# Problem: PermMissingElem

P

An array A consisting of N different integers is given. The array contains integers in the range [1..(N + 1)], which means that exactly one element is missing.

Your goal is to find that missing element.

Write a function:

int solution(int A[], int N);

that, given an array A, returns the value of the missing element.

For example, given array A such that: A[0] = 2 A[1] = 3 A[2] = 1 A[3] = 5

the function should return 4, as it is the missing element.

Write an efficient algorithm for the following assumptions:

• N is an integer within the range [0..100,000];
• the elements of A are all distinct;
• each element of array A is an integer within the range [1..(N + 1)].
``````int solution(int A[], int N)
{
int fV = 0,cV=0;
for(int i=1;i<=N+1;i++)
fV+=i;
for(int i=0;i<N;i++)
cV +=A[i];
return fV-cV;
}``````
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