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Problems

Note that you can solve most task in any order!
Already solved ones are at the bottom of the table.


Id Title Translations Solved
1Sum "A+B"DE ES FR AR ZH RO RU SK55531
2Sum in LoopDE ES FR AR ZH RO RU SK33946
3Sums in LoopDE ES FR AR ZH RO RU SK25897
4Minimum of TwoDE ES FR AR ZH RO RU SK22552
5Minimum of ThreeDE ES FR AR ZH RO RU SK20207
15Maximum of arrayDE ES AR ZH RO RU SK17658
6RoundingDE ES AR ZH RO RU SK16277
7Fahrenheit to CelsiusDE ES AR ZH RO RU SK15577
20Vowel CountDE ES AR ZH RO RU SK12639
11Sum of digitsDE ES RU ZH SK12538
8Arithmetic ProgressionDE ES RU ZH SK11735
41Median of ThreeDE ES AR ZH RO RU SK10774
9TrianglesDE ES RU ZH SK11145
28Body Mass IndexDE ES ZH RU SK10643
13Weighted sum of digitsDE ES RU ZH SK10141
43Dice RollingDE ES ZH RU SK9140
16Average of an arrayDE ES RU SK9592
30Reverse StringDE ES RU SK9030
17Array ChecksumDE ES RU SK8890
21Array CountersDE ES RU SK8285
10Linear FunctionDE ES RU SK8008
48Collatz SequenceDE ES RU SK7227
12Modulo and time differenceDE ES RU SK7355
14Modular CalculatorES SK6795
27Bubble SortES RU SK6132
26Greatest Common DivisorES SK RU5983
18Square RootES RU5763
29Sort with IndexesRU5539
50PalindromesDE ES RU SK5081
23Bubble in ArrayES RU5314
52Pythagorean TheoremRU4873
31Rotate StringES RU5074
67Fibonacci SequenceRU4392
68Bicycle RaceES RU4361
57Smoothing the WeatherES RU4394
24Neumann's Random GeneratorDE ES RU4750
35Savings Calculator4167
104Triangle AreaES3458
25Linear Congruential GeneratorRU4115
44Double Dice RollRU3907
32Josephus ProblemRU4009
81Bit CountRU3502
19Matching BracketsES RU3751
128Combinations Counting2745
58Card Names3331
47Caesar Shift CipherSK3414
49Rock Paper Scissors3363
55Matching Words3260
94Fool's Day 2014SK2839
59Bulls and Cows2944
61Prime Numbers GenerationRU2902
22Two PrintersES RU3124
42Blackjack Counting2677
120Selection Sort2098
38Quadratic Equation2466
33Parity ControlRU2426
53King and Queen2163
171Tree Height Measurement1500
34Binary Search2231
37Mortgage CalculatorZH2094
45Cards ShufflingZH2041
69Fibonacci Divisibility1909
63Integer FactorizationZH1827
46Tic-Tac-ToeZH1884
72Funny Words Generator1635
62Prime Ranges1669
121Insertion Sort1390
75Yacht or Dice Poker1549
172Cloud Altitude Measurement1129
127Anagrams1301
447Fixed Product, Minimum Sum7
134Flying Text Screensaver1204
39Share Price Volatility1559
156Luhn AlgorithmSK1030
114Tricky Printing1142
444White Rectangle16
80Duel Chances1166
448Button Cycles2
135Variable Length Code926
36Code GuesserUA1214
74Clock Hands1100
105Convex Polygon Area952
54Pythagorean Triples1072
446Hangman7
145Modular Exponentiation797
73Hexagonal Grid972
428Broken Keyboard53
116Summing Up830
97Girls and Pigs870
181Reverse Polish Notation612
187Static Web Page596
188Basics of HTML570
98Azimuth at Treasure Island756
122QuickSort704
85Rotation in 2D Space763
51Dungeons and Dragons DiceUA822
56Life is Simple798
40Paths in the GridUA812
70Most Frequent Word727
66Caesar Cipher Cracker727
88Pitch and Notes673
108Star Medals609
87Tree Builder615
95Simple Linear Regression601
429Moving Average in Time33
60Sweet Harvest652
77Point to Segment Distance610
211Information Entropy386
86Brainfuck Interpreter572
207Suffix Array378
445Formula 15
91Game of 2048535
176Say 100407
71Fibonacci Divisibility Advanced561
143Extended Euclidean Algorithm442
101Gradient Calculation496
437Elections and Happiness16
195Mul Two356
119Brain Fibo461
191Spaceship Weight Fraud356
82Levenshtein Distance505
425Explosive Breeding32
206Base-32 Encoding321
89Instrument Tuner472
433A Crime on Logic Island20
64Maze Pathfinder492
131Four Pics One Word395
79Cycles Detection451
92Binary Heap424
385Number of steps in Euclidean Algorithm75
189Dynamic Web Page302
136Variable Length Code Unpack351
