Given numbers from 1 to 2^321, 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
I wish this help you Here's a summary of Dimitris Andreou's link. Remember sum of ith 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:

