Problems

Note that you can solve most task in any order!
Already solved ones are at the bottom of the table.

Solve more and win a certificate


Id Title Translations Solved Blessing
1Sum "A+B"DE ES FR AR ZH RO RU235971.00
2Sum in LoopDE ES FR AR ZH RO RU151361.77
3Sums in LoopDE ES FR AR ZH RO RU117562.21
4Minimum of TwoDE ES FR AR ZH RO RU102362.45
5Minimum of ThreeDE ES FR AR ZH RO RU91792.64
15Maximum of arrayDE ES AR ZH RO RU81562.85
6RoundingDE ES AR ZH RO RU75022.99
7Fahrenheit to CelsiusDE ES AR ZH RO RU69823.12
20Vowel CountDE ES AR ZH RO RU58083.44
11Sum of digitsES RU52903.60
41Median of ThreeDE AR ZH RO RU50983.66
28Body Mass IndexDE ZH RU49423.72
8Arithmetic ProgressionES RU47793.77
13Weighted sum of digitsES RU45983.84
9TrianglesES RU45153.87
43Dice RollingDE ZH RU44733.89
16Average of an arrayES RU43583.93
17Array ChecksumES RU39994.08
30Reverse StringRU38724.14
21Array CountersES RU38004.17
48Collatz SequenceRU33904.37
10Linear FunctionES RU31994.47
12Modulo and time differenceES RU31604.49
14Modular CalculatorES30944.53
27Bubble SortRU28414.68
26Greatest Common DivisorRU26284.81
29Sort with IndexesRU23804.98
23Bubble in ArrayRU22805.06
18Square RootES RU22675.07
24Neumann's Random GeneratorDE RU21135.19
50PalindromesDE RU20925.21
67Fibonacci SequenceRU20815.22
31Rotate StringRU20395.25
57Smoothing the WeatherRU19755.31
52Pythagorean TheoremRU19415.34
68Bicycle RaceRU18755.40
32Josephus ProblemRU17245.54
35Savings Calculator16425.63
25Linear Congruential GeneratorRU16355.64
44Double Dice RollRU15915.68
81Bit CountRU15455.73
19Matching BracketsES RU15285.75
47Caesar Shift Cipher14855.80
55Matching Words13815.93
104Triangle Area13755.94
49Rock Paper Scissors13445.98
61Prime Numbers GenerationRU13016.03
58Card Names12866.05
94Fool's Day 201411846.20
59Bulls and Cows11776.21
22Two PrintersRU11636.23
128Combinations Counting10796.36
33Parity ControlRU10336.43
42Blackjack Counting10236.45
38Quadratic Equation9756.53
34Binary Search9596.56
120Selection Sort9046.66
53King and Queen8826.71
45Cards Shuffling8356.80
63Integer Factorization7696.95
46Tic-Tac-Toe7427.01
37Mortgage Calculator7347.03
72Funny Words Generator7197.06
69Fibonacci Divisibility7127.08
62Prime Ranges6297.29
39Share Price Volatility6267.30
121Insertion Sort6017.37
134Flying Text Screensaver5667.48
75Yacht or Dice Poker5537.52
127Anagrams5517.52
114Tricky Printing5187.63
74Clock Hands4867.74
36Code Guesser4807.76
171Tree Height Measurement4437.90
73Hexagonal Grid4287.96
156Luhn Algorithm4267.97
54Pythagorean Triples4188.00
80Duel Chances4118.03
116Summing Up3848.15
51Dungeons and Dragons Dice3788.18
97Girls and Pigs3668.23
135Variable Length Code3538.30
105Convex Polygon Area3508.31
172Cloud Altitude Measurement3398.37
122QuickSort3378.38
56Life is Simple3268.43
85Rotation in 2D Space3258.44
70Most Frequent Word3238.45
66Caesar Cipher Cracker3178.48
40Paths in the Grid3058.55
98Azimuth at Treasure Island2978.59
145Modular Exponentiation2798.70
87Tree Builder2758.73
86Brainfuck Interpreter2628.81
77Point to Segment Distance2538.87
88Pitch and Notes2488.91
60Sweet Harvest2438.94
181Reverse Polish Notation2438.94
119Brain Fibo2408.96
82Levenshtein Distance2398.97
