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.
Getting the absolute index from a matrix
Return the first and last character of a string
Simple date to serial no. conversion
Compare two input matrices
Make a diamond
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