Daily Challenge #33

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#1

Create a procedure that takes an array of numbers between 1 and 10 (excluding one number) and returns the missing number.

Examples

missingNum([1, 2, 3, 4, 6, 7, 8, 9, 10]) ➞ 5

missingNum([7, 2, 3, 6, 5, 9, 1, 4, 8]) ➞ 10

missingNum([10, 5, 1, 2, 4, 6, 8, 3, 9]) ➞ 7

Notes

  • The array of numbers will be unsorted (not in order).
  • Only one number will be missing.
6 Likes
#2

I get it to work like this:

  1. Get the sum of numbers which is total = n*(n+1)/2
  2. Subtract all the numbers from sum and you will get the missing number

blocks%20(1)
blocks%20(1)1511×533 50.5 KB

Pretty rough work though (Your suggestions will be really helpful to me)…

Here is demo APK and AIA:
MissingNumber.apk (4.8 MB)
MissingNumber.aia (2.8 KB)

Edit 1: Thanks @Peter for the hint :wink: (Reduced blocks from 40 to 33) Even now looks neat.

3 Likes
#3

Do you know where the little blue gear is for in the add block? You should try that in your procedure.

2 Likes
#4

This is my version
image

Input is a string like 1,2,3,4,5,6,8,9,10 result is 7.

6 Likes
#5

or this:

grafik
grafik.png631×535 35 KB

missingNumber.aia (9.2 KB)

5 Likes
#6