A1393 | [COCI-2020-2021-contest5]#4 Sjeckanje

Paula likes to prepare stir fry. In order to make it as yummy as possible, she needs to chop a sequence of n integers into segments of the maximum total value.
The value of a segment is the difference of its maximum and minimum. The value of a chopped sequence is the sum of the values of the segments.
For example if we chop the sequence [1 4 1 5 3 6] into segments [1 4 1] and [5 3 6], the total value is (4 − 1) + (6 − 3) = 6.
There will be q updates of the form “add x to the elements on indices l, l + 1, . . . , r”. After each update, answer the query “What is the maximum possible value of the chopped sequence?”.

The first line contains integers n and q (1 ≤ n, q ≤ 200 000), the length of the sequence and the number of updates.
The second line contains n integers ai (−10^8 ≤ x ≤ 10^8), the sequence Paula needs to chop.
Each of the following q lines contains integers l, r (1 ≤ l ≤ r ≤ n), and x (−10^8 ≤ x ≤ 10^8), describing an update.

Output q lines, the maximum possible value of the sequence after each update.