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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		59474	1.00
2	Sum in Loop	DE ES FR AR ZH RO RU SK		36059	1.87
3	Sums in Loop	DE ES FR AR ZH RO RU SK		27494	2.34
4	Minimum of Two	DE ES FR AR ZH RO RU SK		23962	2.58
5	Minimum of Three	DE ES FR AR ZH RO RU SK		21459	2.77
15	Maximum of array	DE ES AR ZH RO RU SK		18755	3.00
6	Rounding	DE ES AR ZH RO RU SK		17195	3.16
7	Fahrenheit to Celsius	DE ES AR ZH RO RU SK		16469	3.23
20	Vowel Count	DE ES AR ZH RO RU SK		13375	3.59
11	Sum of digits	DE ES RU ZH SK		13309	3.60
8	Arithmetic Progression	DE ES RU ZH SK		12502	3.71
41	Median of Three	DE ES AR ZH RO RU SK		11452	3.86
9	Triangles	DE ES RU ZH SK		11945	3.79
28	Body Mass Index	DE ES ZH RU SK		11314	3.88
13	Weighted sum of digits	DE ES RU ZH SK		10802	3.96
43	Dice Rolling	DE ES ZH RU SK		9725	4.15
16	Average of an array	DE ES RU SK		10242	4.06
30	Reverse String	DE ES RU SK		9674	4.15
17	Array Checksum	DE ES RU SK		9518	4.18
21	Array Counters	DE ES RU SK		8861	4.31
10	Linear Function	DE ES RU SK		8612	4.36
48	Collatz Sequence	DE ES RU SK		7690	4.55
12	Modulo and time difference	DE ES RU SK		7817	4.52
14	Modular Calculator	ES SK		7230	4.66
27	Bubble Sort	ES RU SK		6559	4.83
26	Greatest Common Divisor	ES SK RU		6382	4.88
18	Square Root	ES RU		6207	4.93
29	Sort with Indexes	RU		5920	5.01
50	Palindromes	DE ES RU SK		5476	5.14
23	Bubble in Array	ES RU		5672	5.08
52	Pythagorean Theorem	RU		5257	5.21
31	Rotate String	ES RU		5433	5.16
67	Fibonacci Sequence	RU		4713	5.40
68	Bicycle Race	ES RU		4683	5.41
24	Neumann's Random Generator	DE ES RU		5075	5.28
57	Smoothing the Weather	ES RU		4674	5.42
35	Savings Calculator			4491	5.49
104	Triangle Area	ES		3758	5.80
25	Linear Congruential Generator	RU		4431	5.51
44	Double Dice Roll	RU		4203	5.60
32	Josephus Problem	RU		4307	5.56
81	Bit Count	RU		3770	5.79
19	Matching Brackets	ES RU		4080	5.65
58	Card Names			3603	5.87
49	Rock Paper Scissors			3659	5.84
47	Caesar Shift Cipher	SK		3658	5.84
128	Combinations Counting			2972	6.20
55	Matching Words			3523	5.91
94	Fool's Day 2014	SK		3075	6.15
59	Bulls and Cows			3186	6.08
61	Prime Numbers Generation	RU		3129	6.12
22	Two Printers	ES RU		3387	5.98
42	Blackjack Counting			2909	6.24
120	Selection Sort			2295	6.65
38	Quadratic Equation			2685	6.38
33	Parity Control	RU		2617	6.43
53	King and Queen			2346	6.62
34	Binary Search			2430	6.55
171	Tree Height Measurement			1632	7.25
37	Mortgage Calculator	ZH		2272	6.67
45	Cards Shuffling	ZH		2221	6.71
69	Fibonacci Divisibility			2061	6.84
63	Integer Factorization	ZH		1985	6.91
46	Tic-Tac-Toe	ZH		2040	6.86
62	Prime Ranges			1815	7.06
72	Funny Words Generator			1757	7.12
121	Insertion Sort			1531	7.36
75	Yacht or Dice Poker			1665	7.21
172	Cloud Altitude Measurement			1235	7.73
39	Share Price Volatility			1694	7.18
127	Anagrams			1361	7.56
134	Flying Text Screensaver			1265	7.69
156	Luhn Algorithm	SK		1111	7.91
114	Tricky Printing			1188	7.80
80	Duel Chances			1266	7.69
36	Code Guesser	UA		1355	7.57
74	Clock Hands			1192	7.79
135	Variable Length Code			997	8.10
