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Problems

Math
Difficulty
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6459
Cosine
Easy
6460
Billiard
Very easy
6461
Queue
6481
Euler`s Problem
Hard
6531
Math Homework
Easy
6585
Eleven
Very easy
6599
Environment Protection
Hard
6606
Effective Infection Time
Easy
6613
Fractional Lotion
Very easy
6623
One Move from Towers of Hanoi
Very easy
6625
Light Switches
Easy
6655
Xenospeak
6746
X + R(X) = N
Hard
6775
Captain Obvious and the Rabbit-Man
Easy
6781
Clock Hands
6844
A DP Problem
6861
Supersquare
Very hard
6875
ABC for blind
6880
Works
Easy
6936
Square Free Numbers
Very easy
6941
Sum of GCD
6943
Teaching Hazard
6944
Counting Lattice Squares
6953
Unlock my safe
Very easy
6968
Holodeck Hacking
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