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Problems
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Difficulty
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852
Long division on a short number
Very easy
854
Amicable numbers
Easy
858
Birthday
Very easy
860
The game of "Date"
Easy
861
Matrix Summation
Very easy
866
Computer Dialogue
Very easy
879
Plumbing
Easy
881
M777 Howitzer
Easy
883
Cricket field
Hard
887
Seeds
Very easy
891
Buying Flowers
Easy
895
Falsification of results
Medium
897
Dictionary
Easy
939
The square of the sum
941
Difference
Very easy
943
Digits permutation
Very easy
945
Without the middle
949
Two digits from four digits
951
Swap the Middle
955
The square of sum
961
Four-digit without middle
962
The longest side of the quadrilateral
Very easy
963
Permutation of the words
968
Distance between numbers
Hard
990
12345
Very easy
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86