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Problems

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9989
Two-digit numbers 5
9990
Two-digit numbers 6
9991
Three-digit numbers
9992
Three-digit numbers 2
9993
Three-digit numbers 3
9994
Three-digit numbers 4
9995
Three-digit numbers 5
9997
Three-digit numbers 7
9998
Three-digit numbers 8
9999
Three-digit Armstrong numbers
10001
Sticks
Hard
10003
Almost maximum
Easy
10004
Domino
Easy
10005
Units
Very easy
10023
Number
Very easy
10024
How many words
Easy
10025
How many residents
Easy
10026
Number Partitioning
Very easy
10027
Robot on the Number Line
Very easy
10028
Characteristic
10029
Corona2020
Very easy
10030
SpaceX
Easy
10031
Skyscrapers
Medium
10032
Positive tests
Medium
10033
Fire extinguishing robot
Hard
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