54	Pythagorean Triples			1179	7.81
105	Convex Polygon Area			1031	8.04
73	Hexagonal Grid			1062	7.99
145	Modular Exponentiation			873	8.33
97	Girls and Pigs			948	8.19
116	Summing Up			868	8.34
181	Reverse Polish Notation			670	8.79
98	Azimuth at Treasure Island			827	8.43
122	QuickSort			764	8.56
51	Dungeons and Dragons Dice	UA		903	8.27
85	Rotation in 2D Space			831	8.42
499	Binary Frog		csfpython	1	18.89
40	Paths in the Grid	UA		913	8.25
187	Static Web Page			615	8.94
56	Life is Simple			863	8.35
188	Basics of HTML			586	9.02
66	Caesar Cipher Cracker			789	8.51
70	Most Frequent Word			779	8.53
88	Pitch and Notes			732	8.64
87	Tree Builder			697	8.72
108	Star Medals			644	8.86
60	Sweet Harvest			721	8.66
95	Simple Linear Regression			656	8.83
495	Counting Arithmetic Progressions		csfpython	7	16.48
77	Point to Segment Distance			667	8.80
428	Broken Keyboard			107	11.96
86	Brainfuck Interpreter			606	8.96
211	Information Entropy			421	9.60
71	Fibonacci Divisibility Advanced			624	8.91
91	Game of 2048			585	9.03
207	Suffix Array			412	9.63
101	Gradient Calculation			545	9.15
143	Extended Euclidean Algorithm			478	9.38
82	Levenshtein Distance			552	9.13
176	Say 100			425	9.58
191	Spaceship Weight Fraud			395	9.71
89	Instrument Tuner			515	9.25
119	Brain Fibo			476	9.38
480	Coin Payments		csfpython	24	14.51
206	Base-32 Encoding			366	9.84
154	Breadth First Search			428	9.57
64	Maze Pathfinder			539	9.17
195	Mul Two			373	9.81
79	Cycles Detection			509	9.27
92	Binary Heap			473	9.39
155	Depth First Search			388	9.74
83	Graph Generator			466	9.42
131	Four Pics One Word			411	9.64
485	Magic 3		csfpython	15	15.28
301	Skyscraper Price			208	10.82
136	Variable Length Code Unpack			373	9.81
90	Lexicographic Permutations			418	9.61
78	Bezier Curves			430	9.56
150	Introducing Regexps			350	9.92
494	Holiday Travel		csfpython	5	16.98
189	Dynamic Web Page			308	10.14
126	Sequence of Squares			370	9.82
65	Transitive Closure on Candy States			430	9.56
476	Prime Vowel Count		csfpython	22	14.65
167	Copy Line			315	10.10
385	Number of steps in Euclidean Algorithm		gardengnome	107	11.96
170	Binary Search in Array			308	10.14
487	Reduce and Equalise		csfpython	11	15.78
99	Uphill Shooting			368	9.83
161	Topological Sorting			306	10.15
197	Loops in Assembly			270	10.37
117	Divide by Two			341	9.96
144	Modular Inverse			310	10.13
461	Lucky 7		csfpython	33	13.97
377	Sum of Digits Divisibility			104	12.01
76	Pawn Move Validator			347	9.93
429	Moving Average in Time			57	13.04
174	Calculation of Pi			265	10.40
93	Starving Priority Queue			326	10.04
425	Explosive Breeding			59	12.98
133	Billiard Ball			289	10.25
96	Snake Arcade			311	10.12
140	Proper Bracket Sequences			275	10.33
165	Safe Landing			253	10.48
103	Easter Eggs			289	10.25
184	Matches Picking		quandray	229	10.65
84	Dijkstra in the Network			301	10.18
123	Knapsack of Integers			271	10.36
130	Combinations with Repetitions			253	10.48
481	Field Trip		csfpython	12	15.64
173	Chords of Music			221	10.71
444	White Rectangle			37	13.78
472	Unreachable Amounts		csfpython	18	14.98
109	Lucky Tickets			264	10.40
