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Im not sure of this solution. This will not be working with this input:

51213332

The output should be 2 but will be 3 because it will count last digit of the series 3. This solution does not consider what if solution will be shorter than a month digit.

Sure, this will pass all validators but still... :).

## Birthday Chocolate

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The shortest method for the above python code

return sum(1 for x in range(len(s)) if sum(s[x:x+m]) == d)

Well done!

Im not sure of this solution. This will not be working with this input:

The output should be

`2`

but will be`3`

because it will count last digit of the series`3`

. This solution does not consider what if solution will be shorter than a month digit.Sure, this will pass all validators but still... :).

return sum(1 for x in range(len(s)) if sum(s[x:x+m]) == d and len(s[x:x+m]) == m )

That't beutiful thank you for sharing : i did this way but we can make way shorter by yours..

List comprehension is amazing

I agree but also his method is n * m time complexity sadly.

a minor optimization:

return sum(1 for x in range(len(s)-m+1) if sum(s[x:x+m]) == d)