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Codedigger provides you handpicked problems from top 4 coding sites i.e. ], 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). 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. 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. What does "L-mex" stand for in the segment tree section? Archived. However I'm still getting TLE. Also during all phases, it is good (even thougt one spends a lot of time by coding) spend some time by reading: a) New algorithms helpful things b) Editorials for what one doesn't know (firstly THINK about the problems and if nothing come, search for solution. No clue how the problem tag you mentioned, of DAG, would help. Good Day to you!↵ ↵ I've been asked to make some topic-wise list of problems I've solved. https://www.codechef.com/problems/CHEFNUMK, https://www.hackerearth.com/problem/algorithm/harry-gets-into-infy-1/description/, http://www.spoj.com/problems/COT/ (7) //ON TREE [but very tight TLE], http://www.spoj.com/problems/GOT/ (5) //ON TREE, http://www.spoj.com/problems/CPAIR2/ (4) //MO + Fenwick [VERY NICE], http://www.spoj.com/problems/HRSIAM/ (5) //With updates, http://www.spoj.com/problems/KDOMINO/ (4) //NICE — Frequencies, https://codeforces.com/contest/1187/problem/B (3) //[NICE], 13257 — License Plates UVA //Brute-Force 26^3 queries in O(1), http://codeforces.com/contest/92/problem/C (3) //[VERY NICE], https://www.codechef.com/problems/ASTRING, http://codeforces.com/problemset/problem/701/C, http://www.spoj.com/problems/STRSEQ/ //+DP, http://codeforces.com/problemset/problem/762/C, http://codeforces.com/problemset/problem/724/D, http://www.spoj.com/problems/SUBSN/ //+BS, https://www.hackerrank.com/contests/world-codesprint-5/challenges/short-palindrome //+DP, http://codeforces.com/gym/101908/problem/J (6) //[VERY NICE][STEINER][GEOMETRY], http://codeforces.com/gym/101666 G //[NICE][BURTE FORCE][OBSERVATION][SUBSETS], http://codeforces.com/contest/907/problem/E (5) //[VERY NICE][CLIQUE][DP], http://codeforces.com/contest/114/problem/B (3) //[CLIQUE][BRUTE-FORCE], http://www.spoj.com/problems/JOHNNY/ //Not exact — points, http://www.spoj.com/problems/TAKIN/ (3) //[KNAPSACK][RECURSION], http://codeforces.com/contest/839/problem/E (5) //NICE! What according to you should I do to improve my skills? So well, sorry this didn't help you much, but that is my opinion :). http://www.spoj.com/problems/PHT/ (2) //easy BS (NN+2N) mby math? (4) //boring problem, http://codeforces.com/contest/900/problem/A (1), http://codeforces.com/contest/122/problem/A (1) //Find all lucky, http://codeforces.com/contest/120/problem/B (1) //Iteration, http://codeforces.com/contest/120/problem/A (1) //Iff/Logic, http://codeforces.com/contest/118/problem/B (2) //[PRINTING], http://codeforces.com/contest/108/problem/A (1) //[EASY][PRINT][TIME], http://codeforces.com/contest/106/problem/A (1) //Iff-party, http://codeforces.com/contest/890/problem/A (1) //if or perm, http://codeforces.com/contest/90/problem/B (2) //No idea — just cycles, http://codeforces.com/contest/75/problem/A (1) //conversion, http://codeforces.com/contest/884/problem/B (1) //Simple sum +N-1, http://codeforces.com/contest/48/problem/A (1) //Very easy [fe. Yes it is out of 10 (even thought — I think I've never used such big number :P) [but again.. it is just estimation, so might not be absolutely correct :) ], can you give an estimate that what will be my rating like if I solve questions till level a)5 b)6 c)7 d)8(will take a long time to reach here. Codeforces Problem's Solution. Problem Name: Pair of Topics. Site: CodeForces: Links: Problem. Some of them are marked by a number (by which I've tried to estimate the difficulty). 