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Problems
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Difficulty
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413
Euclidean Algorithm
Medium
414
Equation
Medium
423
Award
Very easy
424
Rectangles
Very easy
438
XML-converter
Hard
441
The most round number
Very easy
444
Battleships
Easy
447
Many number
Hard
450
Spiral
Easy
451
base64
Very hard
453
Restaurants
Hard
454
Changeling
Very hard
458
Black-and-white Graphics
Very easy
462
Keyboard
Very easy
463
Incorrect addition
Very easy
464
Numbers
Very easy
473
Height
Very easy
475
Cipher
Very easy
479
Cross-stitch Embroidery
Very easy
480
Exponentiation - 2
Very easy
481
Repeat: how many times to repeat?
Hard
488
Bypass matrix with "snake"
489
Bermuda Triangle
Easy
490
Coding
496
Permutation
Very easy
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