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Problems

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Difficulty
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1572
Coupons
Medium
1573
Cows and Cars
Easy
1576
The Lost Gift
Medium
1577
So you want to be a 2^n-aire?
Hard
1583
Shooting gallery
Easy
1585
Lottery Game
Medium
1598
Food Collecting
Very easy
1610
Rabbits in the cells
Very easy
1613
Two numbers and the four actions
Easy
1625
Judging Olympia
Easy
1642
Hometask
Easy
1673
Sim-sim
Medium
1684
Mobile tariff "Cents"
Very easy
1686
Fire
Very easy
1690
Test Work
Very easy
1702
A Greener World
Hard
1753
Lowest Bit
Easy
1772
Vasya and the Cube
Medium
1780
Gray Codes
Very easy
1782
The sum of divisors
Easy
1785
Patterns
Easy
1789
Order of a permutation
Medium
1798
Graphic file
Very easy
1802
Ropes
Easy
1810
Judges' Time Calculation
Medium
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