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 RU223831.00
2Sum in LoopDE ES FR AR ZH RO RU143951.77
3Sums in LoopDE ES FR AR ZH RO RU111852.21
4Minimum of TwoDE ES FR AR ZH RO RU97532.44
5Minimum of ThreeDE ES FR AR ZH RO RU87602.63
15Maximum of arrayDE ES AR ZH RO RU77862.83
6RoundingDE ES AR ZH RO RU71602.98
7Fahrenheit to CelsiusDE ES AR ZH RO RU66623.11
20Vowel CountDE ES AR ZH RO RU55573.42
11Sum of digitsES RU50403.59
41Median of ThreeDE AR ZH RO RU49103.64
28Body Mass IndexDE ZH RU47653.69
8Arithmetic ProgressionES RU45463.77
13Weighted sum of digitsES RU44113.82
43Dice RollingDE ZH RU43213.86
9TrianglesES RU43003.87
16Average of an arrayES RU41783.92
17Array ChecksumES RU38284.07
30Reverse StringRU37074.12
21Array CountersES RU36414.15
48Collatz SequenceRU32564.35
10Linear FunctionES RU30344.47
12Modulo and time differenceES RU30194.48
14Modular CalculatorES29704.51
27Bubble SortRU27364.65
26Greatest Common DivisorRU25054.80
29Sort with IndexesRU22814.97
23Bubble in ArrayRU21825.04
18Square RootES RU21635.06
24Neumann's Random GeneratorDE RU20275.17
50PalindromesDE RU20015.19
67Fibonacci SequenceRU19985.20
31Rotate StringRU19505.24
57Smoothing the WeatherRU18995.28
52Pythagorean TheoremRU18595.32
68Bicycle RaceRU17985.38
32Josephus ProblemRU16475.53
35Savings Calculator15665.62
25Linear Congruential GeneratorRU15555.63
44Double Dice RollRU15245.67
81Bit CountRU14835.71
19Matching BracketsES RU14375.77
47Caesar Shift Cipher14265.78
55Matching Words13205.92
104Triangle Area13145.92
49Rock Paper Scissors12845.96
61Prime Numbers GenerationRU12456.02
58Card Names12326.04
94Fool's Day 201411346.18
59Bulls and Cows11246.20
22Two PrintersRU10986.24
128Combinations Counting10376.33
42Blackjack Counting9806.43
33Parity ControlRU9796.43
38Quadratic Equation9316.52
34Binary Search9146.55
120Selection Sort8656.65
53King and Queen8466.69
45Cards Shuffling8036.78
63Integer Factorization7376.93
37Mortgage Calculator7047.01
46Tic-Tac-Toe7037.01
72Funny Words Generator6947.03
69Fibonacci Divisibility6867.05
39Share Price Volatility6047.27
62Prime Ranges6047.27
121Insertion Sort5737.36
134Flying Text Screensaver5437.46
127Anagrams5317.50
75Yacht or Dice Poker5237.52
114Tricky Printing4967.61
74Clock Hands4727.70
36Code Guesser4607.74
171Tree Height Measurement4277.87
73Hexagonal Grid4147.93
156Luhn Algorithm4077.96
54Pythagorean Triples4027.98
80Duel Chances4007.99
116Summing Up3748.10
51Dungeons and Dragons Dice3608.17
97Girls and Pigs3528.21
135Variable Length Code3398.27
105Convex Polygon Area3368.29
172Cloud Altitude Measurement3298.33
122QuickSort3248.35
85Rotation in 2D Space3158.40
70Most Frequent Word3138.41
56Life is Simple3128.42
66Caesar Cipher Cracker3088.44
40Paths in the Grid2918.54
98Azimuth at Treasure Island2868.57
145Modular Exponentiation2718.66
87Tree Builder2638.71
86Brainfuck Interpreter2528.79
77Point to Segment Distance2478.82
88Pitch and Notes2378.89
181Reverse Polish Notation2358.91
119Brain Fibo2338.92
60Sweet Harvest2318.94
82Levenshtein Distance2318.94
187Static Web Page2298.95
188Basics of HTML2209.02
91Game of 20482189.04
