Check if a matrix is a palindrome both vertically and horizontally.
You function will return true for [1,2,1] or [2,7,2; 6,9,6; 2,7,2] . But it should return false for [1,2,3] or [2,7,2; 6,9,6; 3,5,3] .
Rotate input square matrix 90 degrees CCW without rot90
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Multiples of a Number in a Given Range
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Spot the First Occurrence of 5
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