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Problems

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Difficulty
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3210
Hyper Harmonic number
Very easy
3211
Holidays
Very easy
3212
Instant messaging system
Easy
3213
Dolphins
Very easy
3214
Drafts and rabbits
Very easy
3215
Rabbit's planet
Hard
3216
Stringorial
Easy
3217
New Year
Very easy
3218
Rectangles
Easy
3219
Stockbroker Grapevine
Medium
3220
Frame Stacking
Hard
3221
Channel Allocation
Medium
3222
Alien Security
Hard
3223
Octal Fractions
Medium
3225
Euro Efficiency
Medium
3226
Markov Trains
Very hard
3227
Hansel and Grethel
Very easy
3228
Floors
Hard
3229
The Picnic
Easy
3230
Pearls
Medium
3231
Huffman Trees
Easy
3232
Input
Easy
3233
k-perfect numbers
Medium
3234
Quadratic equation 1
Easy
3235
Interesting number
Easy
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