83Graph Generator410
150Introducing Regexps334
126Sequence of Squares359
377Sum of Digits Divisibility79
90Lexicographic Permutations385
170Binary Search in Array297
301Skyscraper Price156
167Copy Line298
78Bezier Curves391
197Loops in Assembly263
154Breadth First Search304
440Mud Walker8
117Divide by Two327
65Transitive Closure on Candy States377
99Uphill Shooting342
144Modular Inverse279
155Depth First Search266
161Topological Sorting255
174Calculation of Pi243
133Billiard Ball270
442Chomp5
165Safe Landing239
140Proper Bracket Sequences256
76Pawn Move Validator305
438Maze Generator8
96Snake Arcade283
434A Crime on Logic Island Advanced11
190Query String Parameters204
435Maze Mapping API-Robot10
184Matches Picking206
123Knapsack of Integers251
366Image Cutting63
436Avoid the Grid Points9
103Easter Eggs265
93Starving Priority Queue271
84Dijkstra in the Network274
130Combinations with Repetitions235
125Bogosort235
173Chords of Music198
323Next Palindrome88
399Methane Identification34
109Lucky Tickets230
146Color Cubes203
371Pages to Print51
360Whisky Blending58
151Word Ladders196
427Cheapest Bus Tickets13
208Neighborhood of a String152
129Enumerating Combinations201
164Page Rank177
138Huffman Coding189
139Beam Balance and Masses188
194Convex Hull and Farmers150
201Point in Polygon144
199Employees Web App141
337Introducing Zeckendorf62
137Shannon-Fano Coding174
152RSA Cryptography165
411Elo Ratings20
192Gangster Battles140
418Expected Number of Random Moves16
368Number Base Palindrome43
414MIDI Variable Length Numbers18
329Roman Arithmetic64
111Necklace Count180
374Longest Common Subsequence39
244Introducing SQL106
110Lucky Tickets Advanced170
439Power Sum of Digits4
443Football League Tables2
168Caesar meets BF137
253Beautiful Line Chart94
432Ball Bearing Collisions7
245Aggregations in SQL95
269Fibonacci coding83
148Public Key Cryptography Intro139
423Russian Dolls11
124Knapsack Backtracking148
162Rubik's Cube130
202Dancing Pairs111
106Random Search Optimization154
179Look and Say binary121
198Prn Hex Str110
372String Minimization33
214Sick Travellers102
364Arthur Engel's Randomizer36
182Frodo and Black Riders115
359Find 3 Numbers38
177Nim Game113
401Methane Rotation19
160Social Web Scraper119
102Travelling Salesman143
294Vigenere Cipher63
185Simple 3D Scene108
246Joins in SQL80
158Hamming Codes115
157Emirp primE115
421Princess and Tiger10
431King and Rook Checkmate6
400Memory Check18
420Life on a String10
384Equal Hamming Distance23
159Hard Life106
258Text Justification68
407River Labyrinth14
265Update in SQL63
426Weighted Sum of Digits 27
196Fibonacci Randomizer86
153Fermat goes hacking RSA100
381Finding Squares22
100Crossing the Road117
277The Adventure of Morse Code57
291Squirrels vs. Acorns52
115Gradient Descent for SLE111
281Basic Tokenizer55
141Sliding Window Search100
186Simple 3D Scene (cont)84
193Maximum Flow78
166Page Rank as Eigenvector86
142LZ77 decompression92
209Suffix Array Advanced71
412Json Fix10
210Ticket Puzzle70
203Tic-Tac-Toe Minimax Algorithm70
219Neural Network Calculation65
113Ground Zero95
112Travelling Salesman Inverted94
406Wormholes of Cygnus11
351Nicomachus26
216Cracking Linear Congruential Generator63
390Card Pairing Solitaire15
274Two Buckets46
132Stream Cipher Breaking82
163Colliding Balls72
335Venus Visible28
405Three Friendly Knights10
409Election Fever9
441Max versus Min1
175Algae Robot67
107Knight's Tour82
259Easter Bunnies45
205Clustering the Stars58
403Hi-Lo dice game10
241Village Ways48
389Binary Split Guessing Game13
200Fizz Buzz in Asm57
230Move-To-Front Transform50
293Sums of Triplets35
204Wandering Star55
334Find all of the SETs25
315Count the Common Factors29
408Mad Beaver in River Labyrinth8
292Factorial Trailing Zeroes33
218Rain Must FallDE49
212BCD to Hex50