190	Query String Parameters			208	10.82
125	Bogosort			250	10.50
497	Crazy Timer			1	18.89
366	Image Cutting		oezguery	84	12.38
323	Next Palindrome		csfpython	110	11.92
492	Fastest Clearance		csfpython	4	17.30
471	Missing Digits		csfpython	17	15.08
146	Color Cubes			217	10.74
129	Enumerating Combinations			224	10.69
371	Pages to Print			77	12.53
151	Word Ladders			202	10.87
164	Page Rank			194	10.94
208	Neighborhood of a String			167	11.20
253	Beautiful Line Chart			141	11.49
139	Beam Balance and Masses			206	10.83
437	Elections and Happiness			35	13.87
493	Ternary Logic			3	17.69
360	Whisky Blending		csfpython	78	12.51
484	A Message from Deep Space		csfpython	8	16.28
374	Longest Common Subsequence			69	12.72
138	Huffman Coding			200	10.88
194	Convex Hull and Farmers			167	11.20
489	TV Charity Fundraiser		csfpython	5	16.98
201	Point in Polygon			160	11.27
433	A Crime on Logic Island		csfpython	35	13.87
337	Introducing Zeckendorf		csfpython	86	12.34
152	RSA Cryptography			183	11.04
111	Necklace Count			202	10.87
137	Shannon-Fano Coding			186	11.01
102	Travelling Salesman			204	10.85
496	Minimum Journey Cost		csfpython	1	18.89
498	Sum of Divisors Chaining			-	20.10
110	Lucky Tickets Advanced			193	10.95
192	Gangster Battles			150	11.38
399	Methane Identification		moxieman	48	13.34
269	Fibonacci coding			110	11.92
244	Introducing SQL			122	11.74
199	Employees Web App			142	11.48
468	The Garden of Words		zelevin	14	15.39
368	Number Base Palindrome		csfpython	60	12.96
329	Roman Arithmetic		csfpython	78	12.51
478	Robot Deliveries		csfpython	9	16.10
482	SS Numbers		csfpython	7	16.48
148	Public Key Cryptography Intro			155	11.32
106	Random Search Optimization			172	11.15
124	Knapsack Backtracking			162	11.25
294	Vigenere Cipher			87	12.32
245	Aggregations in SQL			107	11.96
162	Rubik's Cube			141	11.49
168	Caesar meets BF			138	11.53
202	Dancing Pairs			123	11.72
214	Sick Travellers			116	11.82
179	Look and Say binary			130	11.63
490	Circuit Board Connections		csfpython	3	17.69
182	Frodo and Black Riders			123	11.72
198	Prn Hex Str			113	11.87
364	Arthur Engel's Randomizer			50	13.27
449	Space Pirates		csfpython	18	14.98
414	MIDI Variable Length Numbers			31	14.08
177	Nim Game			119	11.78
160	Social Web Scraper			125	11.70
246	Joins in SQL			93	12.20
158	Hamming Codes			125	11.70
258	Text Justification			88	12.30
185	Simple 3D Scene			113	11.87
359	Find 3 Numbers		csfpython	50	13.27
157	Emirp primE			123	11.72
418	Expected Number of Random Moves		moxieman	27	14.31
459	Number String Multiples of Thirteen		csfpython	13	15.51
372	String Minimization			42	13.56
401	Methane Rotation		moxieman	32	14.02
491	Lucky Number Scores		csfpython	2	18.19
488	Accurate Curve Fitting		csfpython	3	17.69
159	Hard Life			111	11.90
100	Crossing the Road			130	11.63
463	Crossing Towns		csfpython	11	15.78
466	Dictionary Entries		csfpython	10	15.93
153	Fermat goes hacking RSA			111	11.90
281	Basic Tokenizer			68	12.74
411	Elo Ratings		moxieman	27	14.31
115	Gradient Descent for SLE			119	11.78
291	Squirrels vs. Acorns		zelevin	64	12.85
265	Update in SQL			72	12.64
