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 RU212341.00
2Sum in LoopDE ES FR AR ZH RO RU136631.77
3Sums in LoopDE ES FR AR ZH RO RU106232.20
4Minimum of TwoDE ES FR AR ZH RO RU92672.44
5Minimum of ThreeDE ES FR AR ZH RO RU83232.63
15Maximum of arrayDE ES AR ZH RO RU74322.82
6RoundingDE ES AR ZH RO RU68222.97
7Fahrenheit to CelsiusDE ES AR ZH RO RU63543.10
20Vowel CountDE ES AR ZH RO RU53273.40
11Sum of digitsES RU47863.59
41Median of ThreeDE AR ZH RO RU47183.61
28Body Mass IndexDE ZH RU45593.67
8Arithmetic ProgressionES RU43103.77
13Weighted sum of digitsES RU42263.80
43Dice RollingDE ZH RU41793.82
9TrianglesES RU40893.86
16Average of an arrayES RU40153.89
17Array ChecksumES RU36724.05
30Reverse StringRU35554.10
21Array CountersES RU34964.13
48Collatz SequenceRU31384.32
12Modulo and time differenceES RU28704.48
10Linear FunctionES RU28694.48
14Modular CalculatorES28654.48
27Bubble SortRU26214.63
26Greatest Common DivisorRU23964.79
29Sort with IndexesRU21824.95
23Bubble in ArrayRU20795.04
18Square RootES RU20475.06
24Neumann's Random GeneratorDE RU19355.16
67Fibonacci SequenceRU19155.18
50PalindromesDE RU19055.19
31Rotate StringRU18525.24
57Smoothing the WeatherRU18145.27
52Pythagorean TheoremRU17715.31
68Bicycle RaceRU17115.37
32Josephus ProblemRU15725.52
35Savings Calculator14805.63
25Linear Congruential GeneratorRU14795.63
44Double Dice RollRU14565.65
81Bit CountRU14175.70
47Caesar Shift Cipher13625.77
19Matching BracketsES RU13605.77
104Triangle Area12655.90
55Matching Words12545.91
49Rock Paper Scissors12295.95
61Prime Numbers GenerationRU11956.00
58Card Names11776.02
94Fool's Day 201410826.17
59Bulls and Cows10746.18
22Two PrintersRU10506.22
128Combinations Counting9976.31
33Parity ControlRU9326.43
42Blackjack Counting9296.43
38Quadratic Equation8896.51
34Binary Search8786.53
120Selection Sort8206.65
53King and Queen8076.68
45Cards Shuffling7596.79
63Integer Factorization7006.93
37Mortgage Calculator6677.01
46Tic-Tac-Toe6657.01
72Funny Words Generator6577.04
69Fibonacci Divisibility6457.07
62Prime Ranges5747.27
39Share Price Volatility5737.27
121Insertion Sort5507.34
134Flying Text Screensaver5227.43
127Anagrams5027.50
75Yacht or Dice Poker4907.54
114Tricky Printing4747.60
74Clock Hands4467.71
36Code Guesser4407.73
171Tree Height Measurement4017.89
73Hexagonal Grid3937.93
156Luhn Algorithm3847.97
54Pythagorean Triples3827.98
80Duel Chances3738.02
116Summing Up3558.10
51Dungeons and Dragons Dice3408.18
97Girls and Pigs3318.22
135Variable Length Code3248.26
105Convex Polygon Area3208.28
172Cloud Altitude Measurement3148.31
122QuickSort3138.32
85Rotation in 2D Space3018.39
70Most Frequent Word2968.42
56Life is Simple2958.42
66Caesar Cipher Cracker2938.43
40Paths in the Grid2838.49
98Azimuth at Treasure Island2758.54
145Modular Exponentiation2578.66
87Tree Builder2568.67
77Point to Segment Distance2358.82
86Brainfuck Interpreter2348.82
181Reverse Polish Notation2278.88
88Pitch and Notes2268.88
60Sweet Harvest2248.90
119Brain Fibo2248.90
187Static Web Page2248.90
82Levenshtein Distance2218.92
188Basics of HTML2158.97
64Maze Pathfinder2089.03
