How Do You Find the Missing and Repeating Elements in an Array?

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Create a temp array temp [] of size n with all initial values as 0. Traverse temp [] and output the array element having value as 0 (This is the missing element) Traverse the array. While traversing, use the absolute value of every element as an index and make the value at this index as negative to mark it visited.

What is the value of the missing element?

So the value of the missing element is the difference between the sum of the entire sequence and the sum of the input array. The maximum value of N is 100,000, which would cause an arithmetic overflow when calculating the sum of the sequence.

How to find the value of a missing number?

So the sum of all n elements, i.e sum of numbers from 1 to n can be calculated using the formula n* (n+1)/2. Now find the sum of all the elements in the array and subtract it from the sum of first n natural numbers, it will be the value of the missing element.