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. Even though I couldn't involve all problems, I've tried to involve at least "few" problems at each topic I thought up (I'm sorry if I forgot about something "easy"). Hey there! EAT CODE SLEEP REPEAT. So please everyone that have a collection of Graphs Problems (DFS,BFS,LCA,Dijkestra,...) Share that with me. 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. Good Day to you! https://www.hackerrank.com/contests/world-codesprint-7/challenges/elastic-rope/problem, https://devskill.com/CodingProblems/ViewProblem/20 [EASY], 3378 — Swamp Things [LA] — Maximum points on line, https://www.codechef.com/problems/ALLPOLY //[NICE] Point seeing polygon, http://www.spoj.com/problems/IITKWPCL/ //Point distance, LightOJ 1018 //Minimum # of lines through all pts [VERY NICE], UVA 12830 //Biggest rectangle without points inside, http://www.spoj.com/problems/AMR12C/ //Pt closest to all other points, http://www.spoj.com/problems/CLOPPAIR/ //Closest pair of points, http://codeforces.com/problemset/problem/600/D //Circles intersection, http://www.spoj.com/problems/CERC07C/en/ //Bounding circle, LightOJ 1130 //Circle x Rectangle intersection, http://codeforces.com/problemset/problem/610/D //Lines intersections (axes parallel), http://codeforces.com/problemset/problem/681/E //Circles intersection, http://codeforces.com/problemset/problem/793/C //Intersection ans similar, Gym 100190I [2011 ACM-ICPC East Central North America (ECNA 2011)] //Segment intersection, http://codeforces.com/gym/100917/problem/K, http://www.spoj.com/problems/SICRANO/ //Point-line distance, http://codeforces.com/problemset/problem/614/C //Point-line distance, https://www.hackerrank.com/contests/booking-hackathon/challenges/nearby-attractions/problem //Pt sphr, 11265 UVA 6 //Nice one | polygon — cut/pt-check/area, 11177 UVA 6 //BS+Polygon/Circle intersection, 11008 UVA 5 //with DP → #intersected triangles, 11012 UVA 5 //Nejvzdálenější body (Manhatton 3D), http://codeforces.com/problemset/problem/682/E 6 (biggest triangle), http://codeforces.com/contest/672/problem/C 4 //easy — just think it up, http://codeforces.com/contest/667/problem/A 2 //vzorecky, http://codeforces.com/contest/793/problem/C 5 //EASY but beware of epsilons (NICE), http://codeforces.com/contest/794/problem/B 2 //Can be done with BS, http://codeforces.com/contest/814/problem/D 5 //+DP on trees (NICE — but low geom. You can easily go through the editorial link to see the editorial, which is placed at the right bottom corner of the problem page. This repository is a notebook consisting of all my solutions to questions from CodeForces. Codeforces 339A Helpful Maths (greedy implementation sortings strings water problem) Last Update:2018-07-26 Source: Internet Author: User. http://www.spoj.com/problems/DCEPC11B/ (5) //Wilson't theorem! 7703 — Reading Digits (2) //Simple simulate what they ask for, http://codeforces.com/contest/893/problem/A (1) //Easy but nice, http://codeforces.com/contest/102/problem/B (2) //Do as they write — log-convergence, http://codeforces.com/contest/92/problem/A (1) //Way too easy, http://codeforces.com/contest/88/problem/C (3) //[NUMBER THEORY], http://codeforces.com/contest/84/problem/D (4) //Priority queue by min*size, http://codeforces.com/contest/79/problem/A (1) //Simulate rules, http://codeforces.com/contest/879/problem/A (1) //Iterate day-by-day, http://codeforces.com/contest/879/problem/B (3) //Either at most N^2 or the biggest element [NICE], http://codeforces.com/contest/879/problem/D (4) //[NICE][Array elimination], http://codeforces.com/contest/46/problem/A (2) //[EASY][MODULO], http://codeforces.com/contest/46/problem/B (3) //[EASY][SEARCH-EACH-QUERY], http://codeforces.com/contest/55/problem/A (2) //Simple (long) simulation, http://codeforces.com/contest/60/problem/A (1) //Moving LR bounds, http://codeforces.com/contest/724/problem/C 5, http://codeforces.com/contest/746/problem/C 