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 RU199041.00
2Sum in LoopDE ES FR AR ZH RO RU128121.77
3Sums in LoopDE ES FR AR ZH RO RU99542.20
4Minimum of TwoDE ES FR AR ZH RO RU86782.44
5Minimum of ThreeDE ES FR AR ZH RO RU78062.63
15Maximum of arrayDE ES AR ZH RO RU69622.82
6RoundingDE ES AR ZH RO RU63682.98
7Fahrenheit to CelsiusDE ES AR ZH RO RU59433.10
20Vowel CountDE ES AR ZH RO RU49903.40
41Median of ThreeDE AR ZH RO RU44433.60
11Sum of digitsES RU44333.61
28Body Mass IndexDE ZH RU42943.66
8Arithmetic ProgressionES RU39863.79
13Weighted sum of digitsES RU39563.81
43Dice RollingDE ZH RU39513.81
9TrianglesES RU37783.89
16Average of an arrayES RU37563.90
17Array ChecksumES RU34354.05
30Reverse StringRU33254.11
21Array CountersES RU32724.14
48Collatz SequenceRU29404.32
14Modular CalculatorES26854.48
12Modulo and time differenceES RU26604.50
10Linear FunctionES RU26554.50
27Bubble SortRU24464.64
26Greatest Common DivisorRU22254.81
29Sort with IndexesRU20194.97
23Bubble in ArrayRU19115.07
18Square RootES RU18895.09
67Fibonacci SequenceRU18105.16
24Neumann's Random GeneratorDE RU18045.17
50PalindromesDE RU17945.18
31Rotate StringRU17265.25
57Smoothing the WeatherRU17155.26
52Pythagorean TheoremRU16515.32
68Bicycle RaceRU16135.36
32Josephus ProblemRU14755.52
35Savings Calculator13855.63
25Linear Congruential GeneratorRU13735.64
44Double Dice RollRU13725.65
81Bit CountRU13345.69
47Caesar Shift Cipher12895.75
19Matching BracketsES RU12745.77
55Matching Words11975.88
104Triangle Area11935.89
49Rock Paper Scissors11565.94
61Prime Numbers GenerationRU11365.97
58Card Names11106.01
94Fool's Day 201410286.15
59Bulls and Cows10116.18
22Two PrintersRU9776.23
128Combinations Counting9386.31
42Blackjack Counting8676.44
33Parity ControlRU8606.46
38Quadratic Equation8296.52
34Binary Search8166.55
120Selection Sort7776.63
53King and Queen7656.66
45Cards Shuffling7146.78
63Integer Factorization6546.93
37Mortgage Calculator6247.01
72Funny Words Generator6217.02
46Tic-Tac-Toe6157.04
69Fibonacci Divisibility6067.06
62Prime Ranges5457.25
39Share Price Volatility5267.31
121Insertion Sort5167.34
134Flying Text Screensaver4887.44
127Anagrams4707.50
114Tricky Printing4577.55
75Yacht or Dice Poker4557.56
74Clock Hands4137.73
36Code Guesser4127.73
171Tree Height Measurement3687.93
73Hexagonal Grid3657.94
156Luhn Algorithm3607.97
54Pythagorean Triples3518.01
80Duel Chances3498.02
116Summing Up3438.05
51Dungeons and Dragons Dice3218.16
97Girls and Pigs3148.20
122QuickSort3018.28
135Variable Length Code2998.29
105Convex Polygon Area2948.32
172Cloud Altitude Measurement2898.35
70Most Frequent Word2848.38
85Rotation in 2D Space2818.39
66Caesar Cipher Cracker2778.42
56Life is Simple2748.44
40Paths in the Grid2628.52
98Azimuth at Treasure Island2548.57
145Modular Exponentiation2458.63
87Tree Builder2418.66
86Brainfuck Interpreter2258.78
77Point to Segment Distance2238.79
187Static Web Page2188.83
119Brain Fibo2158.86
181Reverse Polish Notation2148.87
82Levenshtein Distance2138.87
60Sweet Harvest2108.90
188Basics of HTML2108.90
88Pitch and Notes2098.91
64Maze Pathfinder1949.04
