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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.

Volume:

Simple Implementation Algorithms Puzzles Special

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Id	Title	Translations	Author	Solved	Blessing
1	Sum "A+B"	DE ES FR AR ZH RO RU SK		56976	1.00
2	Sum in Loop	DE ES FR AR ZH RO RU SK		34621	1.87
3	Sums in Loop	DE ES FR AR ZH RO RU SK		26358	2.34
4	Minimum of Two	DE ES FR AR ZH RO RU SK		22951	2.58
5	Minimum of Three	DE ES FR AR ZH RO RU SK		20555	2.77
15	Maximum of array	DE ES AR ZH RO RU SK		17949	3.01
6	Rounding	DE ES AR ZH RO RU SK		16476	3.16
7	Fahrenheit to Celsius	DE ES AR ZH RO RU SK		15776	3.23
20	Vowel Count	DE ES AR ZH RO RU SK		12796	3.59
11	Sum of digits	DE ES RU ZH SK		12703	3.61
8	Arithmetic Progression	DE ES RU ZH SK		11892	3.72
41	Median of Three	DE ES AR ZH RO RU SK		10902	3.87
9	Triangles	DE ES RU ZH SK		11288	3.81
28	Body Mass Index	DE ES ZH RU SK		10777	3.89
13	Weighted sum of digits	DE ES RU ZH SK		10266	3.98
43	Dice Rolling	DE ES ZH RU SK		9240	4.16
16	Average of an array	DE ES RU SK		9718	4.07
30	Reverse String	DE ES RU SK		9148	4.18
17	Array Checksum	DE ES RU SK		9000	4.21
21	Array Counters	DE ES RU SK		8376	4.33
10	Linear Function	DE ES RU SK		8095	4.39
48	Collatz Sequence	DE ES RU SK		7314	4.57
12	Modulo and time difference	DE ES RU SK		7427	4.54
14	Modular Calculator	ES SK		6872	4.67
27	Bubble Sort	ES RU SK		6209	4.85
26	Greatest Common Divisor	ES SK RU		6042	4.90
18	Square Root	ES RU		5847	4.95
29	Sort with Indexes	RU		5599	5.03
50	Palindromes	DE ES RU SK		5149	5.18
23	Bubble in Array	ES RU		5373	5.10
52	Pythagorean Theorem	RU		4936	5.25
31	Rotate String	ES RU		5127	5.18
67	Fibonacci Sequence	RU		4441	5.43
68	Bicycle Race	ES RU		4412	5.44
57	Smoothing the Weather	ES RU		4440	5.43
24	Neumann's Random Generator	DE ES RU		4793	5.30
35	Savings Calculator			4211	5.52
104	Triangle Area	ES		3512	5.84
25	Linear Congruential Generator	RU		4157	5.55
44	Double Dice Roll	RU		3946	5.64
32	Josephus Problem	RU		4048	5.59
81	Bit Count	RU		3537	5.83
19	Matching Brackets	ES RU		3804	5.70
58	Card Names			3372	5.91
128	Combinations Counting			2779	6.25
47	Caesar Shift Cipher	SK		3450	5.87
49	Rock Paper Scissors			3404	5.89
55	Matching Words			3299	5.95
94	Fool's Day 2014	SK		2883	6.18
59	Bulls and Cows			2983	6.12
61	Prime Numbers Generation	RU		2934	6.15
22	Two Printers	ES RU		3167	6.02
42	Blackjack Counting			2714	6.29
120	Selection Sort			2131	6.71
38	Quadratic Equation			2500	6.43
33	Parity Control	RU		2456	6.46
53	King and Queen			2193	6.66
34	Binary Search			2262	6.60
171	Tree Height Measurement			1524	7.29
37	Mortgage Calculator	ZH		2127	6.71
45	Cards Shuffling	ZH		2073	6.76
69	Fibonacci Divisibility			1939	6.87
63	Integer Factorization	ZH		1854	6.95
46	Tic-Tac-Toe	ZH		1916	6.89
72	Funny Words Generator			1654	7.15
62	Prime Ranges			1694	7.11
121	Insertion Sort			1413	7.42
75	Yacht or Dice Poker			1572	7.24
461	Lucky 7		csfpython	7	16.41
172	Cloud Altitude Measurement			1154	7.77
127	Anagrams			1312	7.55
39	Share Price Volatility			1579	7.23
134	Flying Text Screensaver			1215	7.68
156	Luhn Algorithm	SK		1049	7.94
114	Tricky Printing			1158	7.77
80	Duel Chances			1185	7.73
36	Code Guesser	UA		1234	7.66
135	Variable Length Code			939	8.13
74	Clock Hands			1110	7.84
105	Convex Polygon Area			968	8.08
54	Pythagorean Triples			1085	7.88
145	Modular Exponentiation			815	8.38
73	Hexagonal Grid			989	8.04
