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Problems
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Id
Title
Translations
Author
Solved
Blessing
28
Body Mass Index
DE
ES
ZH
RU
SK
10388
3.86
13
Weighted sum of digits
DE
ES
RU
ZH
SK
9884
3.95
17
Array Checksum
DE
ES
RU
SK
8671
4.17
48
Collatz Sequence
DE
ES
RU
SK
7052
4.53
12
Modulo and time difference
DE
ES
RU
SK
7160
4.51
18
Square Root
ES
RU
5598
4.93
29
Sort with Indexes
RU
5412
4.99
50
Palindromes
DE
ES
RU
SK
4946
5.15
52
Pythagorean Theorem
RU
4742
5.22
67
Fibonacci Sequence
RU
4299
5.39
24
Neumann's Random Generator
DE
ES
RU
4628
5.26
104
Triangle Area
3370
5.82
35
Savings Calculator
4057
5.49
81
Bit Count
RU
3422
5.79
44
Double Dice Roll
RU
3802
5.61
32
Josephus Problem
RU
3905
5.56
128
Combinations Counting
2676
6.22
19
Matching Brackets
ES
RU
3642
5.68
58
Card Names
3249
5.88
49
Rock Paper Scissors
3281
5.86
94
Fool's Day 2014
SK
2776
6.15
59
Bulls and Cows
2871
6.09
61
Prime Numbers Generation
RU
2827
6.12
22
Two Printers
ES
RU
3028
6.00
42
Blackjack Counting
2596
6.27
120
Selection Sort
2039
6.69
409
Election Fever
csfpython
6
16.55
38
Quadratic Equation
2393
6.41
33
Parity Control
RU
2345
6.45
53
King and Queen
2100
6.64
34
Binary Search
2161
6.59
69
Fibonacci Divisibility
1862
6.85
37
Mortgage Calculator
ZH
2030
6.70
45
Cards Shuffling
ZH
1974
6.74
63
Integer Factorization
ZH
1786
6.92
46
Tic-Tac-Toe
ZH
1831
6.87
62
Prime Ranges
1633
7.07
121
Insertion Sort
1349
7.41
172
Cloud Altitude Measurement
1089
7.78
75
Yacht or Dice Poker
1509
7.21
127
Anagrams
1274
7.50
134
Flying Text Screensaver
1180
7.64
39
Share Price Volatility
1510
7.21
156
Luhn Algorithm
SK
999
7.93
80
Duel Chances
1138
7.70
407
River Labyrinth
9
15.93
135
Variable Length Code
891
8.13
74
Clock Hands
1075
7.80
36
Code Guesser
UA
1170
7.65
105
Convex Polygon Area
920
8.07
408
Mad Beaver in River Labyrinth
5
16.81
54
Pythagorean Triples
1038
7.86
73
Hexagonal Grid
948
8.02
116
Summing Up
813
8.28
97
Girls and Pigs
847
8.21
181
Reverse Polish Notation
585
8.85
385
Number of steps in Euclidean Algorithm
gardengnome
60
12.79
122
QuickSort
681
8.59
98
Azimuth at Treasure Island
734
8.46
85
Rotation in 2D Space
738
8.45
51
Dungeons and Dragons Dice
UA
800
8.31
399
Methane Identification
moxieman
23
14.41
56
Life is Simple
771
8.38
40
Paths in the Grid
UA
772
8.37
70
Most Frequent Word
709
8.52
66
Caesar Cipher Cracker
709
8.52
377
Sum of Digits Divisibility
66
12.62
88
Pitch and Notes
650
8.67
406
Wormholes of Cygnus
moxieman
7
16.31
108
Star Medals
599
8.81
95
Simple Linear Regression
584
8.86
211
Information Entropy
368
9.66
87
Tree Builder
592
8.83
405
Three Friendly Knights
csfpython
8
16.11
60
Sweet Harvest
629
8.73
207
Suffix Array
364
9.68
77
Point to Segment Distance
586
8.85
143
Extended Euclidean Algorithm
436
9.36
71
Fibonacci Divisibility Advanced
547
8.97
91
Game of 2048
512
9.09
400
Memory Check
15
15.11
191
Spaceship Weight Fraud
344
9.78
119
Brain Fibo
456
9.29
101
Gradient Calculation
479
9.20
206
Base-32 Encoding
309
9.96
82
Levenshtein Distance
489
9.17
89
Instrument Tuner
458
9.28
131
Four Pics One Word
386
9.58
64
Maze Pathfinder
475
9.22
189
Dynamic Web Page
300
10.01
79
