As Couponxoo’s tracking, online shoppers can recently get a save of 50% on average by using our coupons for shopping at Codeforces Problem By Topic . Stream on up to 2 screens at a time. 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 → line, Connect i → N-2: star, http://www.spoj.com/problems/CAC/ (5) //VERY NICE! ], https://www.hackerrank.com/contests/mathemagic-bits/challenges/degree-diameter-on-trees [accesable? If I would miraculously evade it one day, I'll add those problems. A warning: the last problem is much harder than the others . If I solve all the problems mentioned in that book will I improve? Did you simply miss HLD or it's there but I can't find it? ], 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. for example, graphs, geometry etc. Login; Register; User Editorials : Search Friends ... Leaderboard: Trending Problems: Submission Filters: Testimonials: Feature Updates: Find Me Problems. 14:00 . Thank You For Watching, Happy Coding . In this course, you will learn about the various important Coding Questions asked in competitions conducted on platforms like Codechef, Codeforces, HackerBlocks etc. I wrote a script to save all these questions along with their categories in a CSV file using python. and Now I want to solve Problems in CF about graphs. Thanks a lot for these! 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. http://www.spoj.com/problems/NTHPRIME/ (7) // BS + NumPrime GOOD!! ), Unfortunatelly it is not much possible imho :'(. ], 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). 6584 — Escape (8) //[VERY VERY VERY NICE][COMPRESSION][MERGING] //Hard but I recommend this one!! 6:59. 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. 7988 Flow Shop (3) //Do as they say. by number, http://codeforces.com/contest/776/problem/E (6) //vypsat cisla: f(N)=Phi(N),g(N)=N. Codedigger provides you handpicked problems from top 4 coding sites i.e. Sort + Fenwick, http://www.spoj.com/problems/DCEPC206/ (3) //NICE & EASY, http://www.spoj.com/problems/KOPC12G/ (4) //N Fenwick trees, http://www.spoj.com/problems/TRIPINV/ (4) //2xFenwick (triples counting), http://codeforces.com/contest/597/problem/C (4) //[VERY NICE] 11*Fenwick, http://codeforces.com/contest/12/problem/D (4) //NICE [triplet-comparing][sort], https://www.spoj.com/problems/NARHIL/ // Sugested by ak07_, https://toph.co/p/play-the-lottery (7) //[VERY NICE][D&C][MODULAR], Gym 100960C [2015-2016 Petrozavodsk Winter Training Camp, Nizhny Novgorod SU Contest], https://www.codechef.com/problems/POLYEVAL, http://codeforces.com/contest/827/problem/E (8) //MAGIC, http://www.spoj.com/problems/MAXMATCH/ 5 //abc hamming, https://www.spoj.com/problems/DISGRAPH/ (5) //Stoer-Wagner [global], https://codeforces.com/gym/101981 I //[NICE], http://codeforces.com/gym/101982 E //[VERY NICE][GRID], http://codeforces.com/gym/101845/problem/F (4) //Basic, http://codeforces.com/gym/101908/problem/G (4) //[NICE][MATCHING][BS], http://www.spoj.com/problems/FASTFLOW/en/ //Raw (no sauce), http://codeforces.com/contest/78/problem/E (5) //NICE [Matching-like][+BFS], 4322 — Destroying the bus stations (Live Archive), 11380 — Down Went The Titanic (UVA) //Interesting grid problem, 6395 — Surely You Congest (LA) //VERY NICE [slightly advanced], http://codeforces.com/gym/100963 (Flame of Nucleus — F), 11167 — Monkeys in the Emei Mountain //Also harder (imho), http://codeforces.com/problemset/problem/653/D (+BS), https://www.deadline24.pl/assets/problemsets/dl24.elim.2017.B.en.pdf (DEADLINE 24 problem — not sure if it can be submited :O), http://codeforces.com/problemset/problem/727/D, http://codeforces.com/problemset/problem/704/D [Also advanced], 4957 — Fake scoreboard (LA) //If I remember well, other solutions was also possible, 1155 — Power Transmission (LOJ) //(classical), https://www.codechef.com/problems/ROBOTDAG //Ford-Fukherson, 11506 — Angry Programmer (UVA) //Nodes division, 10092 — The Problem with the Problem Setter, Problem B. Roller Coaster Scheduling (GCJ — 2017), 5905 — Pool construction (LA) //Imho harder, http://codeforces.com/contest/808/problem/F 6 //NICE — nontrivial (max matching with bigger flows), http://codeforces.com/contest/847/problem/J 6 //Probably not flows — matching-like, http://www.spoj.com/problems/ADAHOSE/ [DUAL-GRAPH], http://codeforces.com/contest/903/problem/G (6) //[VERY NICE][SEG-TREE][CUT], http://www.spoj.com/problems/ADABLOOM/ //Maximum matching in general graph, 11439 — Maximizing the ICPC //Maximum matching in general graph, 1376 — Animal Run //Max flow on planar graph (Dual == shortest path over edges), 10989 — Bomb, Divide and Conquer //Stoer-Wagner — global cut, https://codeforces.com/contest/1202/problem/B (3) //[VERY NICE], http://codeforces.com/gym/101845/problem/C, https://www.urionlinejudge.com.br/judge/en/problems/view/2676 (3) //simple FW, http://codeforces.com/problemset/problem/21/D, http://www.spoj.com/problems/INGRED/ //+DP, Gym 101223C [2017 Facebook Hacker Cup, Round 1] //+DP, http://www.spoj.com/problems/ARBITRAG/ //Other algos shall work too, http://www.spoj.com/problems/ROHAAN/ (3) //Classical, http://codeforces.com/contest/25/problem/C (4) //Adding new edges .. need FW principal, http://codeforces.com/contest/33/problem/B (3) //NICE [dijkstra could work too], http://www.spoj.com/problems/ADAGAME/ [DP], https://codeforces.com/contest/1194/problem/D (4) //[OBSERVATIO][PATTERN], https://codeforces.com/contest/1191/problem/E (4) //[NICE][IF][OBSERVATION], https://www.spoj.com/problems/HUSGAME/ (4) //[VERY NICE][OBSERVATION][RECURSION], https://www.spoj.com/problems/IBIGAME/ (5) //[VERY NICE][OBSERVATION][DP], https://codeforces.com/gym/102058/problem/F (4) //[NICE], http://codeforces.com/gym/101801 F //[EASY][OBSERVATION][NIM], http://codeforces.com/gym/101908/problem/B (5) //[NICE][NIMBERS][OBSERVATION], http://codeforces.com/gym/101873 H //[VERY NICE][OBSERVATION][TREE] //LUP LUP, http://codeforces.com/gym/101808/problem/I (5) //[DP][OBSERVATION], http://codeforces.com/contest/919/problem/F (6) //[NICE][HARD][IMPLE][BFS][TOPO][GRAF], http://codeforces.com/contest/918/problem/D (4) //[NICE][DAG][DP][TREE], http://codeforces.com/contest/914/problem/B (3) //[NICE][EASY][OBSERVATION][PARITY], http://codeforces.com/contest/148/problem/D (4) //[EASY][DP][PROBABILITY], http://codeforces.com/contest/138/problem/D (7) //[VERY NICE][DP][OBSERVATION], https://arc087.contest.atcoder.jp/tasks/arc087_c (5) //[VERY NICE][TRIE][SEQUENCE], http://codeforces.com/contest/120/problem/E (3) //[NICE][SYMETRY][PARITY], http://codeforces.com/contest/88/problem/E (5) //[VERY NICE][PREFIX-XOR][NIMBERS][SQRT][MATH], http://codeforces.com/contest/69/problem/D (4) //[NICE][DP] Reflection can be ignored, http://codeforces.com/contest/55/problem/C (4) //[NICE] Size of piece from