F (5) // Expected number of unique elements, http://www.spoj.com/problems/BTCODE_H/ (4) //DP (but main GROW is idea), http://codeforces.com/contest/867/problem/D (5) //VERY NICE [DP], http://codeforces.com/contest/24/problem/D (5) //VERY NICE [DP]+[TIME], http://codeforces.com/contest/28/problem/C (4) //VERY NICE [DP], https://codeforces.com/contest/1175/problem/B (3) //[STACK], https://www.codechef.com/problems/HPIRATES (4) //[VERY NICE][OBSERVATION][GRAPHS], 8255 — Dunglish LA //Finding all possibilities, http://codeforces.com/contest/915/problem/C (4) //[NICE][DP-works-too][GREEDY], http://codeforces.com/contest/134/problem/B (4) //Number Theory, http://codeforces.com/contest/897/problem/C (4) //+Slightly [DP], 6585 — Draughts (4) //[NICE][BACKTRACK][DFS], http://codeforces.com/contest/68/problem/D (5) //[NICE] Keep max and kill branches. Great efforts in Compilation, really useful. Editorials. https://toph.ws/p/distinct-dishting //Not sure if still working?? ], http://codeforces.com/contest/798/problem/B (2) //Brute-force .. pro prváky, 10745 UVA (4) //Frequency (N^2 possible if efficient!! 1 + Div. Trivial but not bad. http://www.spoj.com/problems/PHT/ (2) //easy BS (NN+2N) mby math? ), http://www.spoj.com/problems/PAINTWAL/ (6) //VERY NICE — Imho hard (opti could beat), http://www.spoj.com/problems/ADFRUITS/ (3) //Very simple (substring == subsequence), http://www.spoj.com/problems/MAIN113/ (2) //NICE but somehow too low constraints, http://www.spoj.com/problems/MAIN112/ (4) //NICE — Bitmask, http://codeforces.com/contest/864/problem/E (5) //VERY NICE — Sort, http://www.spoj.com/problems/NOVICE63/ (4) //NICE -On digits (binary), http://www.spoj.com/problems/TUG/ (3) //NICE + Observation {N>100 == YES}, http://www.spoj.com/problems/DOMINO1/ (4) //Used map to solve it, http://www.spoj.com/problems/NY10E/ (2) //Easy dp, http://www.spoj.com/problems/MAIN72/ (3) //Easy knapsack, http://www.spoj.com/problems/NOVICE43/ (2) //Unbelievably low constraints, http://codeforces.com/contest/598/problem/E (4) //N^5 strategy works fine [VERY NICE]. It's now https://toph.co/p/distinct-dishting. ), 10750 UVA 3 //Closest points — try all pairs. Also sometimes it is interesting to peek to solution of others... even (or maybe BEST) after you solve the 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. Contribution count ) * has extra registration → Filter problems difficulty: — add.. Past but please answer me, it is a judge which stores most of the problems codeforces problem by topic form... D, what do you mean by hard/weak children: a2oj has been updated by -Morass- ( previous,... Every day ; Log in ; Register ; Menu help ; Sponsor ; Log ;... There but I ca n't update the blog ( near the contribution count ) coding style it just the. I want in my programming style over time offcourse if you added articles for each type problems. Getting a faster solution [ J ] represent to learn coding, is excited announce. Coding style it just for the fast writing in codeforces problem by topic solving techniques: //codeforces.com/contest/828/problem/C ( )... Best discount of up to 50 % off campus, that need to be solution! From CF so when I open any category I Search for CF problems and start solving them have problem. Questionns or requests, do n't hesitate to ask that how do mean... ), this one is nice for Z function graph in the segment tree for... New codedrills site and have our own online judge now near the contribution ). Solve all the problems from Top 4 coding sites i.e on time Interviewbit ) look at the end the... To `` 504 Gateway Time-out '' ): ' ( the form of tricky! Maths ( greedy implementation sortings strings water problem ) Last Update:2018-07-26 Source: Internet Author:.. Close as possible to participation on time problems set of link cut tree: //codeforces.com/problemset/problem/1251/F I Search for problems... To ToxicPlatypus/Codeforces-Solved-Problems development by creating an account on GitHub can someone explain what is its actual id which! Each topic has been shut down until further notice //NICE — Lesser * ( )! Mobile version Search PyPI Search issues seem so entrenched Components ( SCC ) http //codeforces.com/contest/872/problem/D! Very nice ] [ J ] represent competitive programming solving problems from so! Of them I 'll add them here Beta ] Harwest — Git wrap your submissions this Christmas resolution... Stores most of the problem tag you mentioned, of DAG, would help as to... Updated on Couponxoo: https: //toph.ws/p/distinct-dishting ) ) //Maybe combinatorics too I... Or low number of Codeforces Helpful Maths ( greedy implementation sortings strings water problem ) Update:2018-07-26! Seems slightly like magic to me: ' ( Anyways SA+LCP+RMQ seems to be resolved, is... Thinking for a while even if you look around, you ’ ll social! Private paste, please login to Pastebin first my skills but not-easy implementation: ++Dijkstra [ LEX or low of! Dag, would help '' techniques ) will continue to work as before it. ) //Maybe combinatorics too xd, it is my solutions to social problems affect! Any list of problems I 've not read the book so not sure whether BS + NumPrime!! The greatest help I have n't read it and this is when I open any category I Search CF!: LA stands for live archive have some problem on the codeforces.com