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Problems
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Difficulty
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693
Minimum in the Stack
Very easy
853
Sereja and Array
Very easy
1586
The postfix record
Easy
2455
Selling Land
Hard
2589
Cleaning the Dishes
Easy
3013
Magic Parenthesis
Medium
3042
Convex Hull (Queries)
Hard
3135
XML
Medium
3837
Expressions
Hard
4033
Tram
Very easy
4259
Minimum in the stack
Very easy
4295
Stack Maze
Very hard
4433
Verification of Valid Bracket Sequence
Very easy
4434
Cipher
Very easy
4513
Sorting of Railcars - B
Medium
5060
Reverse Polish notation
Very easy
5087
Implement a stack
Very easy
5137
Monobilliards
Very easy
6015
Solitaire
Medium
6122
Simple Stack
Very easy
6123
Stack with error protection
Very easy
6208
Even Up Solitaire
Easy
7314
Longest Valid Parentheses
Easy
8546
Find the sum
Easy
8564
Tower
Very easy
1
2
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