check the B_correst for test case 3
Which doors are open?
Who knows the last digit of pi?
Rotate input square matrix 90 degrees CCW without rot90
Split a string into chunks of specified length
Doubling elements in a vector (★★)
Create a vector of the first n natural numbers (★)
Variance computation (★★★)
Longest run of consecutive numbers (★★★★★)
Create a vector of the first n odd numbers (★)
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