We define the distance between two array values as the number of indices between the two values. Given 
, find the minimum distance between any pair of equal elements in the array. If no such value exists, print 
.
For example, if 
, there are two matching pairs of values: 
. The indices of the 
's are 
and 
, so their distance is 
. The indices of the 
's are 
and 
, so their distance is 
.
Function Description
Complete the minimumDistances function in the editor below. It should return the minimum distance between any two matching elements.
minimumDistances has the following parameter(s):
- a: an array of integers
Input Format
The first line contains an integer 
, the size of array .
The second line contains space-separated integers 
.
Constraints
Output Format
Print a single integer denoting the minimum 
in . If no such value exists, print .
Sample Input
6
7 1 3 4 1 7
Sample Output
3
Explanation
Here, we have two options:
and 
are both 
, so 
.
and 
are both 
, so 
.
The answer is 
.