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 RU158031.00
2Sum in LoopDE ES FR AR ZH RO RU101751.76
3Sums in LoopDE ES FR AR ZH RO RU78932.21
4Minimum of TwoDE ES FR AR ZH RO RU68572.45
5Minimum of ThreeDE ES FR AR ZH RO RU61842.63
15Maximum of arrayDE ES AR ZH RO RU55682.81
6RoundingDE ES AR ZH RO RU50592.98
7Fahrenheit to CelsiusDE ES AR ZH RO RU47043.10
20Vowel CountDE ES AR ZH RO RU40343.37
41Median of ThreeDE AR ZH RO RU35923.57
28Body Mass IndexDE ZH RU34973.62
11Sum of digitsES RU34693.63
43Dice RollingDE ZH RU32153.77
13Weighted sum of digitsES RU31773.79
8Arithmetic ProgressionES RU30473.86
16Average of an arrayES RU30123.88
9TrianglesES RU29133.94
17Array ChecksumES RU27704.02
21Array CountersES RU26464.10
30Reverse StringRU26384.11
48Collatz SequenceRU23864.28
14Modular CalculatorES21754.44
12Modulo and time differenceES RU20844.52
10Linear FunctionES RU20284.57
27Bubble SortRU20104.58
26Greatest Common DivisorRU17764.80
29Sort with IndexesRU16024.98
67Fibonacci SequenceRU15155.07
23Bubble in ArrayRU15055.08
24Neumann's Random GeneratorDE RU14825.11
18Square RootES RU14695.13
50PalindromesDE RU14555.14
57Smoothing the WeatherRU14105.20
31Rotate StringRU13645.25
52Pythagorean TheoremRU13055.33
68Bicycle RaceRU12945.35
32Josephus ProblemRU12215.45
35Savings Calculator11055.62
81Bit CountRU11035.62
44Double Dice RollRU10875.65
25Linear Congruential GeneratorRU10815.66
47Caesar Shift Cipher10415.72
19Matching BracketsES RU10015.79
55Matching Words9805.83
104Triangle Area9665.85
49Rock Paper Scissors9395.90
61Prime Numbers GenerationRU9185.94
58Card Names8906.00
59Bulls and Cows8336.11
94Fool's Day 20148266.13
128Combinations Counting7606.27
22Two PrintersRU7456.30
42Blackjack Counting7026.41
34Binary Search6806.46
33Parity ControlRU6736.48
38Quadratic Equation6656.50
120Selection Sort6576.52
53King and Queen6236.61
45Cards Shuffling5806.74
63Integer Factorization5286.90
72Funny Words Generator5116.96
69Fibonacci Divisibility5056.98
37Mortgage Calculator5036.99
46Tic-Tac-Toe4957.01
121Insertion Sort4307.26
39Share Price Volatility4227.29
134Flying Text Screensaver4117.34
62Prime Ranges4047.37
127Anagrams4017.38
114Tricky Printing3837.46
75Yacht or Dice Poker3797.48
74Clock Hands3357.69
36Code Guesser3187.78
73Hexagonal Grid3097.83
156Luhn Algorithm3067.85
54Pythagorean Triples2947.92
80Duel Chances2897.95
171Tree Height Measurement2887.95
116Summing Up2877.96
51Dungeons and Dragons Dice2658.10
122QuickSort2598.14
97Girls and Pigs2558.16
135Variable Length Code2538.18
105Convex Polygon Area2418.26
85Rotation in 2D Space2388.28
70Most Frequent Word2338.32
172Cloud Altitude Measurement2298.35
66Caesar Cipher Cracker2258.38
56Life is Simple2148.47
98Azimuth at Treasure Island2148.47
145Modular Exponentiation2118.49
87Tree Builder2058.54
40Paths in the Grid1968.62
77Point to Segment Distance1888.69
86Brainfuck Interpreter1868.71
119Brain Fibo1788.78
181Reverse Polish Notation1768.80
82Levenshtein Distance1748.82
187Static Web Page1738.83
88Pitch and Notes1728.84
188Basics of HTML1678.89
60Sweet Harvest1608.97
91Game of 20481588.99