116	Summing Up			842	8.32
97	Girls and Pigs			884	8.24
181	Reverse Polish Notation			625	8.84
187	Static Web Page			602	8.90
98	Azimuth at Treasure Island			768	8.48
188	Basics of HTML			575	8.98
122	QuickSort			712	8.61
85	Rotation in 2D Space			777	8.46
51	Dungeons and Dragons Dice	UA		829	8.35
460	Carlsdale Caverns		csfpython	5	16.91
56	Life is Simple			803	8.40
40	Paths in the Grid	UA		825	8.35
428	Broken Keyboard			66	12.72
70	Most Frequent Word			730	8.57
66	Caesar Cipher Cracker			733	8.56
88	Pitch and Notes			678	8.70
108	Star Medals			613	8.87
95	Simple Linear Regression			608	8.88
87	Tree Builder			620	8.85
60	Sweet Harvest			657	8.75
77	Point to Segment Distance			615	8.86
211	Information Entropy			387	9.67
86	Brainfuck Interpreter			577	8.98
459	Number String Multiples of Thirteen		csfpython	5	16.91
207	Suffix Array			379	9.70
91	Game of 2048			541	9.09
71	Fibonacci Divisibility Advanced			569	9.00
176	Say 100			411	9.56
143	Extended Euclidean Algorithm			449	9.41
458	Mountain Panorama		csfpython	6	16.64
101	Gradient Calculation			501	9.22
119	Brain Fibo			465	9.35
82	Levenshtein Distance			511	9.19
195	Mul Two			358	9.80
191	Spaceship Weight Fraud			359	9.80
89	Instrument Tuner			475	9.31
206	Base-32 Encoding			326	9.96
64	Maze Pathfinder			496	9.24
131	Four Pics One Word			397	9.62
79	Cycles Detection			459	9.37
429	Moving Average in Time			39	13.61
92	Binary Heap			432	9.48
189	Dynamic Web Page			303	10.09
83	Graph Generator			414	9.55
136	Variable Length Code Unpack			356	9.81
150	Introducing Regexps			336	9.91
126	Sequence of Squares			361	9.79
385	Number of steps in Euclidean Algorithm		gardengnome	82	12.35
90	Lexicographic Permutations			388	9.66
170	Binary Search in Array			300	10.11
301	Skyscraper Price			165	11.14
167	Copy Line			302	10.10
78	Bezier Curves			393	9.64
154	Breadth First Search			309	10.06
444	White Rectangle			18	14.91
457	Railroad and Hamilton			5	16.91
462	Rota Boards		csfpython	-	20.02
197	Loops in Assembly			265	10.32
377	Sum of Digits Divisibility			83	12.33
65	Transitive Closure on Candy States			382	9.69
117	Divide by Two			329	9.95
99	Uphill Shooting			344	9.87
425	Explosive Breeding			35	13.80
144	Modular Inverse			282	10.22
155	Depth First Search			269	10.30
161	Topological Sorting			262	10.34
174	Calculation of Pi			248	10.44
133	Billiard Ball			272	10.28
165	Safe Landing			244	10.47
452	Implication in Logic			8	16.21
140	Proper Bracket Sequences			260	10.36
437	Elections and Happiness			20	14.73
76	Pawn Move Validator			311	10.05
96	Snake Arcade			285	10.20
190	Query String Parameters			205	10.77
184	Matches Picking		quandray	209	10.73
103	Easter Eggs			268	10.30
123	Knapsack of Integers			253	10.40
93	Starving Priority Queue			274	10.27
84	Dijkstra in the Network			277	10.25
433	A Crime on Logic Island		csfpython	21	14.65
130	Combinations with Repetitions			240	10.49
125	Bogosort			239	10.50
453	SR latch			6	16.64
173	Chords of Music			202	10.79
447	Fixed Product, Minimum Sum		csfpython	10	15.86
366	Image Cutting		oezguery	65	12.74
454	Multiplexer 4x4			5	16.91
109	Lucky Tickets			233	10.55
323	Next Palindrome		csfpython	91	12.17
146	Color Cubes			207	10.75
449	Space Pirates		csfpython	8	16.21
151	Word Ladders			199	10.82
455	D flip-flop			4	17.23
371	Pages to Print			56	13.00
129	Enumerating Combinations			205	10.77
164	Page Rank			181	10.98
208	Neighborhood of a String			153	11.27
138	Huffman Coding			193	10.87
139	Beam Balance and Masses			192	10.88