Cycles Detection
438
9.36
92
Binary Heap
415
9.45
150
Introducing Regexps
330
9.85
126
Sequence of Squares
355
9.72
136
Variable Length Code Unpack
341
9.79
170
Binary Search in Array
291
10.06
167
Copy Line
292
10.06
83
Graph Generator
393
9.54
197
Loops in Assembly
255
10.29
90
Lexicographic Permutations
378
9.61
154
Breadth First Search
295
10.04
78
Bezier Curves
379
9.61
117
Divide by Two
321
9.90
99
Uphill Shooting
336
9.82
65
Transitive Closure on Candy States
365
9.67
144
Modular Inverse
274
10.17
155
Depth First Search
258
10.27
174
Calculation of Pi
236
10.43
404
Methane Normalization
moxieman
5
16.81
161
Topological Sorting
243
10.38
165
Safe Landing
230
10.47
133
Billiard Ball
260
10.26
190
Query String Parameters
202
10.70
140
Proper Bracket Sequences
243
10.38
76
Pawn Move Validator
293
10.05
323
Next Palindrome
csfpython
75
12.40
96
Snake Arcade
273
10.18
384
Equal Hamming Distance
csfpython
21
14.56
123
Knapsack of Integers
240
10.40
93
Starving Priority Queue
263
10.24
130
Combinations with Repetitions
229
10.48
360
Whisky Blending
csfpython
40
13.48
84
Dijkstra in the Network
266
10.22
173
Chords of Music
192
10.78
125
Bogosort
231
10.46
390
Card Pairing Solitaire
15
15.11
337
Introducing Zeckendorf
csfpython
55
12.93
381
Finding Squares
csfpython
21
14.56
146
Color Cubes
198
10.73
151
Word Ladders
190
10.80
372
String Minimization
27
14.14
208
Neighborhood of a String
145
11.27
129
Enumerating Combinations
197
10.74
164
Page Rank
172
10.97
138
Huffman Coding
187
10.83
194
Convex Hull and Farmers
147
11.25
139
Beam Balance and Masses
182
10.88
201
Point in Polygon
138
11.35
199
Employees Web App
139
11.34
192
Gangster Battles
136
11.38
152
RSA Cryptography
161
11.09
359
Find 3 Numbers
csfpython
31
13.91
137
Shannon-Fano Coding
170
10.99
402
Game of Stones
csfpython
4
17.13
111
Necklace Count
177
10.92
393
Urban Planning
csfpython
9
15.93
398
Collecting Diamonds
csfpython
6
16.55
168
Caesar meets BF
134
11.41
110
Lucky Tickets Advanced
166
11.04
269
Fibonacci coding
73
12.45
202
Dancing Pairs
108
11.78
179
Look and Say binary
120
11.60
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
143
11.29
106
Random Search Optimization
150
11.21
182
Frodo and Black Riders
112
11.71
177
Nim Game
112
11.71
253
Beautiful Line Chart
75
12.40
185
Simple 3D Scene
107
11.79
160
Social Web Scraper
117
11.64
102
Travelling Salesman
140
11.33
157
Emirp primE
114
11.68
158
Hamming Codes
112
11.71
392
Fixing an Anagram
7
16.31
258
Text Justification
65
12.65
291
Squirrels vs. Acorns
zelevin
49
13.13
379
Dice with Infinity Sides
telebashna
12
15.47
159
Hard Life
103
11.86
281
Basic Tokenizer
51
13.06
196
Fibonacci Randomizer
85
12.19
395
Growth of Micro-Organisms
csfpython
5
16.81
277
The Adventure of Morse Code
zelevin
52
13.03
351
Nicomachus
22
14.48
153
Fermat goes hacking RSA
99
11.93
100
Crossing the Road
116
11.65
186
Simple 3D Scene (cont)
83
12.23
115
Gradient Descent for SLE
109
11.76
141
Sliding Window Search
98
11.94
335
Venus Visible
26
14.20
376
Cartesian Tree Visualization
11
15.61
210
Ticket Puzzle
69
12.55
209
Suffix Array Advanced
69
12.55
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
383
E2C2S - try harder!
