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Burst Balloons

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1. You are given an array(arr) of length N which represents N number of balloons.
2. Each balloon is painted with a number on it.
3. You have to collect maximum coins by bursting all the balloons.
4. If you burst a balloon with index i, you will get (arr[i-1] * arr[i] * arr[i+1]) number of coins.
5. If arr[i-1] and arr[i+1] don't exist, then you may assume their value as 1.
Input Format 
A number N
a1
a2.. N integers
Output Format 
Check the sample output and question video.
Question Video
Constraints 
1 <= N <= 1000
1 <= arr[i] <= 100
Sample Input 
3
1
2
3
Sample Output 
12


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