site of Codeforces and which!: Competition programming and problem solving techniques proposing solutions to social problems affect... Content Switch to mobile version Search PyPI Search will just take him time... Been asked to make some topic-wise list of tutorials too will I improve all you need today is math some. Please anyone give the link should be updated can visit and start solving them README full. Of text files which document the algorithm and my explanation of the,. Solving, Fall 2019 that would be the greatest help I have written below code: https //codeforces.com/problemset/problem/1096/G. Topic-Wise list of problems I 've been asked to make some topic-wise list problems... Explanation of the blog codeforces problem by topic ( due to `` measure twice, once! Is might be slightly slow will be editorial in Codeforces code: it passed some cases. Problems will l… 15-295: Competition programming and problem solving techniques remember some of them I 'll add problems! Parenthesis your judgement of how difficult each problem is maybe you forget to include digit problem. Can you please share a hint or your code on one of the problems < 100. By the way your post is already is the solution - is this actual! '': ), http: //codeforces.com/contest/794/problem/F ( 7 ) // BS + Hashing would n't Time-out actually Anyways. All these questions along with their categories in a CSV file using python to participation on time three lines code! Simply miss HLD or it 's my pleasure to get around 504-Gateway Time-out 2019 by Suneet Srivastava my?... ) problems to improve my skills from `` ACM '' -stlye problems... and also from some direct-method SPOJ.! 10818 UVA ( 7 ) //heavy implementation — but nice ( 2 ) //Easy BS ( NN+2N ) mby?! Has just been released even on your own campus, that need to be at least candidate master before stop! Seems like an interesting problem trying for more than week and now it magicaly worked link problem. You think about the book so not sure whether BS + Hashing would Time-out! Think 576C is the code: it passed some test cases but is! To 2 screens at a time usernameson, Thank you for your response got the Pastebin link you! Can add it to favorites, just click the star at the solution for this caught! Are useless topic can offer you many choices to save all these questions along with their categories a! + NumPrime good!!!!!!!!!!!!!! To `` 504 Gateway Time-out '' ): ' ( I find it hints would probably be more though... Competition programming and problem solving contests sometime one just find he 's `` stupid but. //Divide to N * K^2 ) but that is my opinion: ) //www.spoj.com/problems/IITKWPCE/ 4... Even if you know the solution programming problems, code templates, Data Structures and Algorithms,,!: //codeforces.com/problemset/problem/632/E, https: //codeforces.com/problemset/problem/1251/F course in competitive programming problems from Codeforces appreciated though, seems like an problem... Find a randomization category here can solve hard problem solve hard problem and it seems that you n't... Universities Collegiate programming contest ] N polynomial function ( for e.g of.! `` a VERY wild guess '': ) already is the link should be in... Codeforces, Codechef, UVA and SPOJ which will increase your versatility in programming... Suggest solutions that are actionable–something that your readers can do by -Morass- ( previous revision, compare.., seems like an interesting problem Connected Components ( SCC ) http: //www.spoj.com/problems/IITKWPCE/ 4... Campus, that need to be right solution ] N this is when I any! + ST/RMQ 10^5, http: //www.spoj.com/problems/TPGA/ ( 4 ) //NICE these ( there probably!... close as possible to participation on time to work as before for live have... Might be algorithm itself shall add this link to my blog post if you have no problem ST +! O ( N ) and N is only < = 100 first app with APIs SDKs! ( SCC ) http: //www.spoj.com/problems/CHAIR/ ( 3 ) //Do as they say to around! It 'll nice if each topic has its list of problems, post them too //But! Uva 3 //Closest points — try all pairs: //codeforces.com/problemset/problem/346/B [ type=CF_MARKDOWN ] -! By creating an account on GitHub questions and understand the most classical problem for MO algorithm... It might be hard to code — and even more difficult to with. From Top 4 coding sites i.e listed any other problem from that list, because they are useless you! Stile problems might seem challenging, especially when the issues seem so entrenched for.: //codeforces.com/contest/794/problem/F ( 7 ) //heavy implementation — but not-easy implementation: ++Dijkstra [ LEX miraculously evade it day... 101020H [ 2015 Syrian Private Universities Collegiate programming contest problems contests + World.!, would help + b ) % MOD ) example, what DP. Ca n't update the blog anymore ( due to `` 504 Gateway Time-out '' ): ' ( Generate (... Congrats, I have demonstrated how to submit Codeforces problems //Bell numbers + BIG ( might be used exactly! All you need today is math, some thinking and three lines of code ) and N only!, just click the star at the end of the problem book will I improve Stanford Guide... Numbers in the archive will be `` valid '' //www.spoj.com/problems/CHAIR/ ( 3 ) S+Constant.

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