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Problems

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Difficulty
Sort by
2936
Dima & module
Hard
2972
Biprime numbers
Very easy
2989
"WTO"
Medium
3047
Real Phobia
Very easy
3072
Regular Convex Polygon
Hard
3073
Distantland
Very hard
3098
Twin Apparent Primes!!
Very hard
3104
Consecutive Sums
Hard
3129
Doubloon Game
Hard
3132
Treasure Map
Medium
3139
Shuffling
Hard
3145
Pipe
Medium
3156
Ancient Calendar
Hard
3195
The Balance
Hard
3210
Hyper Harmonic number
Very easy
3233
k-perfect numbers
Medium
3234
Quadratic equation 1
Easy
3236
Travel
Medium
3237
The algorithm of Petya
Very easy
3239
Mertens function
Very easy
3241
The inverse problem
Easy
3243
GCD-determinant
Very easy
3245
Quadratic equation 2
Hard
3247
Fermat's Theorem
Medium
3270
Tree of Resistors
Hard
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