border, http://codeforces.com/problemset/problem/255/E --MEX, https://devskill.com/CodingProblems/ViewProblem/91, https://devskill.com/CodingProblems/ViewProblem/364, http://www.spoj.com/problems/VECTAR11/ 4 //Nsqrt(N) passes [with break], http://codeforces.com/contest/768/problem/E (4) //NICE — Grundy, http://www.spoj.com/problems/SYNC13C/ (4) //2*DP {maybe not seeing sth}, http://codeforces.com/contest/787/problem/C (4), http://codeforces.com/contest/794/problem/C (3) //Find optimal strategy: choose back/front, http://codeforces.com/contest/794/problem/E (5) //NICE Find stategy: Even/Odd, http://codeforces.com/contest/812/problem/E (7) //Advanced NIM strategy, http://www.spoj.com/problems/GAMEMVS/ (4) //Nimbers (Ai^X)<=Ai, http://www.spoj.com/problems/PLAYGAME/ (3) //Check pattern, http://www.spoj.com/problems/CHAOS_CC/ (4) //VERY NICE [nimbers], http://codeforces.com/contest/851/problem/E (5) //Very nice [nimbers] [bitset], http://www.spoj.com/problems/CHGROOM/ (4) //+Factorisation [NICE & Easy]: Win unless 2 prime factors, http://www.spoj.com/problems/EALP1/ (4) //NICE ~ Possible Moves of NIM, http://www.spoj.com/problems/GAME3/ (4) //VERY NICE — pattern watching [A145812], http://www.spoj.com/problems/GAME2/ (5) //VERY NICE — https://community.topcoder.com/tc?module=Static&d1=match_editorials&d2=srm338 (CAKE), http://www.spoj.com/problems/CF36D/ (5) //Pattern watching (care for 1), http://codeforces.com/contest/15/problem/C (4) //VERY NICE [XOR: A,1,A+1,0..repeat], http://codeforces.com/contest/39/problem/E (4) //Slightly [DP][MATH][ROUNDING], http://codeforces.com/contest/63/problem/E (5) //[NICE][BITMASK-DP], http://codeforces.com/gym/100923/problem/C, Gym 100962A [2015-2016 Petrozavodsk Winter Training Camp, Moscow SU Trinity Contest][NICE], https://codeforces.com/contest/1199/problem/B (2) //[NICE][SIMPLE], https://codeforces.com/gym/101991/problem/J (5), https://codeforces.com/gym/101991/problem/B (4), https://codeforces.com/gym/102006/problem/I (4) //[VERY NICE][ITERATIVE], https://codeforces.com/gym/102021 G //[3D], https://codeforces.com/gym/102021 B //Path on circle, https://codeforces.com/gym/102058/problem/K (3) //[BRUTE-FORCE][FAIL], https://codeforces.com/gym/101972/problem/C (4) //[EASY][POINTS DISTANCE][IMAGE], http://codeforces.com/gym/101628/problem/C (4) //Circles intersection. (26), http://codeforces.com/contest/767/problem/E (6), http://codeforces.com/contest/637/problem/B (3) //NICE pro prvaky, http://codeforces.com/contest/777/problem/B (3) // -||-, http://codeforces.com/contest/777/problem/D (3) //just go from end, http://codeforces.com/contest/779/problem/C (3) //NICE pro prváky, http://www.spoj.com/problems/SPCU/ (2) //Easy — zamysleni (max int = index), http://www.spoj.com/problems/LOPOV/ (4) //sort + queue (or just queue) NICE, http://codeforces.com/contest/792/problem/E (5) //T%S<=T/S + check proper, http://codeforces.com/contest/807/problem/E (5) //NICE — put asice P2 / rest — greedy from small, http://codeforces.com/contest/799/problem/E (5) //Many queues — but NICE, http://codeforces.com/contest/808/problem/C (3) //EASY, http://codeforces.com/contest/802/problem/B (4) //Priority by "next", http://codeforces.com/contest/813/problem/A (1) //Zahrivacka pro prvaky, 10716 UVA (4) //NICE — always find closest pair, http://codeforces.com/contest/816/problem/C (3) //NICE — greater

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