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Problems

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Difficulty
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9971
Sum 2
Very easy
9972
Sum 3
Easy
9973
Sum 4
Very easy
9974
Sum 5
Very easy
9975
Sum 6
Very easy
9976
Sum 7
Very easy
9977
Sum 8
Very easy
9978
Sum 9
Very easy
10025
How many residents
Easy
10032
Positive tests
Medium
10055
How many balanced ternary
Easy
10100
Pythagoras's Revenge
Easy
10145
Increasing sines
Very easy
10165
Function f(n)
Very easy
10168
Sum of inverse squares
Medium
10170
A * B + C
Very easy
10174
Maximize the Ratio
Very easy
10201
Binary Matrix
Hard
10214
Rats
Very easy
10226
Social networks
Very easy
10230
Photo Scaling
Medium
10250
Trio
Very easy
10253
Nastya and Decryption
Very easy
10258
Cossack Vus and the Treasures
Very easy
10266
Elves' Competition
Easy
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