GSS2 - Can you answer these queries II

Being a completist and a simplist, kid Yang Zhe cannot solve but get Wrong Answer from most of the OI problems. And he refuse to write two program of same kind at all. So he always failes in contests.

When having a contest, Yang Zhe looks at the score of every problems first. For the problems of the same score, Yang Zhe will do only one of them. If he's lucky enough, he can get all the scores wanted.

Amber is going to hold a contest in SPOJ. She has made a list of N candidate problems, which fit Yang Zhe very well. So Yang Zhe can solve any problem he want. Amber lined up the problems, began to select. She will select a subsequence of the list as the final problems. Being A girl of great compassion, she'd like to select such a subsequence (can be empty) that Yang Zhe will get the maximal score over all the possible subsequences.

Amber found the subsequence easily after a few minutes. To make things harder, Amber decided that, Yang Zhe can take this contest only if Yang Zhe can answer her Q questions. The question is: if the final problems are limited to be a subsequence of list[X..Y] (1 <= X <= Y <= N), what's the maximal possible score Yang Zhe can get?

As we know, Yang Zhe is a bit idiot (so why did he solve the problem with a negative score?), he got Wrong Answer again... Tell him the correct answer!


  • Line 1: integer N (1 <= N <= 100000);
  • Line 2: N integers denoting the score of each problem, each of them is a integer in range [-100000, 100000];
  • Line 3: integer Q (1 <= Q <= 100000);
  • Line 3+i (1 <= i <= Q): two integers X and Y denoting the ith question.


  • Line i: a single integer, the answer to the ith question.


4 -2 -2 3 -1 -4 2 2 -6
1 2
1 5
4 9


Warning: large input/output data,be careful with certain languages

hide comments
Karol KonaszyƱski: 2013-01-25 14:51:16

The statement is horrible. Clarification:
Yang's score of a sequence is sum of all elements, where elements of same value count once. For each interval, find a connected subsequence (maybe empty) within this interval with highest Yang's score.

Raghavendran Ramachandran: 2012-10-09 04:41:21

-2 -2 -2
1 3
Is the answer 0 or -2?

Yang Zhe: 2012-09-21 06:07:22

@Walrus, yes you are right. What Amber choose is a substring from position I to position J. She can't jump over negative score between I and J.

1,729.000: 2012-06-22 14:03:56

I cannot understand the author at all... can anyone explain it for me?

For the sample IO, if Amber only selected the problems with positive scores, wouldn't Yang Zhe get higher scores?

Last edit: 2012-06-22 23:39:17
Dongdong.Chen: 2012-05-30 08:19:51

Will Yang Zhe do two problems with the same score if there is another problem between them ? What is the answer of this:

4 -2 3 -2
1 4

Varun Nitish: 2012-03-08 08:57:20

can somebody please explain the sample outputs? i couldn't understand how the numbers were calculated...

Bill: 2011-07-22 03:03:21

Since that the statement says "For the problems of the same score, Yang Zhe will do only one of them", then no matter how many problems are between two problems of the same score, only one could be counted. Then the answer to your data would be: 3.

Nic Roets: 2011-05-31 22:50:05

Will Yang Zhe do two problems with the same score if there is another problem between them ? What is the answer of this:

1 2 1
1 3

(Note that 'fails' is spelt incorrectly).

Last edit: 2011-05-31 22:50:34
Walrus: 2011-02-22 14:22:29

I think that the author means that amber can choose a substring and not subsequence. This is the only way the sample IO can be explained. Please tell me if i am wrong.

Last edit: 2011-02-22 14:34:16

Added by:Fudan University Problem Setters
Time limit:1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: C99 ERL JS-RHINO
Resource:Description, standard program and test data by Yang Zhe