17665번 - Triple Jump 서브태스크다국어

There is a very long straight road, which consists of N sections numbered from 1 through N. Each section has specific firmness, and the firmness of the section i (1 ≤ i ≤ N) is A_i.

JOI-kun, the gifted sport star, is going to play triple jump. A triple jump consists of three consecutive jumps. Let a, b, c be the numbers of sections at which JOI-kun takes off, then the following conditions should be met.

• a < b < c. Namely, the numbers of the sections should be increasing.
• b − a ≤ c − b. Namely, the jumping distance of the first jump should be less than or equal to the jumping distance of the second jump.

JOI-kun is going to perform Q triple jumps. In the j-th (1 ≤ j ≤ Q) triple jump, he should take off at sections whose numbers are in the range of L_j to R_j. In other words, L_j ≤ a < b < c ≤ R_j must be hold.

JOI-kun wants to take off at firmer sections. For each triple jump, JOI-kun is curious to know the maximum sum of firmness of the sections at which JOI-kun takes off.

Write a program that, given the number of sections and the information of triple jumps, calculates for each triple jump the maximum sum of firmness of the sections at which JOI-kun takes off.

Read the following data from the standard input. All the values in the input are integers.

N
A1 A2 · · · AN
Q
L1 R1
L2 R2
. . .
LQ RQ

Write Q lines to the standard output. The j-th (1 ≤ j ≤ Q) line should contain the maximum sum of firmness of the sections at which JOI-kun takes off in the j-th triple jump.

• 3 ≤ N ≤ 500 000.
• 1 ≤ A_i ≤ 100 000 000 (1 ≤ i ≤ N).
• 1 ≤ Q ≤ 500 000.
• 1 ≤ L_j < L_j + 2 ≤ R_j ≤ N (1 ≤ j ≤ Q).