91Game of 20482089.03
95Simple Linear Regression1969.13
92Binary Heap1809.28
71Fibonacci Divisibility Advanced1779.31
101Gradient Calculation1739.35
83Graph Generator1709.38
89Instrument Tuner1709.38
126Sequence of Squares1699.39
79Cycles Detection1689.40
90Lexicographic Permutations1629.46
117Divide by Two1589.50
176Say 1001569.52
108Star Medals1539.56
131Four Pics One Word1529.57
150Introducing Regexps1509.59
78Bezier Curves1499.60
65Transitive Closure on Candy States1459.65
143Extended Euclidean Algorithm1449.66
167Copy Line1449.66
195Mul Two1449.66
189Dynamic Web Page1419.70
207Suffix Array1379.75
136Variable Length Code Unpack1349.79
99Uphill Shooting1289.87
211Information Entropy1209.98
191Spaceship Weight Fraud11810.01
154Breadth First Search11710.02
170Binary Search in Array11410.07
84Dijkstra in the Network11310.08
76Pawn Move Validator11010.13
103Easter Eggs10810.16
96Snake Arcade10710.17
197Loops in Assembly10710.17
133Billiard Ball10410.22
155Depth First Search10410.22
93Starving Priority Queue10210.26
206Base-32 Encoding10010.29
125Bogosort9910.31
161Topological Sorting9610.36
123Knapsack of Integers9310.42
144Modular Inverse9310.42
165Safe Landing9310.42
190Query String Parameters9310.42
109Lucky Tickets9210.43
140Proper Bracket Sequences8310.61
174Calculation of Pi8310.61
138Huffman Coding8110.65
129Enumerating Combinations8010.67
146Color Cubes7910.70
130Combinations with Repetitions7710.74
151Word Ladders7510.78
110Lucky Tickets Advanced7110.88
137Shannon-Fano Coding7010.90
173Chords of Music7010.90
164Page Rank6910.93
168Caesar meets BF6710.98
106Random Search Optimization6411.06
152RSA Cryptography6211.11
139Beam Balance and Masses6011.17
148Public Key Cryptography Intro5911.20
199Employees Web App5811.22
124Knapsack Backtracking5711.25
184Matches Picking5711.25
111Necklace Count5611.28
194Convex Hull and Farmers5611.28
102Travelling Salesman5511.32
198Prn Hex Str5511.32
201Point in Polygon5511.32
160Social Web Scraper5311.38
162Rubik's Cube5211.41
100Crossing the Road5011.48
177Nim Game4911.51
208Neighborhood of a String4911.51
159Hard Life4811.55
192Gangster Battles4711.58
112Travelling Salesman Inverted4611.62
158Hamming Codes4611.62
179Look and Say binary4511.66
196Fibonacci Randomizer4411.70
185Simple 3D Scene4311.73
157Emirp primE4211.77
182Frodo and Black Riders4111.82
202Dancing Pairs3911.90
115Gradient Descent for SLE3811.94
153Fermat goes hacking RSA3811.94
141Sliding Window Search3612.04
142LZ77 decompression3612.04
166Page Rank as Eigenvector3512.08
186Simple 3D Scene (cont)3512.08
210Ticket Puzzle3512.08
107Knight's Tour3412.13
113Ground Zero3412.13
203Tic-Tac-Toe Minimax Algorithm3412.13
193Maximum Flow3312.18
132Stream Cipher Breaking3212.23
149Prime Chains3212.23
163Colliding Balls3112.29
175Algae Robot3112.29
200Fizz Buzz in Asm2812.46
147Color Cubes Advanced2712.52
118Maxit Single-Player2612.58
205Clustering the Stars2612.58
204Wandering Star2412.72
209Suffix Array Advanced2412.72
212BCD to Hex2412.72
180Simple Game of Sticks2013.02
178Maze of the Wumpus1813.19
169Automated Landing1513.49
183Connect Four1413.60
213Micro-Life1113.99