430Cutting Paper3
257Missing Records in SQL39
149Prime Chains61
376Cartesian Tree Visualization14
379Dice with Infinity Sides13
233Language Study42
307The Problem of Too Many Clues27
388Fibonacci Guessing Game11
393Urban Planning10
413Tree Painting6
147Color Cubes Advanced57
178Maze of the Wumpus51
417Unfortunate Bubble Sort5
118Maxit Single-Player61
330Easter Bunnies Are Back21
180Simple Game of Sticks48
416Socket Server5
223Introducing Scheme40
398Collecting Diamonds8
415Smallest Message5
347Unwanted Multiples17
324Merge Sort21
392Fixing an Anagram9
352Hurkle16
386Advent Calendar Chocolate10
338Throwing Easter Eggs18
402Game of Stones7
255LCM of a range32
354Too Many Divisors15
229Burrows-Wheeler Transform36
419Special Digits4
395Growth of Micro-Organisms8
299Tree Visualizer24
297Collatz in the Range24
382Die Throw Sequences10
247Towers of Hanoi32
363Language Detector13
375Space Invaders11
183Connect Four42
367Roguelike 1d12
296Tree ValueRU23
353Hurkle Hunter14
339Parking Lot16
349Burrows14
287Palindrome Frog23
340Zeckendorf Lite15
346Long Decimal Fractions14
284Rotate Array In-Place23
270Hexlife25
290Every Leaf on Every Tree22
331Rotating Toy Display16
358Mandelbrot Set12
357Ulam's Prime Spiral12
298Revoltle20
312The Shredder Conundrum18
217Personality Swap31
362Euclid, Manhattan and Chebyshev11
238Bear Hunt28
383E2C2S - try harder!8
249Turing Increment26
256Rook Jump Maze25
404Methane Normalization5
261Easter Bunnies 2D24
282Predictable Board Game21
243Grille Encryption26
234Train Merge27
387Big Numbers7
286Self-Printing Program20
169Automated Landing35
300Run-Length Encoding18
313Seven Segment Decoder16
361Rogue Mazes10
271A Knight some Trolls and a Princess21
285Rotate Matrix In Place19
268Logic Transformation21
424New Towers of Hanoi2
275Three Buckets19
344Throwing Easter Eggs Part 211
422Mabinogion Sheep2
250Turing Clone21
394Many Shortest Routes5
213Micro-LifeSK24
326Sum Them Forth12
314The Sorites Solution13
332Easter Bunnies 2D Are Back11
410Village Door Shuffle3
341Zeckendorf Advanced10
380Treap Study6
220Neural Network Training22
319Tower of Hanoi Rules12
378Space Invaders Automation6
336Currency Arbitrage10
365Flower Border Arrangements7
289The Case of the Desperate Mastermind14
231Dice Black Jack19
262Easter Bunnies 2D Advanced16
306Line Drawing Algorithm12
316Apogee11
260Low Cost Road Network16
303Towers Under Cover12
222Easter Eggs Advanced19
221XWords19
254Rule 30 by Turing16
288Langton's Ant13
276Lucky Pairs14
263Easter Bunnies 3D15
343Village of Ticks8
266Pancake Sorting14
350Colourful Egg Sequences7
311The Mirror Maze10
309Board Game Sequences10
295Vigenere Cipher Cracker11
333Happy Triplets8
320Accordion9
345Elliptic Curves Basics7
397Trading Bot3
279Two Buckets Advanced12
396Chocolate Triangles and BF3
235Train Merge Advanced15
327Dobbin's Long Journey8
325Ultimate Sort Trial8
242Comment Stripper14
305The Catacombs of Chronos9
391Scout Proficiency Badges3
328Beep Beep Beep7
237Road Network Destruction13
267Turing Maze11
310Board Game Sequences Advanced8
308Circle Drawing Algorithm8
227Hashtable Implementation13
322Gray Decoder7
369Flappy Bird4
304Ordered Brackets8
215KlotskiSK13
264Party Presents10
225Hamurabi12
342Adaptive Arithmetic Coding5
252Shadok and Gibis10
283Predictable Board Game on 10 Boards8
226Multiplicative Persistence Backtrace11
224Transposing List of Lists11
355Robots Game4
373Railroad Rat3
370Jewels3
248Christmas Puzzle9
302Sound-Controlled Robot6
280Three Buckets Re-visited7
321Hanoi Tower Heights5
278Polyomino Generation7
251Radio Spies8
356Robots Game Autoplay3
239Foxes and Geese8
236Is the Earth Flat8
232Shift Register Randomizer8
273Logic Glitches6
348Trick-Taking Game3
272Hexplore6
240Playfair Cipher Cracking7
317Launch to Orbit4
228Maze Mapping Robot6
318Launch to Orbit automated2