384	Equal Hamming Distance		csfpython	35	13.87
277	The Adventure of Morse Code		zelevin	67	12.77
477	Lottery Balls		csfpython	6	16.72
447	Fixed Product, Minimum Sum		csfpython	15	15.28
324	Merge Sort			52	13.20
141	Sliding Window Search			107	11.96
460	Carlsdale Caverns		csfpython	11	15.78
196	Fibonacci Randomizer			89	12.28
186	Simple 3D Scene (cont)			91	12.24
469	Game of Generals			8	16.28
112	Travelling Salesman Inverted			111	11.90
427	Cheapest Bus Tickets			20	14.81
193	Maximum Flow			87	12.32
458	Mountain Panorama		csfpython	11	15.78
166	Page Rank as Eigenvector			94	12.19
210	Ticket Puzzle			81	12.44
475	Medieval Medicine		zelevin	6	16.72
142	LZ77 decompression			99	12.10
209	Suffix Array Advanced			79	12.48
434	A Crime on Logic Island Advanced		csfpython	17	15.08
113	Ground Zero			104	12.01
452	Implication in Logic			12	15.64
474	Reachable Amounts		gardengnome	6	16.72
216	Cracking Linear Congruential Generator			74	12.60
203	Tic-Tac-Toe Minimax Algorithm			77	12.53
219	Neural Network Calculation			72	12.64
274	Two Buckets			57	13.04
457	Railroad and Hamilton			10	15.93
464	Graph to Loops Decomposition			8	16.28
107	Knight's Tour			97	12.13
351	Nicomachus			36	13.82
259	Easter Bunnies		gardengnome	58	13.01
132	Stream Cipher Breaking			89	12.28
467	Permutation Generator		csfpython	7	16.48
400	Memory Check			23	14.58
241	Village Ways			61	12.93
163	Colliding Balls			79	12.48
403	Hi-Lo dice game			22	14.65
483	Sixes and Sevens		csfpython	3	17.69
381	Finding Squares		csfpython	27	14.31
175	Algae Robot			74	12.60
293	Sums of Triplets			46	13.41
205	Clustering the Stars			65	12.82
406	Wormholes of Cygnus		moxieman	20	14.81
230	Move-To-Front Transform			58	13.01
445	Formula 1			11	15.78
335	Venus Visible			35	13.87
334	Find all of the SETs		csfpython	35	13.87
412	Json Fix			18	14.98
407	River Labyrinth			19	14.89
486	Two Colour Special Nim		csfpython	2	18.19
315	Count the Common Factors		csfpython	38	13.73
218	Rain Must Fall	DE		58	13.01
255	LCM of a range			50	13.27
442	Chomp			11	15.78
292	Factorial Trailing Zeroes			42	13.56
204	Wandering Star			60	12.96
446	Hangman			10	15.93
421	Princess and Tiger			15	15.28
435	Maze Mapping API-Robot			12	15.64
200	Fizz Buzz in Asm			59	12.98
149	Prime Chains			67	12.77
453	SR latch			8	16.28
212	BCD to Hex			54	13.14
390	Card Pairing Solitaire			20	14.81
257	Missing Records in SQL			45	13.45
436	Avoid the Grid Points		csfpython	11	15.78
233	Language Study			49	13.30
118	Maxit Single-Player			70	12.69
473	Skittles		csfpython	4	17.30
423	Russian Dolls		csfpython	13	15.51
307	The Problem of Too Many Clues		zelevin	34	13.92
450	Bead Games		csfpython	8	16.28
438	Maze Generator			10	15.93
223	Introducing Scheme			48	13.34
180	Simple Game of Sticks			55	13.10
247	Towers of Hanoi			43	13.52
379	Dice with Infinity Sides		telebashna	20	14.81
147	Color Cubes Advanced			60	12.96
178	Maze of the Wumpus			54	13.14
440	Mud Walker			9	16.10
229	Burrows-Wheeler Transform			44	13.48
439	Power Sum of Digits		csfpython	9	16.10
451	Maximize Toy Production		csfpython	7	16.48
420	Life on a String		csfpython	12	15.64