187Static Web Page2398.97
188Basics of HTML2309.04
91Game of 20482239.09
64Maze Pathfinder2229.10
95Simple Linear Regression2139.17
71Fibonacci Divisibility Advanced1919.36
101Gradient Calculation1909.37
92Binary Heap1889.39
89Instrument Tuner1859.41
79Cycles Detection1839.43
126Sequence of Squares1839.43
83Graph Generator1809.46
90Lexicographic Permutations1729.54
117Divide by Two1699.57
108Star Medals1679.59
78Bezier Curves1639.63
150Introducing Regexps1629.64
143Extended Euclidean Algorithm1619.65
131Four Pics One Word1589.69
176Say 1001569.71
65Transitive Closure on Candy States1559.72
167Copy Line1549.73
189Dynamic Web Page1519.76
195Mul Two1509.78
207Suffix Array1509.78
136Variable Length Code Unpack1489.80
99Uphill Shooting1409.89
211Information Entropy1349.97
191Spaceship Weight Fraud12610.08
154Breadth First Search12410.10
84Dijkstra in the Network12010.16
170Binary Search in Array12010.16
103Easter Eggs11910.17
96Snake Arcade11810.19
76Pawn Move Validator11710.20
133Billiard Ball11110.29
93Starving Priority Queue11010.31
155Depth First Search11010.31
197Loops in Assembly11010.31
206Base-32 Encoding11010.31
125Bogosort10510.39
161Topological Sorting10210.44
165Safe Landing10210.44
144Modular Inverse10010.47
123Knapsack of Integers9710.53
190Query String Parameters9710.53
109Lucky Tickets9410.58
174Calculation of Pi8910.67
140Proper Bracket Sequences8810.69
146Color Cubes8710.71
138Huffman Coding8510.75
129Enumerating Combinations8410.77
130Combinations with Repetitions8310.79
151Word Ladders8110.84
173Chords of Music8010.86
164Page Rank7510.97
137Shannon-Fano Coding7410.99
110Lucky Tickets Advanced7311.01
168Caesar meets BF7211.04
139Beam Balance and Masses7011.09
152RSA Cryptography6911.11
106Random Search Optimization6711.16
148Public Key Cryptography Intro6511.21
184Matches Picking6411.24
194Convex Hull and Farmers6311.27
124Knapsack Backtracking6011.35
199Employees Web App6011.35
111Necklace Count5911.38
102Travelling Salesman5811.41
192Gangster Battles5811.41
198Prn Hex Str5811.41
201Point in Polygon5811.41
160Social Web Scraper5711.44
208Neighborhood of a String5711.44
162Rubik's Cube5611.47
100Crossing the Road5311.56
158Hamming Codes5211.59
159Hard Life5011.66
179Look and Say binary5011.70
177Nim Game4911.70
112Travelling Salesman Inverted4811.73
182Frodo and Black Riders4811.73
202Dancing Pairs4811.73
157Emirp primE4611.80
185Simple 3D Scene4611.80
196Fibonacci Randomizer4611.80
115Gradient Descent for SLE4511.84
153Fermat goes hacking RSA4311.92
141Sliding Window Search4211.96
142LZ77 decompression4012.04
210Ticket Puzzle3912.08
166Page Rank as Eigenvector3812.13
186Simple 3D Scene (cont)3812.13
107Knight's Tour3712.17
113Ground Zero3712.17
175Algae Robot3712.17
193Maximum Flow3612.22
203Tic-Tac-Toe Minimax Algorithm3612.22
132Stream Cipher Breaking3512.27
149Prime Chains3312.37
163Colliding Balls3212.42
147Color Cubes Advanced3012.53
200Fizz Buzz in Asm3012.53
118Maxit Single-Player2812.64
205Clustering the Stars2812.64
204Wandering Star2712.70
209Suffix Array Advanced2612.77
180Simple Game of Sticks2512.83
212BCD to Hex2512.83
178Maze of the Wumpus1813.38
169Automated Landing1613.57
183Connect Four1413.79
213Micro-Life1313.91