Modify the string to alternate between upper and lower case. For example,
Additional test cases have been added.
Who knows the last digit of pi?
Angle between Two Vectors
Generate a string like abbcccddddeeeee
Magic is simple (for beginners)
Fibonacci-Sum of Squares
Find the index of n in magic(n)
union without repitition
Sum of odd numbers in a matrix
most frequent character
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