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Problems
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Id
Title
Translations
Author
Solved
Blessing
28
Body Mass Index
DE
ES
ZH
RU
SK
10373
3.86
13
Weighted sum of digits
DE
ES
RU
ZH
SK
9873
3.95
17
Array Checksum
DE
ES
RU
SK
8663
4.17
48
Collatz Sequence
DE
ES
RU
SK
7044
4.53
12
Modulo and time difference
DE
ES
RU
SK
7149
4.51
18
Square Root
ES
RU
5589
4.93
29
Sort with Indexes
RU
5401
4.99
50
Palindromes
DE
ES
RU
SK
4938
5.15
52
Pythagorean Theorem
RU
4733
5.22
67
Fibonacci Sequence
RU
4293
5.39
24
Neumann's Random Generator
DE
ES
RU
4618
5.27
104
Triangle Area
3366
5.81
35
Savings Calculator
4048
5.49
81
Bit Count
RU
3416
5.79
44
Double Dice Roll
RU
3795
5.61
32
Josephus Problem
RU
3897
5.56
128
Combinations Counting
2673
6.21
19
Matching Brackets
ES
RU
3635
5.68
58
Card Names
3243
5.88
49
Rock Paper Scissors
3274
5.86
94
Fool's Day 2014
SK
2771
6.15
59
Bulls and Cows
2864
6.09
61
Prime Numbers Generation
RU
2820
6.12
22
Two Printers
ES
RU
3019
6.00
42
Blackjack Counting
2592
6.27
120
Selection Sort
2036
6.69
38
Quadratic Equation
2390
6.41
33
Parity Control
RU
2341
6.45
53
King and Queen
2094
6.64
34
Binary Search
2155
6.59
69
Fibonacci Divisibility
1857
6.85
37
Mortgage Calculator
ZH
2022
6.70
45
Cards Shuffling
ZH
1965
6.75
63
Integer Factorization
ZH
1781
6.92
46
Tic-Tac-Toe
ZH
1826
6.88
62
Prime Ranges
1627
7.08
121
Insertion Sort
1345
7.41
172
Cloud Altitude Measurement
1085
7.78
127
Anagrams
1272
7.50
75
Yacht or Dice Poker
1505
7.21
134
Flying Text Screensaver
1178
7.64
39
Share Price Volatility
1505
7.21
156
Luhn Algorithm
SK
996
7.93
407
River Labyrinth
6
16.54
80
Duel Chances
1135
7.70
135
Variable Length Code
889
8.13
74
Clock Hands
1070
7.80
36
Code Guesser
UA
1165
7.66
105
Convex Polygon Area
917
8.07
408
Mad Beaver in River Labyrinth
2
18.01
54
Pythagorean Triples
1036
7.86
73
Hexagonal Grid
945
8.02
116
Summing Up
813
8.28
97
Girls and Pigs
846
8.21
181
Reverse Polish Notation
584
8.85
385
Number of steps in Euclidean Algorithm
gardengnome
59
12.81
399
Methane Identification
moxieman
23
14.40
122
QuickSort
680
8.59
98
Azimuth at Treasure Island
730
8.47
406
Wormholes of Cygnus
moxieman
6
16.54
85
Rotation in 2D Space
735
8.46
51
Dungeons and Dragons Dice
UA
795
8.32
56
Life is Simple
769
8.38
377
Sum of Digits Divisibility
66
12.62
70
Most Frequent Word
705
8.53
40
Paths in the Grid
UA
767
8.38
66
Caesar Cipher Cracker
706
8.53
88
Pitch and Notes
646
8.68
405
Three Friendly Knights
csfpython
7
16.31
108
Star Medals
595
8.82
211
Information Entropy
367
9.66
95
Simple Linear Regression
581
8.86
87
Tree Builder
591
8.83
207
Suffix Array
364
9.67
60
Sweet Harvest
625
8.74
400
Memory Check
15
15.11
77
Point to Segment Distance
585
8.85
143
Extended Euclidean Algorithm
435
9.37
71
Fibonacci Divisibility Advanced
546
8.97
91
Game of 2048
510
9.09
191
Spaceship Weight Fraud
342
9.78
119
Brain Fibo
455
9.29
101
Gradient Calculation
476
9.21
206
Base-32 Encoding
309
9.96
82
Levenshtein Distance
488
9.17
89
Instrument Tuner
456
9.28
131
Four Pics One Word
386
9.57
64
Maze Pathfinder
473
9.22
189
Dynamic Web Page
300
10.01
79
Cycles Detection
436
9.36
