Doubt on understanding the output

#1

https://codeforces.com/problemset/problem/1519/D

Why in this example its always reversing from the middle of one of the arrays.whtas the logic behind it???

#2

@Somasree you can reverse any subarray of array a there is no condition on its staring and ending point you just need to maximize the desired result by revesing any subarray

#3

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#4

In this problem
editoril solution -https://ide.codingblocks.com/s/585658
I didnot undertood
line no 22 and 28
please help

#5

@Somasree they are maximising the answer for reversing every segement in l to r and then you have 3 segments of your answer

  1. form 0 to l (which is not reversed) ans is pr[l]
  2. from l ro r (which is revered ) ans is stored in curr
  3. from r+1 to n (which is no reversed) so ans is pr[n]-pr[r+1]
    see the indices according to yourself as some computes prfrex sum from index 1 and some from 0 so it may vary but these are the 3 segments in which they are broking the aray into