gardengnome
8
16.11
219
Neural Network Calculation
62
12.73
382
Die Throw Sequences
csfpython
8
16.11
216
Cracking Linear Congruential Generator
61
12.76
112
Travelling Salesman Inverted
92
12.05
397
Trading Bot
3
17.52
113
Ground Zero
89
12.11
334
Find all of the SETs
csfpython
22
14.48
274
Two Buckets
40
13.48
363
Language Detector
13
15.34
132
Stream Cipher Breaking
80
12.29
163
Colliding Balls
70
12.52
396
Chocolate Triangles and BF
moxieman
3
17.52
175
Algae Robot
66
12.62
205
Clustering the Stars
57
12.87
367
Roguelike 1d
11
15.61
200
Fizz Buzz in Asm
57
12.87
107
Knight's Tour
82
12.25
354
Too Many Divisors
csfpython
14
15.22
230
Move-To-Front Transform
47
13.20
204
Wandering Star
53
13.00
212
BCD to Hex
50
13.10
241
Village Ways
42
13.39
347
Unwanted Multiples
csfpython
15
15.11
257
Missing Records in SQL
37
13.61
218
Rain Must Fall
DE
45
13.28
149
Prime Chains
60
12.79
307
The Problem of Too Many Clues
zelevin
23
14.41
233
Language Study
40
13.48
358
Mandelbrot Set
11
15.61
349
Burrows
gardengnome
13
15.34
357
Ulam's Prime Spiral
11
15.61
361
Rogue Mazes
10
15.76
338
Throwing Easter Eggs
gardengnome
15
15.11
178
Maze of the Wumpus
50
13.10
378
Space Invaders Automation
6
16.55
147
Color Cubes Advanced
55
12.93
391
Scout Proficiency Badges
csfpython
3
17.52
118
Maxit Single-Player
60
12.79
362
Euclid, Manhattan and Chebyshev
9
15.93
180
Simple Game of Sticks
46
13.24
223
Introducing Scheme
37
13.61
380
Treap Study
5
16.81
299
Tree Visualizer
21
14.56
255
LCM of a range
29
14.02
229
Burrows-Wheeler Transform
33
13.80
340
Zeckendorf Lite
csfpython
12
15.47
183
Connect Four
41
13.43
247
Towers of Hanoi
29
14.02
339
Parking Lot
12
15.47
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
238
Bear Hunt
26
14.20
217
Personality Swap
29
14.02
286
Self-Printing Program
18
14.81
234
Train Merge
25
14.27
169
Automated Landing
33
13.80
268
Logic Transformation
19
14.72
275
Three Buckets
18
14.81
256
Rook Jump Maze
20
14.64
285
Rotate Matrix In Place
16
15.00
336
Currency Arbitrage
9
15.93
243
Grille Encryption
21
14.56
271
A Knight some Trolls and a Princess
csfpython
17
14.91
213
Micro-Life
SK
24
14.33
306
Line Drawing Algorithm
12
15.47
345
Elliptic Curves Basics
7
16.31
369
Flappy Bird
4
17.13
333
Happy Triplets
8
16.11
220
Neural Network Training
21
14.56
260
Low Cost Road Network
csfpython
16
15.00
365
Flower Border Arrangements
csfpython
4
17.13
263
Easter Bunnies 3D
gardengnome
15
15.11
373
Railroad Rat
csfpython
3
17.52
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
14.91
355
Robots Game
4
17.13
222
Easter Eggs Advanced
16
15.00
308
Circle Drawing Algorithm
8
16.11
342
Adaptive Arithmetic Coding
5
16.81
235
Train Merge Advanced
14
15.22
237
Road Network Destruction
12
15.47
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
15.93
264
Party Presents
csfpython
9
15.93
227
Hashtable Implementation
11
15.61
226
Multiplicative Persistence Backtrace
11
15.61
225
Hamurabi
11
15.61
302
Sound-Controlled Robot
6
16.55
348
Trick-Taking Game
3
17.52
248
Christmas Puzzle
9
15.93
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
16.55
251
Radio Spies
7
16.31
232
Shift Register Randomizer
7
16.31
240
Playfair Cipher Cracking
6
16.55
280
Three Buckets Re-visited
csfpython
4
17.13
228
Maze Mapping Robot
5
16.81
318
Launch to Orbit automated
2
18.02