426	Weighted Sum of Digits 2		csfpython	11	15.78
376	Cartesian Tree Visualization			19	14.89
388	Fibonacci Guessing Game			17	15.08
299	Tree Visualizer			30	14.13
357	Ulam's Prime Spiral			21	14.73
347	Unwanted Multiples		csfpython	22	14.65
352	Hurkle			21	14.73
183	Connect Four			46	13.41
338	Throwing Easter Eggs		gardengnome	23	14.58
270	Hexlife			33	13.97
330	Easter Bunnies Are Back		gardengnome	24	14.51
389	Binary Split Guessing Game		csfpython	15	15.28
354	Too Many Divisors		csfpython	20	14.81
409	Election Fever		csfpython	12	15.64
465	Red Blue Hackenbush		csfpython	4	17.30
297	Collatz in the Range			28	14.25
349	Burrows		gardengnome	20	14.81
284	Rotate Array In-Place			29	14.19
362	Euclid, Manhattan and Chebyshev			18	14.98
296	Tree Value	RU	csfpython	27	14.31
405	Three Friendly Knights		csfpython	12	15.64
234	Train Merge			35	13.87
455	D flip-flop			5	16.98
256	Rook Jump Maze			31	14.08
286	Self-Printing Program			27	14.31
454	Multiplexer 4x4			5	16.98
339	Parking Lot			20	14.81
346	Long Decimal Fractions		csfpython	19	14.89
392	Fixing an Anagram			13	15.51
415	Smallest Message		gardengnome	10	15.93
353	Hurkle Hunter			18	14.98
290	Every Leaf on Every Tree		zelevin	26	14.37
243	Grille Encryption			32	14.02
287	Palindrome Frog		csfpython	26	14.37
238	Bear Hunt			32	14.02
268	Logic Transformation			28	14.25
340	Zeckendorf Lite		csfpython	19	14.89
217	Personality Swap			34	13.92
249	Turing Increment			30	14.13
312	The Shredder Conundrum		zelevin	22	14.65
393	Urban Planning		csfpython	12	15.64
261	Easter Bunnies 2D		gardengnome	28	14.25
417	Unfortunate Bubble Sort		gardengnome	9	16.10
367	Roguelike 1d			15	15.28
375	Space Invaders			14	15.39
298	Revoltle		zelevin	23	14.58
331	Rotating Toy Display		csfpython	19	14.89
169	Automated Landing			38	13.73
432	Ball Bearing Collisions		csfpython	7	16.48
361	Rogue Mazes			15	15.28
300	Run-Length Encoding			22	14.65
395	Growth of Micro-Organisms		csfpython	11	15.78
295	Vigenere Cipher Cracker			22	14.65
382	Die Throw Sequences		csfpython	12	15.64
363	Language Detector			14	15.39
408	Mad Beaver in River Labyrinth			9	16.10
250	Turing Clone			26	14.37
398	Collecting Diamonds		csfpython	10	15.93
285	Rotate Matrix In Place			22	14.65
313	Seven Segment Decoder			19	14.89
275	Three Buckets			23	14.58
282	Predictable Board Game		csfpython	22	14.65
462	Rota Boards		csfpython	3	17.69
319	Tower of Hanoi Rules		csfpython	18	14.98
271	A Knight some Trolls and a Princess		csfpython	23	14.58
344	Throwing Easter Eggs Part 2		gardengnome	15	15.28
383	E2C2S - try harder!		gardengnome	11	15.78
314	The Sorites Solution		zelevin	18	14.98
431	King and Rook Checkmate			6	16.72
260	Low Cost Road Network		csfpython	23	14.58
470	Shogi Engine			2	18.19
419	Special Digits		csfpython	7	16.48
358	Mandelbrot Set			13	15.51
386	Advent Calendar Chocolate		gardengnome	10	15.93
448	Button Cycles		csfpython	4	17.30
479	Robot and the Wall			1	18.89
341	Zeckendorf Advanced		csfpython	14	15.39
231	Dice Black Jack			24	14.51
424	New Towers of Hanoi		csfpython	6	16.72
413	Tree Painting		csfpython	7	16.48
402	Game of Stones		csfpython	8	16.28
