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 SK53596
2Sum in LoopDE ES FR AR ZH RO RU SK32932
3Sums in LoopDE ES FR AR ZH RO RU SK25102
4Minimum of TwoDE ES FR AR ZH RO RU SK21851
5Minimum of ThreeDE ES FR AR ZH RO RU SK19577
15Maximum of arrayDE ES AR ZH RO RU SK17121
6RoundingDE ES AR ZH RO RU SK15840
7Fahrenheit to CelsiusDE ES AR ZH RO RU SK15112
20Vowel CountDE ES AR ZH RO RU SK12274
11Sum of digitsDE ES RU ZH SK12131
41Median of ThreeDE ES AR ZH RO RU SK10500
8Arithmetic ProgressionDE ES RU ZH SK11345
28Body Mass IndexDE ES ZH RU SK10335
9TrianglesDE ES RU ZH SK10776
13Weighted sum of digitsDE ES RU ZH SK9836
43Dice RollingDE ES ZH RU SK8909
16Average of an arrayDE ES RU SK9328
30Reverse StringDE RU SK8774
17Array ChecksumDE ES RU SK8635
21Array CountersDE ES RU SK8070
48Collatz SequenceDE ES RU SK7014
10Linear FunctionDE ES RU SK7732
12Modulo and time differenceDE ES RU SK7121
14Modular CalculatorES SK6582
27Bubble SortES RU SK5962
26Greatest Common DivisorRU SK5813
18Square RootES RU5568
29Sort with IndexesRU5380
50PalindromesDE ES RU SK4917
23Bubble in ArrayES RU5159
52Pythagorean TheoremRU4713
31Rotate StringES RU4921
67Fibonacci SequenceRU4270
68Bicycle RaceES RU4247
57Smoothing the WeatherES RU4278
24Neumann's Random GeneratorDE ES RU4596
104Triangle Area3353
35Savings Calculator4028
81Bit CountRU3403
25Linear Congruential GeneratorRU3988
44Double Dice RollRU3779
32Josephus ProblemRU3879
128Combinations Counting2659
19Matching BracketsES RU3620
58Card Names3227
47Caesar Shift CipherSK3318
49Rock Paper Scissors3260
55Matching Words3169
94Fool's Day 2014SK2761
59Bulls and Cows2852
61Prime Numbers GenerationRU2809
22Two PrintersES RU3004
120Selection Sort2024
42Blackjack Counting2582
400Memory Check13
38Quadratic Equation2377
33Parity ControlRU2331
171Tree Height Measurement1442
53King and Queen2085
34Binary Search2147
69Fibonacci Divisibility1847
37Mortgage CalculatorZH2010
45Cards ShufflingZH1958
63Integer FactorizationZH1771
46Tic-Tac-ToeZH1813
72Funny Words Generator1581
62Prime Ranges1617
121Insertion Sort1332
172Cloud Altitude Measurement1080
127Anagrams1264
75Yacht or Dice Poker1495
134Flying Text Screensaver1168
39Share Price Volatility1497
156Luhn AlgorithmSK989
399Methane Identification11
114Tricky Printing1116
80Duel Chances1130
385Number of steps in Euclidean Algorithm58
135Variable Length Code883
74Clock Hands1062
36Code GuesserUA1157
105Convex Polygon Area910
54Pythagorean Triples1030
145Modular Exponentiation760
73Hexagonal Grid938
116Summing Up809
97Girls and Pigs841
187Static Web Page582
181Reverse Polish Notation580
188Basics of HTML557
377Sum of Digits Divisibility63
122QuickSort677
98Azimuth at Treasure Island725
85Rotation in 2D Space731
51Dungeons and Dragons DiceUA790
56Life is Simple766
70Most Frequent Word702
40Paths in the GridUA758
66Caesar Cipher Cracker702
88Pitch and Notes642
108Star Medals591
211Information Entropy362
95Simple Linear Regression576
87Tree Builder590
207Suffix Array361
60Sweet Harvest617
77Point to Segment Distance582
176Say 100395
86Brainfuck Interpreter549
195Mul Two346
143Extended Euclidean Algorithm433
71Fibonacci Divisibility Advanced543
91Game of 2048508
191Spaceship Weight Fraud340
119Brain Fibo453
101Gradient Calculation474
206Base-32 Encoding308
82Levenshtein Distance485
398Collecting Diamonds5
89Instrument Tuner454