95Simple Linear Regression1579.00
64Maze Pathfinder1569.01
176Say 1001569.01
92Binary Heap1479.11
101Gradient Calculation1439.16
71Fibonacci Divisibility Advanced1399.21
83Graph Generator1369.25
126Sequence of Squares1369.25
89Instrument Tuner1349.27
90Lexicographic Permutations1339.29
79Cycles Detection1289.35
108Star Medals1269.38
131Four Pics One Word1249.41
150Introducing Regexps1249.41
117Divide by Two1229.44
78Bezier Curves1199.48
143Extended Euclidean Algorithm1199.48
195Mul Two1169.52
65Transitive Closure on Candy States1089.65
167Copy Line1089.65
189Dynamic Web Page1089.65
207Suffix Array1089.65
136Variable Length Code Unpack1049.71
99Uphill Shooting1009.78
154Breadth First Search969.85
191Spaceship Weight Fraud939.90
211Information Entropy8810.00
84Dijkstra in the Network8610.04
170Binary Search in Array8610.04
96Snake Arcade8510.06
103Easter Eggs8310.10
155Depth First Search8310.10
197Loops in Assembly8310.10
93Starving Priority Queue8110.14
125Bogosort8110.14
133Billiard Ball8010.16
76Pawn Move Validator7810.20
109Lucky Tickets7510.27
144Modular Inverse7510.27
161Topological Sorting7310.32
123Knapsack of Integers7210.34
206Base-32 Encoding7110.37
165Safe Landing7010.39
190Query String Parameters6810.44
129Enumerating Combinations6710.47
140Proper Bracket Sequences6710.47
130Combinations with Repetitions6410.54
146Color Cubes6310.57
174Calculation of Pi6310.57
138Huffman Coding6110.63
110Lucky Tickets Advanced5910.68
151Word Ladders5910.68
137Shannon-Fano Coding5310.87
106Random Search Optimization5010.96
168Caesar meets BF5010.96
139Beam Balance and Masses4911.00
164Page Rank4911.00
173Chords of Music4911.00
177Nim Game4911.00
184Matches Picking4811.03
111Necklace Count4711.07
148Public Key Cryptography Intro4711.07
152RSA Cryptography4711.07
160Social Web Scraper4711.07
124Knapsack Backtracking4611.11
194Convex Hull and Farmers4611.11
198Prn Hex Str4411.18
201Point in Polygon4411.18
100Crossing the Road4211.26
102Travelling Salesman4211.26
159Hard Life4011.34
192Gangster Battles3911.39
199Employees Web App3911.39
208Neighborhood of a String3811.43
162Rubik's Cube3711.48
158Hamming Codes3511.57
157Emirp primE3411.62
185Simple 3D Scene3411.62
196Fibonacci Randomizer3411.62
112Travelling Salesman Inverted3311.67
179Look and Say binary3311.67
182Frodo and Black Riders3311.67
202Dancing Pairs3111.77
142LZ77 decompression3011.83
115Gradient Descent for SLE2911.89
141Sliding Window Search2811.95
153Fermat goes hacking RSA2712.01
163Colliding Balls2712.01
113Ground Zero2612.07
132Stream Cipher Breaking2612.07
210Ticket Puzzle2512.14
107Knight's Tour2412.20
166Page Rank as Eigenvector2412.20
186Simple 3D Scene (cont)2412.20
149Prime Chains2312.27
193Maximum Flow2312.27
200Fizz Buzz in Asm2312.27
147Color Cubes Advanced2212.35
175Algae Robot2212.35
203Tic-Tac-Toe Minimax Algorithm2112.43
205Clustering the Stars1912.59
118Maxit Single-Player1812.68
178Maze of the Wumpus1812.68
209Suffix Array Advanced1812.68
212BCD to Hex1812.68
180Simple Game of Sticks1612.87
204Wandering Star1512.98
183Connect Four1413.09
169Automated Landing1013.63
213Micro-Life813.98