3, http://codeforces.com/contest/768/problem/C (4), http://www.spoj.com/problems/WRONG/ (5) //VERY NICE — precalculate from back, then go from front, http://codeforces.com/contest/864/problem/C (4) //Not nice — just iffs, http://www.spoj.com/problems/WAGE/ (3) //Simple Game Of Life Modification, http://codeforces.com/contest/6/problem/C (2) //Simple simulate from both sides, http://codeforces.com/contest/9/problem/B (2) //Simulate what is given (+ doubles), http://codeforces.com/contest/11/problem/B (3) //sqrt(X) [diff must be even], http://codeforces.com/contest/30/problem/A (2) //Simply simulate process [-1000→ 1000], https://codeforces.com/contest/1174/problem/B (3) //[OBSERVATION] Nice yet simple, https://codeforces.com/contest/1174/problem/A (2) //[EASY], https://codeforces.com/contest/1203/problem/E (4) //[GREEDY][SIMPLE], https://codeforces.com/contest/1203/problem/B (3) //[GREEDY][NICE], https://codeforces.com/contest/1185/problem/D (4) //[BF][IMPLE][MATH], https://codeforces.com/contest/1185/problem/C1 (3) //[GREEDY], https://codeforces.com/contest/1197/problem/C (4) //[NICE][EASY][OBSERVATION], https://codeforces.com/contest/1197/problem/A (3) //[SIMPLE][GREEDY][MATH], https://codeforces.com/contest/1189/problem/B (3) //[EASY][OBSERVATION], https://www.spoj.com/problems/SWAPDIFF1/ (4) //[CLASSICAL][INVERSIONS], https://www.spoj.com/problems/SHINCARD/ (4) //[NICE], https://www.spoj.com/problems/POTATOPL/ (4) //[NICE][GREEDY], https://codeforces.com/gym/101991/problem/I (3), http://codeforces.com/gym/101962/problem/M (4), http://codeforces.com/gym/101726/problem/E (3) //[STRUCTURES][IMPLEMENTATION], 8260 Installing Apps (4) //[NICE] //Sorting + some DP, http://codeforces.com/contest/922/problem/D (3) //[NICE][GREEDY][EASY], http://codeforces.com/contest/920/problem/C (3) //[EASY] Sortable by parts, http://codeforces.com/contest/913/problem/D (4) //[NICE][BS][2P][FW], http://codeforces.com/contest/149/problem/A (2) //Sorting|Greedy, http://www.spoj.com/problems/SEUG/ (2) //Bad statement, http://codeforces.com/contest/141/problem/A (2) //Or frequency, http://codeforces.com/contest/137/problem/E (4) //[NICE][PREFIX SUM MATCHING], http://codeforces.com/contest/137/problem/C (4) //[NICE][FENWICK WORKS TOO], http://codeforces.com/contest/136/problem/C (3) //Last to 1(2) |OR| first to INF, 7673 — What a Simple Research (2) //[EASY][IMPLE], http://codeforces.com/contest/108/problem/B (2) //Easy & Adjacent, http://codeforces.com/contest/892/problem/A (2) //[EASY][SUM], https://www.urionlinejudge.com.br/judge/en/problems/view/2290 (3) //Sort+check [fast], http://codeforces.com/contest/81/problem/C (3) //MATH[Lesser=greater][comparator], http://codeforces.com/contest/53/problem/D (3) //Bubble sort, http://codeforces.com/contest/58/problem/D (4) //[BUCKET][GREEDY][STRING], http://codeforces.com/problemset/problem/645/B //INV, http://www.spoj.com/problems/BUBBLESORT/ //INV, http://www.spoj.com/problems/CODESPTB/ //INV, http://codeforces.com/problemset/problem/749/E //INV, http://codeforces.com/contest/731/problem/D 7, http://codeforces.com/contest/747/problem/D (4). I, then, made a resolution to be at least candidate master before I stop practicing religiously. You can visit and start solving at codedrills.io.This site will remain at this new address recommender.codedrills.io and will continue to work as before. How do you create high quality problems for participants above your skill level? Solution of competitive programming problems, code templates, Data Structures and Algorithms, hackathons, interviews and much more. Repository of solutions of various competitive programming problems solved on Codeforces and AtCoder. Or if anyone know any source? What Tag I should add if I want problems related to segments (like finding union, intersections...etc) or swipe line technique? Also, as