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Parts of the problem description were taken from http://en.wikipedia.org/wiki/Hamming_distance.

The Hamming distance between two strings of *equal length* is the number of positions at which the corresponding symbols are different. In other words, it is the number of substitutions required to transform one string into another. Given two strings of equal length, compute the Hamming distance.

**Example**

If

s1 = 'cats' s2 = 'dogs'

then

d = 3

because three substitutions are required to transform s1 into s2.

cats => dats (substitute 'd' for 'c') dats => dots (substitute 'o' for 'a') dots => dogs (substitute 'g' for 't')

46 correct solutions
9 incorrect solutions

Last solution submitted on Jan 25, 2015