399	Methane Identification		moxieman	37	13.70
360	Whisky Blending		csfpython	60	12.88
194	Convex Hull and Farmers			156	11.24
201	Point in Polygon			148	11.33
152	RSA Cryptography			170	11.09
137	Shannon-Fano Coding			178	11.01
199	Employees Web App			141	11.41
337	Introducing Zeckendorf		csfpython	66	12.72
446	Hangman			8	16.21
192	Gangster Battles			142	11.40
111	Necklace Count			182	10.97
329	Roman Arithmetic		csfpython	67	12.69
244	Introducing SQL			110	11.84
110	Lucky Tickets Advanced			174	11.05
253	Beautiful Line Chart			101	11.99
168	Caesar meets BF			137	11.46
368	Number Base Palindrome		csfpython	43	13.45
374	Longest Common Subsequence			40	13.57
269	Fibonacci coding			88	12.23
245	Aggregations in SQL			99	12.02
148	Public Key Cryptography Intro			141	11.41
124	Knapsack Backtracking			150	11.31
162	Rubik's Cube			133	11.51
411	Elo Ratings		moxieman	22	14.58
179	Look and Say binary			124	11.64
106	Random Search Optimization			156	11.24
202	Dancing Pairs			112	11.81
435	Maze Mapping API-Robot			11	15.71
456	Every Third Bit			2	18.11
214	Sick Travellers			105	11.92
198	Prn Hex Str			111	11.83
294	Vigenere Cipher			70	12.62
182	Frodo and Black Riders			117	11.74
451	Maximize Toy Production		csfpython	4	17.23
427	Cheapest Bus Tickets			14	15.32
434	A Crime on Logic Island Advanced		csfpython	11	15.71
102	Travelling Salesman			146	11.35
372	String Minimization			36	13.75
160	Social Web Scraper			122	11.66
177	Nim Game			115	11.76
418	Expected Number of Random Moves		moxieman	17	15.00
438	Maze Generator			9	16.02
364	Arthur Engel's Randomizer			38	13.66
158	Hamming Codes			119	11.71
185	Simple 3D Scene			108	11.87
440	Mud Walker			8	16.21
414	MIDI Variable Length Numbers			18	14.91
246	Joins in SQL			83	12.33
359	Find 3 Numbers		csfpython	39	13.61
157	Emirp primE			116	11.75
401	Methane Rotation		moxieman	22	14.58
436	Avoid the Grid Points		csfpython	9	16.02
159	Hard Life			107	11.89
258	Text Justification			71	12.59
153	Fermat goes hacking RSA			105	11.92
265	Update in SQL			65	12.74
442	Chomp			6	16.64
445	Formula 1			5	16.91
400	Memory Check			20	14.73
196	Fibonacci Randomizer			87	12.24
100	Crossing the Road			118	11.72
115	Gradient Descent for SLE			112	11.81
277	The Adventure of Morse Code		zelevin	58	12.94
141	Sliding Window Search			101	11.99
281	Basic Tokenizer			56	13.00
291	Squirrels vs. Acorns		zelevin	52	13.13
450	Bead Games		csfpython	3	17.61
186	Simple 3D Scene (cont)			84	12.31
384	Equal Hamming Distance		csfpython	23	14.50
166	Page Rank as Eigenvector			89	12.21
193	Maximum Flow			80	12.39
423	Russian Dolls		csfpython	11	15.71
142	LZ77 decompression			95	12.09
381	Finding Squares		csfpython	23	14.50
209	Suffix Array Advanced			72	12.57
407	River Labyrinth			15	15.21
210	Ticket Puzzle			71	12.59
112	Travelling Salesman Inverted			97	12.06
113	Ground Zero			96	12.08
203	Tic-Tac-Toe Minimax Algorithm			71	12.59
219	Neural Network Calculation			66	12.72
216	Cracking Linear Congruential Generator			64	12.77
421	Princess and Tiger			10	15.86
432	Ball Bearing Collisions		csfpython	7	16.41
132	Stream Cipher Breaking			84	12.31
420	Life on a String		csfpython	10	15.86
351	Nicomachus			27	14.23
274	Two Buckets			46	13.33
163	Colliding Balls			73	12.55
107	Knight's Tour			85	12.28
175	Algae Robot			68	12.67
230	Move-To-Front Transform			54	13.06
412	Json Fix			11	15.71
390	Card Pairing Solitaire			16	15.10
205	Clustering the Stars			58	12.94