64Maze Pathfinder2169.05
95Simple Linear Regression2029.17
71Fibonacci Divisibility Advanced1849.33
92Binary Heap1849.33
101Gradient Calculation1809.37
126Sequence of Squares1799.38
89Instrument Tuner1789.39
79Cycles Detection1759.42
83Graph Generator1759.42
90Lexicographic Permutations1699.48
117Divide by Two1659.52
108Star Medals1629.55
78Bezier Curves1579.61
176Say 1001569.62
131Four Pics One Word1559.63
143Extended Euclidean Algorithm1549.64
150Introducing Regexps1549.64
65Transitive Closure on Candy States1529.66
167Copy Line1519.67
195Mul Two1479.72
189Dynamic Web Page1449.75
207Suffix Array1449.75
136Variable Length Code Unpack1419.79
99Uphill Shooting1349.88
211Information Entropy1269.98
191Spaceship Weight Fraud12210.04
154Breadth First Search12010.07
170Binary Search in Array12010.07
84Dijkstra in the Network11810.10
76Pawn Move Validator11610.13
96Snake Arcade11510.14
103Easter Eggs11410.16
197Loops in Assembly11010.22
93Starving Priority Queue10710.27
133Billiard Ball10710.27
155Depth First Search10710.27
206Base-32 Encoding10410.31
125Bogosort10210.35
161Topological Sorting9910.40
144Modular Inverse9710.43
165Safe Landing9710.43
190Query String Parameters9610.45
123Knapsack of Integers9410.49
109Lucky Tickets9310.51
174Calculation of Pi8610.64
140Proper Bracket Sequences8510.66
146Color Cubes8510.66
138Huffman Coding8410.68
129Enumerating Combinations8210.72
130Combinations with Repetitions7910.79
151Word Ladders7910.79
173Chords of Music7510.88
137Shannon-Fano Coding7310.92
164Page Rank7310.92
110Lucky Tickets Advanced7210.95
168Caesar meets BF7110.97
139Beam Balance and Masses6711.07
106Random Search Optimization6611.10
152RSA Cryptography6611.10
148Public Key Cryptography Intro6411.15
184Matches Picking6211.20
194Convex Hull and Farmers6211.20
199Employees Web App6011.26
124Knapsack Backtracking5911.29
111Necklace Count5811.32
198Prn Hex Str5811.32
102Travelling Salesman5711.35
201Point in Polygon5711.35
160Social Web Scraper5511.41
162Rubik's Cube5511.41
192Gangster Battles5511.41
208Neighborhood of a String5311.47
100Crossing the Road5211.50
158Hamming Codes5011.57
159Hard Life5011.57
177Nim Game4911.60
112Travelling Salesman Inverted4711.67
179Look and Say binary4611.71
196Fibonacci Randomizer4611.71
182Frodo and Black Riders4511.75
202Dancing Pairs4511.75
115Gradient Descent for SLE4411.79
157Emirp primE4411.79
185Simple 3D Scene4411.79
141Sliding Window Search4111.91
153Fermat goes hacking RSA4111.91
142LZ77 decompression3911.99
107Knight's Tour3712.08
113Ground Zero3712.08
166Page Rank as Eigenvector3712.08
210Ticket Puzzle3712.08
186Simple 3D Scene (cont)3612.13
132Stream Cipher Breaking3512.17
175Algae Robot3412.22
193Maximum Flow3412.22
203Tic-Tac-Toe Minimax Algorithm3412.22
149Prime Chains3312.27
163Colliding Balls3212.33
200Fizz Buzz in Asm3012.43
147Color Cubes Advanced2912.49
118Maxit Single-Player2712.61
205Clustering the Stars2712.61
209Suffix Array Advanced2612.67
212BCD to Hex2512.74
204Wandering Star2412.81
180Simple Game of Sticks2312.88
178Maze of the Wumpus1813.28
169Automated Landing1513.58
183Connect Four1413.70
213Micro-Life1313.82