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# Find the numbers missing

By : shah
Date : October 21 2020, 11:12 AM
I think the issue was by ths following , Since N is really small, you can use F[i] = k if number i appears k times.
code :

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## Given numbers from 1 to 2^32-1, one is missing. How to find the missing number optimally?

By : rinku.arnob
Date : March 29 2020, 07:55 AM
around this issue Major Edit: Trust me to make things much harder than they have to be.
XOR all of them.

## Easy interview question got harder: given numbers 1..100, find the missing number(s) given exactly k are missing

By : Todd Saunders
Date : March 29 2020, 07:55 AM
Remember sum of i-th powers, where i=1,2,..,k. This reduces the problem to solving the system of equations

## Find 1, 2, 3 missing numbers in an array of first N natural numbers

By : juanoboy
Date : March 29 2020, 07:55 AM
Hope this helps Find minimum and maxium number in array, create array from them using Array.from() filter that array with provided array to return missing numbers.
code :
`````` function findMissingNumbers(arr) {
var min = Math.min(...arr);
var max = Math.max(...arr);
var all = Array.from(Array(max - min + 1), (e, i) => i + min)
return all.filter(e => !arr.includes(e))
}

console.log(findMissingNumbers([1, 3, 4, 5, 6, 7]));
console.log(findMissingNumbers([10, 16, 8]));``````

## SQL Server - Find Missing Numbers in sequence where numbers contain preceding zeros

By : Gil Caraff
Date : March 29 2020, 07:55 AM
I wish did fix the issue. All you need is a sequence of number table ( there are so many implementations already in SO) and then use LEFT JOIN. See below query: seq is sequence of number form 1 to 9999 as int.
code :
``````;with seq as
(
select top 9999 row_number() over(order by t1.number) as N
from   master..spt_values t1
cross join master..spt_values t2

)

SELECT RIGHT('000'+CAST(s.n AS VARCHAR(3)),3) as MissingNumbers
from seq s
left join yourtable t on s.n = cast(t.Number as int)
where t.number is null
``````

## Find 2 missing numbers in an array of integers with two missing values

By : Marc ValRa
Date : March 29 2020, 07:55 AM
Any of those help This method is not advisable as it suffers from integer overflow problems. So use XOR method to find the two numbers, which is highly performant. If you are interested i can explain.
As per the request from @ordinary below, i am explaining the algorithm: