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 RU166761.00
2Sum in LoopDE ES FR AR ZH RO RU107311.77
3Sums in LoopDE ES FR AR ZH RO RU83352.20
4Minimum of TwoDE ES FR AR ZH RO RU72592.44
5Minimum of ThreeDE ES FR AR ZH RO RU65362.63
15Maximum of arrayDE ES AR ZH RO RU58952.81
6RoundingDE ES AR ZH RO RU53552.97
7Fahrenheit to CelsiusDE ES AR ZH RO RU49873.10
20Vowel CountDE ES AR ZH RO RU42553.37
41Median of ThreeDE AR ZH RO RU37853.58
28Body Mass IndexDE ZH RU36803.62
11Sum of digitsES RU36623.63
43Dice RollingDE ZH RU33633.78
13Weighted sum of digitsES RU33373.79
8Arithmetic ProgressionES RU32373.85
16Average of an arrayES RU31593.89
9TrianglesES RU30783.93
17Array ChecksumES RU29004.04
30Reverse StringRU27794.11
21Array CountersES RU27664.12
48Collatz SequenceRU24944.30
14Modular CalculatorES22784.46
12Modulo and time differenceES RU21914.53
10Linear FunctionES RU21454.56
27Bubble SortRU20934.60
26Greatest Common DivisorRU18634.81
29Sort with IndexesRU16774.99
23Bubble in ArrayRU15865.09
67Fibonacci SequenceRU15775.10
24Neumann's Random GeneratorDE RU15545.12
18Square RootES RU15485.13
50PalindromesDE RU15245.16
57Smoothing the WeatherRU14655.22
31Rotate StringRU14385.26
52Pythagorean TheoremRU13685.34
68Bicycle RaceRU13475.37
32Josephus ProblemRU12655.48
35Savings Calculator11525.64
81Bit CountRU11415.66
44Double Dice RollRU11375.66
25Linear Congruential GeneratorRU11365.67
47Caesar Shift Cipher10855.75
19Matching BracketsES RU10535.80
55Matching Words10175.86
104Triangle Area9975.89
49Rock Paper Scissors9805.92
61Prime Numbers GenerationRU9565.96
58Card Names9296.01
59Bulls and Cows8606.15
94Fool's Day 20148506.17
22Two PrintersRU7956.28
128Combinations Counting7806.32
42Blackjack Counting7256.44
33Parity ControlRU7036.50
34Binary Search7006.51
38Quadratic Equation6866.54
120Selection Sort6766.57
53King and Queen6386.67
45Cards Shuffling5986.78
63Integer Factorization5386.96
72Funny Words Generator5257.00
69Fibonacci Divisibility5187.03
37Mortgage Calculator5177.03
46Tic-Tac-Toe5167.03
121Insertion Sort4447.30
39Share Price Volatility4397.31
134Flying Text Screensaver4227.38
62Prime Ranges4177.40
127Anagrams4117.43
114Tricky Printing3957.50
75Yacht or Dice Poker3877.53
74Clock Hands3467.73
36Code Guesser3377.77
156Luhn Algorithm3197.87
73Hexagonal Grid3157.89
54Pythagorean Triples3017.97
80Duel Chances2987.99
171Tree Height Measurement2968.00
116Summing Up2918.03
51Dungeons and Dragons Dice2718.15
122QuickSort2658.19
97Girls and Pigs2608.22
135Variable Length Code2588.24
105Convex Polygon Area2478.31
85Rotation in 2D Space2458.32
70Most Frequent Word2408.36
172Cloud Altitude Measurement2388.37
66Caesar Cipher Cracker2358.40
56Life is Simple2258.47
98Azimuth at Treasure Island2208.51
145Modular Exponentiation2138.57
87Tree Builder2088.61
40Paths in the Grid2068.62
77Point to Segment Distance1938.74
86Brainfuck Interpreter1918.76
181Reverse Polish Notation1828.84
187Static Web Page1828.84
82Levenshtein Distance1818.85
119Brain Fibo1818.85
88Pitch and Notes1768.90
188Basics of HTML1768.90
60Sweet Harvest1669.00
91Game of 20481659.01
64Maze Pathfinder1629.04
95Simple Linear Regression1619.05
176Say 1001569.10
92Binary Heap1529.15
101Gradient Calculation1469.22
71Fibonacci Divisibility Advanced1449.24
83Graph Generator1409.29
126Sequence of Squares1409.29
89Instrument Tuner1379.33
90Lexicographic Permutations1369.34
79Cycles Detection1349.37
131Four Pics One Word1309.42
150Introducing Regexps1299.43
108Star Medals1289.45
117Divide by Two1269.47
143Extended Euclidean Algorithm1239.51
78Bezier Curves1229.53
195Mul Two1199.57
65Transitive Closure on Candy States1159.63
207Suffix Array1149.65
167Copy Line1139.66
189Dynamic Web Page1139.66
136Variable Length Code Unpack1059.79
99Uphill Shooting1049.80
154Breadth First Search1009.87
191Spaceship Weight Fraud989.91
170Binary Search in Array949.98
211Information Entropy9210.01
84Dijkstra in the Network9110.03
103Easter Eggs9010.05
155Depth First Search8810.09
96Snake Arcade8710.11
197Loops in Assembly8710.11
125Bogosort8510.15
76Pawn Move Validator8310.19
93Starving Priority Queue8310.19
133Billiard Ball8310.19
144Modular Inverse7910.28
109Lucky Tickets7710.32
161Topological Sorting7710.32
123Knapsack of Integers7610.34
165Safe Landing7410.39
206Base-32 Encoding7410.39
190Query String Parameters7210.44
140Proper Bracket Sequences7010.48
129Enumerating Combinations6810.53
138Huffman Coding6610.58
146Color Cubes6610.58
174Calculation of Pi6510.61
130Combinations with Repetitions6410.64
151Word Ladders6210.69
110Lucky Tickets Advanced6010.75
137Shannon-Fano Coding5610.86
164Page Rank5510.90
168Caesar meets BF5410.93
173Chords of Music5310.96
139Beam Balance and Masses5210.99
184Matches Picking5111.02
106Random Search Optimization5011.06
111Necklace Count4911.09
148Public Key Cryptography Intro4911.09
160Social Web Scraper4911.09
177Nim Game4911.09
152RSA Cryptography4811.13
194Convex Hull and Farmers4811.13
124Knapsack Backtracking4711.16
198Prn Hex Str4611.20
201Point in Polygon4611.20
102Travelling Salesman4411.28
100Crossing the Road4311.31
159Hard Life4111.40
192Gangster Battles4111.40
208Neighborhood of a String4111.40
199Employees Web App4011.44
162Rubik's Cube3911.48
179Look and Say binary3711.57
112Travelling Salesman Inverted3611.62
196Fibonacci Randomizer3611.62
158Hamming Codes3511.66
185Simple 3D Scene3511.66
157Emirp primE3411.71
182Frodo and Black Riders3411.71
202Dancing Pairs3211.81
142LZ77 decompression3011.92
115Gradient Descent for SLE2911.98
141Sliding Window Search2911.98
163Colliding Balls2812.04
210Ticket Puzzle2812.04
153Fermat goes hacking RSA2712.10
107Knight's Tour2612.16
113Ground Zero2612.16
132Stream Cipher Breaking2612.16
166Page Rank as Eigenvector2612.16
149Prime Chains2512.23
186Simple 3D Scene (cont)2512.23
175Algae Robot2412.30
193Maximum Flow2412.30
200Fizz Buzz in Asm2412.30
203Tic-Tac-Toe Minimax Algorithm2312.37
147Color Cubes Advanced2212.44
118Maxit Single-Player1912.68
205Clustering the Stars1912.68
209Suffix Array Advanced1912.68
212BCD to Hex1912.68
178Maze of the Wumpus1812.77
180Simple Game of Sticks1712.87
204Wandering Star1513.07
183Connect Four1413.18
169Automated Landing1113.57
213Micro-Life814.07