You are given an array of nn integers. You want to modify the array so that it is increasing, i.e., every element is at least as large as the previous element.
On each move, you can increase or decrease the value of any element by one. What is the minimum number of moves required?
Input
The first input line contains an integer nn: the size of the array.
Then, the second line contains nn integers x1,x2,…,xnx1,x2,…,xn: the contents of the array.
Output
Print the minimum number of moves.
Constraints

1≤n≤2⋅1051≤n≤2⋅105

1≤xi≤1091≤xi≤109
Example
Input:
53 8 5 6 5
Output:
4
Could anyone suggest an approach for this question?
Problem Link: CSES  Increasing Array II