you are given an array and you have to make it non-decreasing with the minimum operations.

operation:- merge(add) two adjacent elements.

testcase -:

7

5 4 4 3 11 12 13

output = 2

explanation-> 0-based indexing,

- merge index 1 element with index 2 element then array → 5 8 3 11 12 13
- again merge index 1 element with index 2 element → 5 11 11 12 13

so, two operations aare required to make the array non decreasing.