Find the peak 3n+1 sequence value
Compute a dot product of two vectors x and y
Change the sign of even index entries of the reversed vector
Fahrenheit to Celsius converter
2倍してみよう - ここからスタート！
Convert a number to its Roman representation
Find the area of the four walls
Concatenate two strings
Find the dimensions of a matrix
Find the square of the sum of the digits of a number
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