456	Every Third Bit			3	17.69
220	Neural Network Training			24	14.51
443	Football League Tables		csfpython	4	17.30
213	Micro-Life	SK		24	14.51
222	Easter Eggs Advanced			23	14.58
266	Pancake Sorting			19	14.89
336	Currency Arbitrage			13	15.51
441	Max versus Min		csfpython	4	17.30
416	Socket Server		testuser	6	16.72
404	Methane Normalization		moxieman	7	16.48
332	Easter Bunnies 2D Are Back		gardengnome	13	15.51
254	Rule 30 by Turing			19	14.89
289	The Case of the Desperate Mastermind		zelevin	16	15.18
263	Easter Bunnies 3D		gardengnome	18	14.98
262	Easter Bunnies 2D Advanced		gardengnome	18	14.98
387	Big Numbers		csfpython	8	16.28
221	XWords		quandray	21	14.73
410	Village Door Shuffle		csfpython	6	16.72
422	Mabinogion Sheep		moxieman	5	16.98
343	Village of Ticks			11	15.78
316	Apogee			13	15.51
288	Langton's Ant		csfpython	15	15.28
235	Train Merge Advanced			19	14.89
380	Treap Study			8	16.28
326	Sum Them Forth			12	15.64
311	The Mirror Maze		zelevin	13	15.51
391	Scout Proficiency Badges		csfpython	7	16.48
350	Colourful Egg Sequences		gardengnome	10	15.93
309	Board Game Sequences		csfpython	13	15.51
267	Turing Maze			16	15.18
279	Two Buckets Advanced		csfpython	15	15.28
320	Accordion		pearlbarley	12	15.64
306	Line Drawing Algorithm			13	15.51
333	Happy Triplets			11	15.78
305	The Catacombs of Chronos		zelevin	13	15.51
276	Lucky Pairs		csfpython	15	15.28
430	Cutting Paper		csfpython	4	17.30
304	Ordered Brackets		csfpython	13	15.51
303	Towers Under Cover			13	15.51
345	Elliptic Curves Basics			10	15.93
342	Adaptive Arithmetic Coding			10	15.93
264	Party Presents		csfpython	15	15.28
365	Flower Border Arrangements		csfpython	8	16.28
394	Many Shortest Routes		csfpython	6	16.72
242	Comment Stripper			16	15.18
224	Transposing List of Lists			17	15.08
237	Road Network Destruction			16	15.18
310	Board Game Sequences Advanced		csfpython	11	15.78
227	Hashtable Implementation			16	15.18
322	Gray Decoder			10	15.93
321	Hanoi Tower Heights		csfpython	10	15.93
369	Flappy Bird			7	16.48
397	Trading Bot			5	16.98
327	Dobbin's Long Journey		csfpython	9	16.10
378	Space Invaders Automation			6	16.72
325	Ultimate Sort Trial			9	16.10
302	Sound-Controlled Robot			10	15.93
283	Predictable Board Game on 10 Boards		csfpython	11	15.78
373	Railroad Rat		csfpython	6	16.72
225	Hamurabi			14	15.39
252	Shadok and Gibis			12	15.64
328	Beep Beep Beep			8	16.28
308	Circle Drawing Algorithm			9	16.10
278	Polyomino Generation			10	15.93
215	Klotski	SK		13	15.51
251	Radio Spies			11	15.78
370	Jewels			5	16.98
280	Three Buckets Re-visited		csfpython	9	16.10
273	Logic Glitches			9	16.10
226	Multiplicative Persistence Backtrace			11	15.78
236	Is the Earth Flat			10	15.93
232	Shift Register Randomizer			10	15.93
248	Christmas Puzzle			9	16.10
348	Trick-Taking Game			5	16.98
240	Playfair Cipher Cracking			9	16.10
396	Chocolate Triangles and BF		moxieman	3	17.69
239	Foxes and Geese			9	16.10
272	Hexplore			7	16.48
355	Robots Game			4	17.30
228	Maze Mapping Robot			8	16.28
356	Robots Game Autoplay			3	17.69
317	Launch to Orbit			4	17.30
318	Launch to Orbit automated			2	18.19