| Problem name | | In short | Forum |
| 102. 50237 - Is it the same color? |
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Check if the two items are on the same color on a chess board. |
Discussion (2) » |
| 103. 50238 - The smallest number |
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Discussion (1) » |
| 105. 50243 - Sum of digits |
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Discussion (1) » |
| 107a. 50240 - The numbers that are divisible by K |
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Discussion (2) » |
| 107b. 50242 - Numbers whose sum of the digits is divisible by K |
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Discussion (3) » |
| 113. 50241 - Greatest common divisor |
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Discussion (2) » |
| 127b. 50730 - The largest product |
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Choose two numbers such that whose product is maximum |
Clarifications (1) » |
| 127c. 50731 - The largest product (2) |
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Choose three numbers such that whose product is maximum |
Clarifications (1) » |
| 138. 50732 - Sorting |
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Put N numbers in increasing order |
Clarifications (2) » |
| 147. 50251 - Symmetric matrix |
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About the main diagonal |
Discussion (1) » |
| 213. 50769 - Arithmetic expression |
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Discussion (1) » |
| 217. 50253 - Timer |
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Parsing the string "hours:minutes:seconds" |
Discussion (1) » |
| 133. 50239 - Eating cheese |
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Draw the route such that the small mouse eats all the cheese |
Discussion (1) » |
| 159. 50668 - Triangle |
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Triangle with the smallest perimeter |
Discussion (1) » |
| 206. 50252 - Birthday |
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Sequence of occurrences in the game |
Discussion (1) » |
| 234. 50249 - Ladders |
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Count the number of possible ladders |
Discussion (1) » |
| 235. 50250 - The Knight |
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Dial a phone number speed-dial knight |
Discussion (1) » |
| 272. 50707 - Rebus |
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Find all solutions of the puzzle |
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| 240. 50247 - Missing numbers |
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Substitute figures that equality becomes true |
Discussion (1) » |
| 275. 50691 - The traveling salesman problem |
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Bypass all the vertices once |
Discussion (1) » |