406	Wormholes of Cygnus		moxieman	12	15.57
335	Venus Visible			28	14.17
259	Easter Bunnies		gardengnome	45	13.37
241	Village Ways			49	13.23
200	Fizz Buzz in Asm			58	12.94
431	King and Rook Checkmate			6	16.64
293	Sums of Triplets			36	13.75
334	Find all of the SETs		csfpython	27	14.23
403	Hi-Lo dice game			12	15.57
204	Wandering Star			55	13.03
426	Weighted Sum of Digits 2		csfpython	7	16.41
439	Power Sum of Digits		csfpython	4	17.23
218	Rain Must Fall	DE		50	13.19
212	BCD to Hex			51	13.16
315	Count the Common Factors		csfpython	29	14.11
379	Dice with Infinity Sides		telebashna	16	15.10
149	Prime Chains			62	12.83
448	Button Cycles		csfpython	2	18.11
257	Missing Records in SQL			40	13.57
292	Factorial Trailing Zeroes			33	13.90
233	Language Study			43	13.45
405	Three Friendly Knights		csfpython	10	15.86
178	Maze of the Wumpus			53	13.09
389	Binary Split Guessing Game		csfpython	13	15.44
147	Color Cubes Advanced			58	12.94
409	Election Fever		csfpython	9	16.02
376	Cartesian Tree Visualization			15	15.21
118	Maxit Single-Player			62	12.83
307	The Problem of Too Many Clues		zelevin	27	14.23
180	Simple Game of Sticks			48	13.26
330	Easter Bunnies Are Back		gardengnome	22	14.58
223	Introducing Scheme			40	13.57
408	Mad Beaver in River Labyrinth			8	16.21
255	LCM of a range			33	13.90
388	Fibonacci Guessing Game			11	15.71
338	Throwing Easter Eggs		gardengnome	19	14.82
299	Tree Visualizer			25	14.36
324	Merge Sort			21	14.65
229	Burrows-Wheeler Transform			36	13.75
247	Towers of Hanoi			33	13.90
183	Connect Four			43	13.45
393	Urban Planning		csfpython	10	15.86
354	Too Many Divisors		csfpython	16	15.10
347	Unwanted Multiples		csfpython	17	15.00
352	Hurkle			16	15.10
297	Collatz in the Range			24	14.43
443	Football League Tables		csfpython	2	18.11
296	Tree Value	RU	csfpython	24	14.43
416	Socket Server		testuser	6	16.64
375	Space Invaders			12	15.57
415	Smallest Message		gardengnome	6	16.64
284	Rotate Array In-Place			25	14.36
270	Hexlife			27	14.23
386	Advent Calendar Chocolate		gardengnome	10	15.86
392	Fixing an Anagram			9	16.02
363	Language Detector			13	15.44
413	Tree Painting		csfpython	6	16.64
290	Every Leaf on Every Tree		zelevin	23	14.50
398	Collecting Diamonds		csfpython	8	16.21
340	Zeckendorf Lite		csfpython	16	15.10
339	Parking Lot			16	15.10
353	Hurkle Hunter			14	15.32
287	Palindrome Frog		csfpython	23	14.50
441	Max versus Min		csfpython	2	18.11
382	Die Throw Sequences		csfpython	10	15.86
367	Roguelike 1d			12	15.57
238	Bear Hunt			29	14.11
395	Growth of Micro-Organisms		csfpython	8	16.21
349	Burrows		gardengnome	14	15.32
402	Game of Stones		csfpython	7	16.41
256	Rook Jump Maze			26	14.30
417	Unfortunate Bubble Sort		gardengnome	5	16.91
217	Personality Swap			31	14.00
286	Self-Printing Program			22	14.58
331	Rotating Toy Display		csfpython	16	15.10
362	Euclid, Manhattan and Chebyshev			12	15.57
346	Long Decimal Fractions		csfpython	14	15.32
298	Revoltle		zelevin	20	14.73
243	Grille Encryption			27	14.23
234	Train Merge			28	14.17
249	Turing Increment			26	14.30
169	Automated Landing			36	13.75
312	The Shredder Conundrum		zelevin	18	14.91
383	E2C2S - try harder!		gardengnome	9	16.02
358	Mandelbrot Set			12	15.57
261	Easter Bunnies 2D		gardengnome	24	14.43
357	Ulam's Prime Spiral			12	15.57
282	Predictable Board Game		csfpython	21	14.65
430	Cutting Paper		csfpython	3	17.61
268	Logic Transformation			22	14.58
300	Run-Length Encoding			18	14.91
271	A Knight some Trolls and a Princess		csfpython	21	14.65
