GSS1 - Can you answer these queries I


You are given a sequence A[1], A[2] ... A[N] . ( |A[i]| ≤ 15007 , 1 ≤ N ≤ 50000 ). A query is defined as follows:
Query(x, y) = Max { a[i] + a[i+1] + ... + a[j] ; x ≤ i ≤ j ≤ y }.
Given M queries, your program must output the results of these queries.

Input

  • The first line of the input file contains the integer N.
  • In the second line, N numbers follow.
  • The third line contains the integer M.
  • M lines follow, where line i contains 2 numbers xi and yi.

Output

Your program should output the results of the M queries, one query per line.

Example

Input:
3 
-1 2 3
1
1 2

Output:
2

hide comments
aryan__0406: 2020-04-09 19:34:19

@randomtree you have written wrong code that's why you are getting wrong answer.
Also using brute force approach will give time limit exceeded. Learn segment tree for this.

randomtree: 2020-04-04 23:20:14

I'm using brute force and getting WA. Any suggestions?

aryan__0406: 2020-03-26 16:21:18

A good problem on segment trees.A must solve problem.

Last edit: 2020-04-09 19:32:43
rajgothi: 2020-03-26 11:42:24

misunderstanding kill my 2 hours!

aryan__0406: 2020-03-26 10:43:26

@noob_2798 we have to find the maximum subsequence so it is necessary for them to be contiguous.
Hope it helps.

noob_2798: 2020-03-24 19:57:56

Is it necessary for the elements to be contiguous?

heartless_2811: 2020-03-23 14:31:49

help me debugging this code !! I think it's failing on test case 9 https://ideone.com/5Efoaw

shanto09: 2020-03-23 08:43:26

A problem worth solving!

vritta: 2020-03-22 11:14:34

For the newbies you can see explanation on my blog(read the comments for explanation), copy the code on your IDE & remove unnecessary comments it will become short- <snip>

Last edit: 2022-08-17 17:30:35
herrdirektor: 2020-03-17 17:00:18

solved after many attempts. Total satisfaction after solving this one


Added by:Nguyen Dinh Tu
Date:2006-11-01
Time limit:1s
Source limit:5000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: ERL JS-RHINO NODEJS PERL6 VB.NET