131Four Pics One Word384
189Dynamic Web Page300
64Maze Pathfinder471
366Image Cutting48
79Cycles Detection434
92Binary Heap411
150Introducing Regexps328
126Sequence of Squares354
136Variable Length Code Unpack339
170Binary Search in Array289
197Loops in Assembly255
167Copy Line291
83Graph Generator390
384Equal Hamming Distance21
301Skyscraper Price122
374Longest Common Subsequence33
90Lexicographic Permutations374
154Breadth First Search293
78Bezier Curves375
371Pages to Print34
117Divide by Two319
393Urban Planning9
99Uphill Shooting332
390Card Pairing Solitaire12
65Transitive Closure on Candy States360
144Modular Inverse271
155Depth First Search257
174Calculation of Pi234
161Topological Sorting241
389Binary Split Guessing Game12
165Safe Landing228
133Billiard Ball258
190Query String Parameters201
368Number Base Palindrome31
323Next Palindrome72
140Proper Bracket Sequences240
184Matches Picking198
360Whisky Blending37
381Finding Squares18
76Pawn Move Validator290
96Snake Arcade271
372String Minimization25
103Easter Eggs256
395Growth of Micro-Organisms5
388Fibonacci Guessing Game11
123Knapsack of Integers238
130Combinations with Repetitions228
93Starving Priority Queue258
173Chords of Music190
125Bogosort230
337Introducing Zeckendorf53
84Dijkstra in the Network263
392Fixing an Anagram7
109Lucky Tickets226
146Color Cubes197
364Arthur Engel's Randomizer28
151Word Ladders189
208Neighborhood of a String143
329Roman Arithmetic53
164Page Rank171
129Enumerating Combinations196
138Huffman Coding185
194Convex Hull and Farmers145
359Find 3 Numbers29
139Beam Balance and Masses182
386Advent Calendar Chocolate10
201Point in Polygon137
199Employees Web App138
152RSA Cryptography161
192Gangster Battles135
137Shannon-Fano Coding168
394Many Shortest Routes4
111Necklace Count176
397Trading Bot2
244Introducing SQL90
110Lucky Tickets Advanced166
168Caesar meets BF132
269Fibonacci coding71
202Dancing Pairs107
198Prn Hex Str109
179Look and Say binary119
245Aggregations in SQL82
148Public Key Cryptography Intro133
214Sick Travellers98
162Rubik's Cube125
379Dice with Infinity Sides11
124Knapsack Backtracking141
182Frodo and Black Riders110
106Random Search Optimization148
396Chocolate Triangles and BF2
177Nim Game111
253Beautiful Line Chart73
294Vigenere Cipher52
185Simple 3D Scene104
160Social Web Scraper115
383E2C2S - try harder!8
102Travelling Salesman139
157Emirp primE113
376Cartesian Tree Visualization11
158Hamming Codes111
258Text Justification63
246Joins in SQL67
281Basic Tokenizer51
159Hard Life103
277The Adventure of Morse Code52
196Fibonacci Randomizer85
291Squirrels vs. Acorns45
351Nicomachus20
375Space Invaders10
335Venus Visible26
153Fermat goes hacking RSA99
382Die Throw Sequences7
265Update in SQL52
100Crossing the Road114
115Gradient Descent for SLE107
141Sliding Window Search97
186Simple 3D Scene (cont)80
210Ticket Puzzle69
391Scout Proficiency Badges3
209Suffix Array Advanced69
363Language Detector13
166Page Rank as Eigenvector82
193Maximum Flow72
142LZ77 decompression89
203Tic-Tac-Toe Minimax Algorithm67
352Hurkle16
219Neural Network Calculation61
387Big Numbers4
334Find all of the SETs21
315Count the Common Factors27
112Travelling Salesman Inverted92
274Two Buckets40
216Cracking Linear Congruential Generator58
354Too Many Divisors14
113Ground Zero89
353Hurkle Hunter14
132Stream Cipher Breaking80