91Game of 20481949.04
95Simple Linear Regression1849.13
92Binary Heap1719.25
71Fibonacci Divisibility Advanced1689.28
101Gradient Calculation1669.30
83Graph Generator1629.35
126Sequence of Squares1629.35
79Cycles Detection1619.36
89Instrument Tuner1589.39
90Lexicographic Permutations1569.41
176Say 1001569.41
117Divide by Two1489.50
131Four Pics One Word1459.54
78Bezier Curves1439.56
108Star Medals1439.56
150Introducing Regexps1419.59
65Transitive Closure on Candy States1409.60
143Extended Euclidean Algorithm1399.61
167Copy Line1389.62
189Dynamic Web Page1389.62
195Mul Two1379.64
207Suffix Array1339.69
136Variable Length Code Unpack1209.86
99Uphill Shooting1179.91
191Spaceship Weight Fraud1149.95
154Breadth First Search1129.98
211Information Entropy11110.00
84Dijkstra in the Network10910.03
170Binary Search in Array10710.06
103Easter Eggs10510.09
96Snake Arcade10210.14
197Loops in Assembly10210.14
133Billiard Ball9910.20
155Depth First Search9910.20
76Pawn Move Validator9810.21
93Starving Priority Queue9410.28
125Bogosort9410.28
161Topological Sorting9110.34
190Query String Parameters9010.36
206Base-32 Encoding8910.38
123Knapsack of Integers8710.42
144Modular Inverse8710.42
165Safe Landing8710.42
109Lucky Tickets8410.48
140Proper Bracket Sequences8010.56
129Enumerating Combinations7710.63
138Huffman Coding7510.67
130Combinations with Repetitions7310.72
174Calculation of Pi7310.72
146Color Cubes7210.74
151Word Ladders7110.77
110Lucky Tickets Advanced6610.89
168Caesar meets BF6310.97
137Shannon-Fano Coding6211.00
164Page Rank6211.00
173Chords of Music6211.00
139Beam Balance and Masses5711.14
106Random Search Optimization5611.17
199Employees Web App5611.17
148Public Key Cryptography Intro5511.20
152RSA Cryptography5511.20
184Matches Picking5511.20
194Convex Hull and Farmers5311.27
102Travelling Salesman5211.30
111Necklace Count5211.30
198Prn Hex Str5211.30
124Knapsack Backtracking5111.33
160Social Web Scraper5111.33
177Nim Game4911.40
201Point in Polygon4911.40
100Crossing the Road4811.44
162Rubik's Cube4811.44
208Neighborhood of a String4711.47
192Gangster Battles4611.51
159Hard Life4511.54
112Travelling Salesman Inverted4211.66
179Look and Say binary4211.66
196Fibonacci Randomizer4211.66
158Hamming Codes4011.74
185Simple 3D Scene4011.74
157Emirp primE3911.79
182Frodo and Black Riders3711.88
202Dancing Pairs3711.88
153Fermat goes hacking RSA3511.97
115Gradient Descent for SLE3412.02
142LZ77 decompression3412.02
141Sliding Window Search3312.07
107Knight's Tour3212.12
132Stream Cipher Breaking3212.12
113Ground Zero3112.18
186Simple 3D Scene (cont)3112.18
203Tic-Tac-Toe Minimax Algorithm3112.18
210Ticket Puzzle3112.18
149Prime Chains3012.23
163Colliding Balls3012.23
166Page Rank as Eigenvector3012.23
175Algae Robot2912.29
193Maximum Flow2912.29
200Fizz Buzz in Asm2812.35
147Color Cubes Advanced2612.47
118Maxit Single-Player2512.54
205Clustering the Stars2412.60
209Suffix Array Advanced2312.68
212BCD to Hex2312.68
204Wandering Star2212.75
180Simple Game of Sticks2012.91
178Maze of the Wumpus1813.08
169Automated Landing1513.38
183Connect Four1413.49
213Micro-Life1113.88