92
Binary Heap
414
9.45
150
Introducing Regexps
329
9.85
126
Sequence of Squares
354
9.72
136
Variable Length Code Unpack
341
9.79
170
Binary Search in Array
291
10.06
167
Copy Line
292
10.06
197
Loops in Assembly
255
10.29
83
Graph Generator
391
9.55
404
Methane Normalization
moxieman
5
16.81
90
Lexicographic Permutations
376
9.62
154
Breadth First Search
294
10.04
78
Bezier Curves
378
9.61
117
Divide by Two
321
9.89
99
Uphill Shooting
334
9.82
65
Transitive Closure on Candy States
362
9.68
144
Modular Inverse
273
10.17
155
Depth First Search
258
10.27
174
Calculation of Pi
236
10.42
161
Topological Sorting
243
10.37
133
Billiard Ball
260
10.26
165
Safe Landing
229
10.48
190
Query String Parameters
202
10.69
140
Proper Bracket Sequences
243
10.37
384
Equal Hamming Distance
csfpython
21
14.55
76
Pawn Move Validator
291
10.06
96
Snake Arcade
272
10.18
323
Next Palindrome
csfpython
74
12.42
123
Knapsack of Integers
239
10.40
93
Starving Priority Queue
262
10.24
130
Combinations with Repetitions
228
10.48
84
Dijkstra in the Network
265
10.22
173
Chords of Music
192
10.78
125
Bogosort
231
10.46
360
Whisky Blending
csfpython
39
13.52
381
Finding Squares
csfpython
21
14.55
337
Introducing Zeckendorf
csfpython
55
12.93
372
String Minimization
27
14.13
146
Color Cubes
198
10.73
151
Word Ladders
190
10.80
208
Neighborhood of a String
145
11.27
402
Game of Stones
csfpython
4
17.13
129
Enumerating Combinations
197
10.74
164
Page Rank
172
10.97
138
Huffman Coding
186
10.84
194
Convex Hull and Farmers
147
11.24
390
Card Pairing Solitaire
12
15.47
139
Beam Balance and Masses
182
10.87
201
Point in Polygon
138
11.35
199
Employees Web App
139
11.34
359
Find 3 Numbers
csfpython
31
13.90
192
Gangster Battles
136
11.38
152
RSA Cryptography
161
11.09
393
Urban Planning
csfpython
9
15.92
137
Shannon-Fano Coding
169
11.00
111
Necklace Count
176
10.93
110
Lucky Tickets Advanced
166
11.03
168
Caesar meets BF
133
11.42
398
Collecting Diamonds
csfpython
5
16.81
269
Fibonacci coding
73
12.45
202
Dancing Pairs
108
11.77
179
Look and Say binary
119
11.61
198
Prn Hex Str
109
11.76
162
Rubik's Cube
126
11.51
148
Public Key Cryptography Intro
133
11.42
124
Knapsack Backtracking
142
11.30
182
Frodo and Black Riders
112
11.71
106
Random Search Optimization
149
11.22
253
Beautiful Line Chart
75
12.40
177
Nim Game
112
11.71
185
Simple 3D Scene
106
11.81
160
Social Web Scraper
117
11.64
392
Fixing an Anagram
7
16.31
102
Travelling Salesman
139
11.34
157
Emirp primE
113
11.70
158
Hamming Codes
111
11.73
258
Text Justification
65
12.65
395
Growth of Micro-Organisms
csfpython
5
16.81
291
Squirrels vs. Acorns
zelevin
49
13.13
159
Hard Life
103
11.86
281
Basic Tokenizer
51
13.06
196
Fibonacci Randomizer
85
12.19
277
The Adventure of Morse Code
zelevin
52
13.03
379
Dice with Infinity Sides
telebashna
11
15.61
153
Fermat goes hacking RSA
99
11.92
351
Nicomachus
21
14.55
100
Crossing the Road
115
11.67
115
Gradient Descent for SLE
109
11.76
186
Simple 3D Scene (cont)
82
12.25
141
Sliding Window Search
97
11.96
335
Venus Visible
26
14.20
376
Cartesian Tree Visualization
11
15.61
210
Ticket Puzzle
69
12.54
209
Suffix Array Advanced
69
12.54
383
E2C2S - try harder!