175Algae Robot66
163Colliding Balls69
378Space Invaders Automation6
347Unwanted Multiples15
205Clustering the Stars56
200Fizz Buzz in Asm57
367Roguelike 1d9
259Easter Bunnies39
230Move-To-Front Transform47
107Knight's Tour81
358Mandelbrot Set11
380Treap Study5
292Factorial Trailing Zeroes29
204Wandering Star53
241Village Ways42
293Sums of Triplets28
330Easter Bunnies Are Back18
212BCD to Hex49
307The Problem of Too Many Clues23
338Throwing Easter Eggs15
362Euclid, Manhattan and Chebyshev9
346Long Decimal Fractions13
218Rain Must FallDE45
349Burrows12
357Ulam's Prime Spiral10
361Rogue Mazes9
257Missing Records in SQL34
149Prime Chains60
233Language Study39
324Merge Sort17
147Color Cubes Advanced55
178Maze of the Wumpus48
223Introducing Scheme37
180Simple Game of Sticks46
118Maxit Single-Player59
297Collatz in the Range21
339Parking Lot12
299Tree Visualizer20
287Palindrome Frog22
296Tree ValueRU20
255LCM of a range28
229Burrows-Wheeler Transform33
340Zeckendorf Lite11
313Seven Segment Decoder16
344Throwing Easter Eggs Part 210
183Connect Four40
298Revoltle18
247Towers of Hanoi27
341Zeckendorf Advanced10
312The Shredder Conundrum15
270Hexlife22
290Every Leaf on Every Tree18
284Rotate Array In-Place19
331Rotating Toy Display11
282Predictable Board Game19
286Self-Printing Program18
249Turing Increment24
217Personality Swap29
326Sum Them Forth11
332Easter Bunnies 2D Are Back10
261Easter Bunnies 2D21
350Colourful Egg Sequences7
238Bear Hunt24
369Flappy Bird4
275Three Buckets18
268Logic Transformation19
234Train Merge24
314The Sorites Solution12
300Run-Length Encoding14
169Automated Landing33
285Rotate Matrix In Place16
345Elliptic Curves Basics7
243Grille Encryption21
271A Knight some Trolls and a Princess17
256Rook Jump Maze19
336Currency Arbitrage8
343Village of Ticks7
306Line Drawing Algorithm12
365Flower Border Arrangements4
213Micro-LifeSK24
250Turing Clone19
333Happy Triplets8
370Jewels3
220Neural Network Training21
311The Mirror Maze10
309Board Game Sequences10
289The Case of the Desperate Mastermind12
288Langton's Ant12
276Lucky Pairs13
303Towers Under Cover10
266Pancake Sorting14
320Accordion8
319Tower of Hanoi Rules8
328Beep Beep Beep7
355Robots Game4
279Two Buckets Advanced12
260Low Cost Road Network14
231Dice Black Jack17
325Ultimate Sort Trial7
373Railroad Rat2
305The Catacombs of Chronos9
254Rule 30 by Turing14
263Easter Bunnies 3D13
322Gray Decoder7
262Easter Bunnies 2D Advanced13
342Adaptive Arithmetic Coding5
221XWords17
310Board Game Sequences Advanced8
308Circle Drawing Algorithm8
222Easter Eggs Advanced16
295Vigenere Cipher Cracker9
316Apogee7
304Ordered Brackets8
242Comment Stripper13
356Robots Game Autoplay3
235Train Merge Advanced13
327Dobbin's Long Journey5
215KlotskiSK13
267Turing Maze9
237Road Network Destruction11
302Sound-Controlled Robot6
227Hashtable Implementation11
226Multiplicative Persistence Backtrace11
225Hamurabi11
283Predictable Board Game on 10 Boards7
264Party Presents8
248Christmas Puzzle9
278Polyomino Generation7
224Transposing List of Lists10
317Launch to Orbit4
348Trick-Taking Game2
273Logic Glitches6
236Is the Earth Flat8
252Shadok and Gibis7
251Radio Spies7
321Hanoi Tower Heights3
232Shift Register Randomizer7
272Hexplore5
240Playfair Cipher Cracking6
280Three Buckets Re-visited4
239Foxes and Geese5
318Launch to Orbit automated2
228Maze Mapping Robot5