Given a and b as a string, return b-a without using string to number conversion functions. a and b must to be a same size and b > a.
a = '0125'
b = '1125'
y = 1000
The test suite is too simple.
vectorization in N
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
matrix of natural number
Concatenate two strings
Make a diamond
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