gardengnome
8
16.11
166
Page Rank as Eigenvector
83
12.23
193
Maximum Flow
73
12.45
142
LZ77 decompression
89
12.11
203
Tic-Tac-Toe Minimax Algorithm
68
12.57
397
Trading Bot
3
17.52
219
Neural Network Calculation
61
12.75
112
Travelling Salesman Inverted
92
12.05
216
Cracking Linear Congruential Generator
59
12.81
363
Language Detector
13
15.34
113
Ground Zero
89
12.11
274
Two Buckets
40
13.47
382
Die Throw Sequences
csfpython
7
16.31
334
Find all of the SETs
csfpython
21
14.55
132
Stream Cipher Breaking
80
12.29
163
Colliding Balls
70
12.52
175
Algae Robot
66
12.62
367
Roguelike 1d
11
15.61
205
Clustering the Stars
56
12.90
200
Fizz Buzz in Asm
57
12.87
354
Too Many Divisors
csfpython
14
15.22
107
Knight's Tour
81
12.27
230
Move-To-Front Transform
47
13.20
204
Wandering Star
53
12.99
212
BCD to Hex
50
13.09
347
Unwanted Multiples
csfpython
15
15.11
241
Village Ways
42
13.39
257
Missing Records in SQL
36
13.65
218
Rain Must Fall
DE
45
13.27
358
Mandelbrot Set
11
15.61
307
The Problem of Too Many Clues
zelevin
23
14.40
149
Prime Chains
60
12.78
396
Chocolate Triangles and BF
moxieman
2
18.01
357
Ulam's Prime Spiral
11
15.61
361
Rogue Mazes
10
15.76
233
Language Study
39
13.52
378
Space Invaders Automation
6
16.54
338
Throwing Easter Eggs
gardengnome
15
15.11
391
Scout Proficiency Badges
csfpython
3
17.52
349
Burrows
gardengnome
12
15.47
178
Maze of the Wumpus
49
13.13
147
Color Cubes Advanced
55
12.93
362
Euclid, Manhattan and Chebyshev
9
15.92
380
Treap Study
5
16.81
118
Maxit Single-Player
59
12.81
180
Simple Game of Sticks
46
13.24
223
Introducing Scheme
37
13.60
299
Tree Visualizer
20
14.63
229
Burrows-Wheeler Transform
33
13.80
340
Zeckendorf Lite
csfpython
12
15.47
255
LCM of a range
28
14.07
183
Connect Four
41
13.43
339
Parking Lot
12
15.47
247
Towers of Hanoi
29
14.01
344
Throwing Easter Eggs Part 2
gardengnome
10
15.76
270
Hexlife
22
14.48
341
Zeckendorf Advanced
csfpython
10
15.76
284
Rotate Array In-Place
19
14.72
217
Personality Swap
29
14.01
286
Self-Printing Program
18
14.81
238
Bear Hunt
25
14.26
234
Train Merge
25
14.26
268
Logic Transformation
19
14.72
275
Three Buckets
18
14.81
169
Automated Landing
33
13.80
285
Rotate Matrix In Place
16
15.00
243
Grille Encryption
21
14.55
256
Rook Jump Maze
19
14.72
271
A Knight some Trolls and a Princess
csfpython
17
14.90
213
Micro-Life
SK
24
14.33
306
Line Drawing Algorithm
12
15.47
369
Flappy Bird
4
17.13
345
Elliptic Curves Basics
7
16.31
336
Currency Arbitrage
8
16.11
333
Happy Triplets
8
16.11
220
Neural Network Training
21
14.55
260
Low Cost Road Network
csfpython
16
15.00
365
Flower Border Arrangements
csfpython
4
17.13
373
Railroad Rat
csfpython
3
17.52
263
Easter Bunnies 3D
gardengnome
15
15.11
262
Easter Bunnies 2D Advanced
gardengnome
15
15.11
266
Pancake Sorting
14
15.22
370
Jewels
3
17.52
279
Two Buckets Advanced
csfpython
12
15.47
328
Beep Beep Beep
7
16.31
254
Rule 30 by Turing
14
15.22
221
XWords
quandray
17
14.90
355
Robots Game
4
17.13
222
Easter Eggs Advanced
16
15.00
342
Adaptive Arithmetic Coding
5
16.81
308
Circle Drawing Algorithm
8
16.11
235
Train Merge Advanced
14
15.22
356
Robots Game Autoplay
3
17.52
327
Dobbin's Long Journey
csfpython
5
16.81
215
Klotski
SK
13
15.34
267
Turing Maze
9
15.92
237
Road Network Destruction
11
15.61
264
Party Presents
csfpython
9
15.92
227
Hashtable Implementation
11
15.61
226
Multiplicative Persistence Backtrace
11
15.61
302
Sound-Controlled Robot
6
16.54
225
Hamurabi
11
15.61
248
Christmas Puzzle
9
15.92
224
Transposing List of Lists
10
15.76
252
Shadok and Gibis
8
16.11
317
Launch to Orbit
4
17.13
236
Is the Earth Flat
8
16.11
273
Logic Glitches
6
16.54
251
Radio Spies
7
16.31
348
Trick-Taking Game
2
18.01
232
Shift Register Randomizer
7
16.31
240
Playfair Cipher Cracking
6
16.54
280
Three Buckets Re-visited
csfpython
4
17.13
228
Maze Mapping Robot
5
16.81
318
Launch to Orbit automated
2
18.01