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Problems

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Difficulty
Sort by
1339
A Day at the Races
Very easy
1345
The Optimal Team
Very easy
1348
Covering
Easy
1351
The highest digit
Very easy
1354
The number of Mersenne numbers
Very easy
1357
The number of zeros at the end of a number
1363
Rectangles and nails
Very easy
1364
Magic square
Easy
1382
Selling Cells
Medium
1384
Abstract Extract
Very easy
1386
Spy Cam
Easy
1394
Calculator
Hard
1401
Proof Generator
Very hard
1402
Shares
1410
Reservoir Dogs
Very easy
1411
The vassal of my vassal is not my vassal!
Very easy
1415
Rock of Advice
Very easy
1418
Queen
Easy
1426
Shooting Range
Very easy
1427
Calculator
1428
Students
Very easy
1429
Comparison of Numbers
Very easy
1430
Dad is strong...
Very easy
1437
The code of the lock
Very easy
1438
Upside Down Clock
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