SEACO - Editorial::please provide an easy editorial

p.s-i saw the editorial provided SEACO - Editorial - editorial - CodeChef Discuss

Well, i have made use of difference array and sum array without using trees.

You can read about applying range updates in array in constant O(1) time using sum array Here

You may have a look at my approach explanation Here and My code Here

Feel free to ask anything…

Please upvote if u find this helpful…

i have explained it step by step. read it , i hope it helps.