Question

my life is over
You found a number in base-10 written on your computer screen You want to delete many digits by repeatedly choosing any two consecutive digits and deleting them
The remaining als squish overcome together like they would in an actual editor. But you only love 17. So the sum of those 2 chosen digits must be 17
Example 389099 > Delete middle first 89 to get 3899 -> Delete middle 89 to get 39 So final length remaining number's length is 2
Given an initial number containing many digits, determine the final length of the remaining number assuming you delete as many digits as possible
Note The number has no digits equal to init
Function Description
Complete the loveSeventeen function in the editor below. It has the following parameters
Name
Type
Description
Parameters
S
STRING
number
Return
The function must return an NTEGER denoting the the final length of the number
Constraints
• 1 slens) 100
Input Format For Custom Testing
The best ne contains a string Sderot ng the number

Answer 1

Answer:   python code

def bino($n, k$):

 if not $0$<=$k$<=$n$: return 0

 $b=1$

 for t in range(min($k, n-k$)):

  $b*=n$; $b//=t+1; n-=1$

 return b

def f(n):

 bad = 0

 

 for k in range($(n - 2) // 2 + 1$):

  $bad += 9**k$ * bino($n, k)$

 

 return ($10**n - 2$ * bad) % ($10**9 + 7$)

 

print(f($389099$))

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