you can see, my progress is not that good so maybe it would be better to ask some red-coder (or nutela). This topic stands for Big Integer — so problems with numbers which doesn't fit in 264 :). ", what is its actual id by which I can submit the problem? ], http://www.spoj.com/problems/RIOI_3_2/ (5) //VERY NICE (easy imple — Number Theory thinking), http://www.spoj.com/problems/MAXWOODS/ (3) //NICE [EASY][GRID], http://www.spoj.com/problems/DIEHARD/ (3) //Easy — prolly solvable by greedy (but dp is easier), http://www.spoj.com/problems/DCEPC810/ (4) //VERY VERY NICE — Subsequence 2pointers+2bools, http://www.spoj.com/problems/EQ2/ (4) //NICE: Digit + Carry (from back) — iff-party, http://www.spoj.com/problems/DCEPC501/ (3) //NICE & EASY, http://www.spoj.com/problems/NUMTSN/ (4) //NICE — Thinking or Opti, http://www.spoj.com/problems/GONE/ (4) //NICE & EASY [digits], http://www.spoj.com/problems/RAONE/ (4) //NICE & EASY [digits] — almost similar as above, http://www.spoj.com/problems/STRSEQ/ (4) //VERY VERY NICE — Next-Function, http://www.spoj.com/problems/MYQ8/ (4) //VERY NICE — 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) — iterate by sum, http://www.spoj.com/problems/ABCPATH/ (3) //DP over dfs (maybe without dp works too? ], https://www.codechef.com/problems/KBIGNUMB, http://codeforces.com/problemset/problem/718/C, http://codeforces.com/problemset/problem/621/E, Project Euler #114: Counting block combinations I, http://codeforces.com/problemset/problem/821/E, https://www.codechef.com/AUG16/problems/SHAIKHGN //Not exactly but similar principle, 10743 UVA (5) //A001169 [easy multi / hard to come with recurence], http://codeforces.com/contest/821/problem/E (6) //Not trivial to come-up with matrix, http://www.spoj.com/problems/DCEPCA06/ (4) //NICE — 10x10 matrix, http://www.spoj.com/problems/GSWORDS/ (3) //NICE&EASY — 3-states "OO,OX,XO", http://www.spoj.com/problems/TETRAHRD/ (4) //Easy + Sum, http://www.spoj.com/problems/NACCI/ (4) //Classical (N-Bonacci), http://www.spoj.com/problems/JZPCIR/ (5) //VERY NICE: A137726, https://www.urionlinejudge.com.br/judge/en/problems/view/1617 (4) //[BASIC], 13288 — Cordon Bleu (6) //[NICE][MATCHING], http://codeforces.com/gym/100800 (Aqueduct Construction — A), http://codeforces.com/contest/863/problem/F (5) //VERY NICE, http://codeforces.com/contest/802/problem/C (8) //Nice but hard to see + negative, http://codeforces.com/contest/802/problem/N (5) //Easy but faster MCMF needed, http://codeforces.com/contest/818/problem/G (6) //NICE + MUCH Faster MCMF, http://www.spoj.com/problems/BNMT/ (7) //VERY NICE (some optimalisations needed + weird data set), http://codeforces.com/contest/884/problem/F (6) //Alphabetical buckets, http://codeforces.com/contest/713/problem/C 7, http://www.spoj.com/problems/RMID/ 3 (as above just not so dynamic), http://www.spoj.com/problems/EC_ESTA/ 4 //classical dynamic median, http://www.spoj.com/problems/DCEPCA09/ (6) //VERY NICE [MO +++ MEDIAN, MEAN, FREQ], http://codeforces.com/contest/912/problem/E (5) //[VERY NICE][BS][2P][PRIMES], http://codeforces.com/contest/888/problem/E (4) //NICE[EASY], http://codeforces.com/contest/51/problem/E (6) //NICE[GRAPH][Cycles of length 5], https://devskill.com/CodingProblems/ViewProblem/245, https://devskill.com/CodingProblems/ViewProblem/256, http://www.spoj.com/problems/COLOR_CC/ (4) //VERY NICE — div by partity (take lesser) → 8^6, http://www.spoj.com/problems/ADAUNIQ/ [Updates], https://www.spoj.com/problems/MOZHSLS/ (5) //[VERY NICE], http://www.spoj.com/problems/ADAFTBLL/ [Tree][Updates], http://codeforces.com/gym/101879/problem/H (5) //[NICE][CLASSICAL][FREQUENCIES][FENWICK][BS], http://codeforces.com/contest/86/problem/D (4) //[NICE][CLASSICAL], http://codeforces.com/contest/877/problem/F (6) //[NICE][NORMALIZE], http://codeforces.com/problemset/problem/687/D, http://codeforces.com/problemset/problem/617/E, https://www.codechef.com/problems/DISTNUM3 //Tree + Update. & Hokkaido University Contest 2020, New problems (for December) added [monthly update], New problems (for November) added [monthly update]. and Now I want to solve Problems in CF about graphs. Can you please tell what are the problems from LA are?? I've alredy made such list once anyway I've tried to include more problems now — so here it is: http://www.spoj.com/problems/SUB_PROB/en/, http://codeforces.com/contest/696/problem/D 8, http://www.spoj.com/problems/AHOCUR/ 5 //Aho-Corassic + DP, https://www.codechef.com/problems/LYRC (5) //Sample aho-brute-force, http://codeforces.com/problemset/problem/346/B //Proposed by bradyawn, http://www.spoj.com/problems/STRMATCH/ //Suffix Automat — trie might do too, http://www.spoj.com/problems/NSUBSTR2/ //Suffix Automaton, http://www.spoj.com/problems/ARBITRAG/ (4) //Or Floyd-Warshall, http://www.spoj.com/problems/ADACYCLE/ [FW], UVA 13295 (6) //[NICE][EFFICIENCY][IMPLEMENTATION], http://codeforces.com/gym/101992/problem/H (4) //[VERY NICE][MAX], 6151 — Beehives (4) //[NICE] //Search for shortest cycle, https://devskill.com/CodingProblems/ViewProblem/60, https://devskill.com/CodingProblems/ViewProblem/150, 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 — but not main technique ... ++ DP /or/ MCMF, http://codeforces.com/contest/821/problem/D (5) //VERY NICE — Consider only points not GRID, http://www.spoj.com/problems/DIGOKEYS/ (4) //Easy [Nice problem — 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://codeforces.com/contest/59/problem/E (5) //[NICE][DOUBLE-STATES][SET], http://codeforces.com/contest/877/problem/D (4) //[NICE] Add vector to # of states, 4291 — Sculpture (6) //[NICE][PREPROCESS][NORMALIZE], 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 — KNIGHT, http://www.spoj.com/problems/PUCMM223/ (4) //NICE (but not many languages) — 2 moving [x][y], http://www.spoj.com/problems/SPIRALGR/ (4) //NICE (not typical) [SIEVE], http://www.spoj.com/problems/DCEPC706/ (4) //NICE — travelling outside, http://codeforces.com/contest/35/problem/C (3) //No obstacles [multiple starts], https://devskill.com/CodingProblems/ViewProblem/394 (2) //Multiplication (or math), http://codeforces.com/contest/66/problem/A (2) //Big + iffs + implementation, http://codeforces.com/problemset/problem/18/D, https://www.hackerrank.com/contests/projecteuler/challenges/euler025, https://www.hackerrank.com/contests/projecteuler/challenges/euler020, Gym — 100866A [ACM ICPC 2005–2006 NEERC Moscow Subregional Contest], 10070 — Leap Year or Not Leap Year and .. [UVA], http://www.spoj.com/problems/IWGBS/ [UVA], http://www.spoj.com/problems/POP3/ [Prime-Test], http://www.spoj.com/problems/MINNUM/ 3 // BIG/9+!! [ld], http://codeforces.com/contest/18/problem/A (2) //EASY&FINE: Pythagoreas, http://codeforces.com/contest/40/problem/A (2) //[EASY][DISTANCE], https://codeforces.com/contest/1182/problem/D (5) //[CENTRUM][OBSERVATION][DFS], https://www.urionlinejudge.com.br/judge/en/problems/view/1562 (5) //[VERY NICE][QUEUE][GREEDY], https://codeforces.com/gym/102001/problem/G (4) //[NICE][BS], https://codeforces.com/gym/102006/problem/G (4) //[NICE][TOPOSORT][OBSERVATION], https://codeforces.com/gym/102058/problem/B (6) //[VERY NICE][REVERSE-SIMULATION], http://codeforces.com/gym/101666 H //[VERY NICE][GEOMETRY][DSU][EULER][PLANAR], http://codeforces.com/contest/27/problem/D (5), http://www.spoj.com/problems/VFRIEND2/ (5) //Graph possible check, http://codeforces.com/contest/859/problem/E (4) //VERY NICE (2 cases: CYCLE [x2] / TREE [x(Size+1)], http://codeforces.com/contest/847/problem/C (2) //Forest making Easy&Nice, http://codeforces.com/contest/863/problem/C (3) //Cycle in states, https://codeforces.com/contest/1175/problem/D (4) //[NICE][PREPROCESS][SORTING], https://codeforces.com/contest/1203/problem/F1 (5) //[VERY NICE][SORTING][CASES], https://codeforces.com/contest/1176/problem/C (3) //[SIMPLE][NICE][IMPLE], https://codeforces.com/contest/1176/problem/A (1), https://codeforces.com/contest/1200/problem/B (3) //[SIMPLE][NICE], https://codeforces.com/contest/1202/problem/A (2), https://codeforces.com/contest/1181/problem/B (4) //[BIG], https://atcoder.jp/contests/abc136/tasks/abc136_c (3) //[REVERSE], https://codeforces.com/contest/1185/problem/C2 (4), https://codeforces.com/contest/1185/problem/B (2) //[EASY], https://codeforces.com/contest/1180/problem/B (3) //[IMPLEMENTATION][MATH], https://codeforces.com/contest/1186/problem/D (4) //[IMPLEMENTATION], https://codeforces.com/contest/1197/problem/B (3) //[BITONIC][IMPLE], https://www.spoj.com/problems/DIVSTR/ (3) //[CUTE], https://codeforces.com/gym/101981 E //[NICE][NORMALIZE][STACK], https://codeforces.com/gym/102001/problem/L (3) //[BITS], http://codeforces.com/gym/100112 (3) //[FINE], http://codeforces.com/gym/101666 (4) //[NICE][QUEUE][DFS][EVENTS], http://codeforces.com/gym/101806/problem/T (5) //[NICE][SEGMENT TREE][SORTING], http://codeforces.com/contest/916/problem/B (3) //[BITS] FIRST & LAST, http://codeforces.com/contest/913/problem/C (3) //+[DP], http://codeforces.com/contest/146/problem/D (4) //[NICE][CONSTRUCTION], http://codeforces.com/contest/146/problem/C (3) //[EASY][NICE][TWO-CASES], http://codeforces.com/contest/139/problem/D (4) //Muchas cases, 7887 — Back to the Future (4) //[NICE][2*HEAP], http://codeforces.com/contest/910/problem/A (2) //DP works too, http://codeforces.com/contest/125/problem/D (4) //Limited possibilities, http://codeforces.com/contest/902/problem/A (2) //Just keep last, http://codeforces.com/contest/898/problem/D (4) //[NICE][FENWICK/OR/PREFIX], http://codeforces.com/contest/118/problem/C (4) //[NICE] — Try each digit (iterate in waves), 7706 — Pokemons (2) //Sweep and keep maximum, http://codeforces.com/contest/893/problem/D (4) //[NICE][SWEEP][MAXIMUM] — pay max when have to, http://codeforces.com/contest/892/problem/B (2) //Sweep from back, http://codeforces.com/contest/102/problem/C (3) //sort by frequency, https://devskill.com/CodingProblems/ViewProblem/419 (2) //Sweep from back, http://codeforces.com/contest/890/problem/C (3) //frequence, http://codeforces.com/contest/890/problem/B (2) //[EASY][REVERSE], http://codeforces.com/contest/888/problem/B (2) //Equalize U/D and L/R, http://codeforces.com/gym/101597/problem/J (4) //[NICE][SWEEP], http://codeforces.com/contest/76/problem/B (4) //[NICE][MATCHING-LIKE][2PTRS], http://codeforces.com/contest/73/problem/B (4) //[IMPLEMENTATION][SORTING], http://codeforces.com/contest/883/problem/K (4) //Nice — Two sweeps, http://codeforces.com/contest/49/problem/D (3) //NICE — 1010101 OR 0101010 [haming], http://codeforces.com/contest/58/problem/C (4) //NICE — group trees by slopes, http://codeforces.com/contest/729/problem/D 3, http://codeforces.com/contest/729/problem/E 4, http://codeforces.com/contest/725/problem/D 4, http://codeforces.com/contest/725/problem/F 9, http://codeforces.com/contest/732/problem/E 5, http://codeforces.com/contest/727/problem/F 6, http://codeforces.com/contest/724/problem/D 5, http://codeforces.com/contest/723/problem/C 4, http://codeforces.com/contest/719/problem/B 2, http://codeforces.com/contest/712/problem/C 3, http://codeforces.com/contest/746/problem/E 5, http://codeforces.com/contest/746/problem/D 3, http://codeforces.com/contest/749/problem/C 3, http://codeforces.com/contest/884/problem/D (4) //PQ or Sort, http://www.spoj.com/problems/SQRMINSUM/ 3 //solve-able in O(N+M)-arrayqueue, http://www.spoj.com/problems/MSCHED/ 3 //sweep from back, http://www.spoj.com/status/ns=18780683 4 //all perm + A**
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