419	Special Digits		csfpython	4	17.23
313	Seven Segment Decoder			16	15.10
410	Village Door Shuffle		csfpython	5	16.91
285	Rotate Matrix In Place			19	14.82
361	Rogue Mazes			10	15.86
275	Three Buckets			19	14.82
387	Big Numbers		csfpython	7	16.41
250	Turing Clone			21	14.65
404	Methane Normalization		moxieman	5	16.91
394	Many Shortest Routes		csfpython	6	16.64
344	Throwing Easter Eggs Part 2		gardengnome	11	15.71
213	Micro-Life	SK		24	14.43
422	Mabinogion Sheep		moxieman	3	17.61
319	Tower of Hanoi Rules		csfpython	13	15.44
326	Sum Them Forth			12	15.57
220	Neural Network Training			22	14.58
314	The Sorites Solution		zelevin	13	15.44
260	Low Cost Road Network		csfpython	18	14.91
332	Easter Bunnies 2D Are Back		gardengnome	11	15.71
341	Zeckendorf Advanced		csfpython	10	15.86
221	XWords		quandray	20	14.73
336	Currency Arbitrage			10	15.86
289	The Case of the Desperate Mastermind		zelevin	14	15.32
231	Dice Black Jack			19	14.82
262	Easter Bunnies 2D Advanced		gardengnome	16	15.10
380	Treap Study			6	16.64
295	Vigenere Cipher Cracker			13	15.44
222	Easter Eggs Advanced			19	14.82
306	Line Drawing Algorithm			12	15.57
378	Space Invaders Automation			6	16.64
316	Apogee			11	15.71
365	Flower Border Arrangements		csfpython	7	16.41
254	Rule 30 by Turing			16	15.10
303	Towers Under Cover			12	15.57
276	Lucky Pairs		csfpython	14	15.32
288	Langton's Ant		csfpython	13	15.44
263	Easter Bunnies 3D		gardengnome	15	15.21
424	New Towers of Hanoi		csfpython	2	18.11
345	Elliptic Curves Basics			8	16.21
266	Pancake Sorting			14	15.32
343	Village of Ticks			8	16.21
242	Comment Stripper			15	15.21
311	The Mirror Maze		zelevin	10	15.86
309	Board Game Sequences		csfpython	10	15.86
350	Colourful Egg Sequences		gardengnome	7	16.41
279	Two Buckets Advanced		csfpython	12	15.57
235	Train Merge Advanced			15	15.21
320	Accordion		pearlbarley	9	16.02
391	Scout Proficiency Badges		csfpython	4	17.23
333	Happy Triplets			8	16.21
327	Dobbin's Long Journey		csfpython	8	16.21
325	Ultimate Sort Trial			8	16.21
305	The Catacombs of Chronos		zelevin	9	16.02
237	Road Network Destruction			13	15.44
267	Turing Maze			11	15.71
397	Trading Bot			3	17.61
396	Chocolate Triangles and BF		moxieman	3	17.61
227	Hashtable Implementation			13	15.44
328	Beep Beep Beep			7	16.41
310	Board Game Sequences Advanced		csfpython	8	16.21
308	Circle Drawing Algorithm			8	16.21
342	Adaptive Arithmetic Coding			6	16.64
252	Shadok and Gibis			11	15.71
322	Gray Decoder			7	16.41
304	Ordered Brackets		csfpython	8	16.21
215	Klotski	SK		13	15.44
264	Party Presents		csfpython	10	15.86
225	Hamurabi			12	15.57
370	Jewels			4	17.23
369	Flappy Bird			4	17.23
226	Multiplicative Persistence Backtrace			11	15.71
224	Transposing List of Lists			11	15.71
283	Predictable Board Game on 10 Boards		csfpython	8	16.21
321	Hanoi Tower Heights		csfpython	6	16.64
278	Polyomino Generation			8	16.21
251	Radio Spies			9	16.02
248	Christmas Puzzle			9	16.02
355	Robots Game			4	17.23
239	Foxes and Geese			9	16.02
373	Railroad Rat		csfpython	3	17.61
280	Three Buckets Re-visited		csfpython	7	16.41
348	Trick-Taking Game			4	17.23
302	Sound-Controlled Robot			6	16.64
232	Shift Register Randomizer			9	16.02
272	Hexplore			7	16.41
240	Playfair Cipher Cracking			8	16.21
236	Is the Earth Flat			8	16.21
356	Robots Game Autoplay			3	17.61
273	Logic Glitches			6	16.64
317	Launch to Orbit			4	17.23
228	Maze Mapping Robot			6	16.64
318	Launch to Orbit automated			2	18.11