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Problems

Strings
Difficulty
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3651
Bitwise modulo 3
Very easy
3654
Without reciprocity
Very easy
3671
Checking for a Subsequence
Very hard
3815
Line analysis
Medium
3911
Lunch for a Python
Easy
3949
Key to Magica`s diary
Medium
3953
License plates
Very easy
4032
Key Insight
4098
Prime Substring
4122
Periodic, My Dear Watson
Easy
4129
Who wants to live forever?
Medium
4132
Word equations
Very easy
4164
Suffix automaton
Medium
4172
Pattern matching
4217
Names
Very easy
4272
Road Series
Easy
4290
Repair
Medium
4300
Ancient Scrolls
4304
Communication with the organizers
Very hard
4338
Ritual Wall
4366
Game with palindroms
Very easy
4414
Ragged Right
4460
Egyptian Birthdays
Easy
4521
Wikipedia
Easy
4524
Improve RLE
Easy
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