KGSS - Maximum Sum

You are given a sequence A[1], A[2], ..., A[N] ( 0 ≤ A[i] ≤ 10^8 , 2 ≤ N ≤ 10^5 ). There are two types of operations and they are defined as follows:


This will be indicated in the input by a 'U' followed by space and then two integers i and x.

U i x, 1 ≤ i ≤ N, and x, 0 ≤ x ≤ 10^8.

This operation sets the value of A[i] to x.


This will be indicated in the input by a 'Q' followed by a single space and then two integers i and j.

Q x y, 1 ≤ x < y ≤ N.

You must find i and j such that x ≤ i, j ≤ y and i != j, such that the sum A[i]+A[j] is maximized. Print the sum A[i]+A[j].


The first line of input consists of an integer N representing the length of the sequence. Next line consists of N space separated integers A[i]. Next line contains an integer Q, Q ≤ 10^5, representing the number of operations. Next Q lines contain the operations.


Output the maximum sum mentioned above, in a separate line, for each Query.


1 2 3 4 5
Q 2 4
Q 2 5
U 1 6
Q 1 5
U 1 7
Q 1 5


Warning: large Input/Output data, be careful with certain languages

hide comments
ramini1996: 2018-02-02 20:45:41

My 50th !!! AC in ONE GO !!!

kushagra__k: 2018-01-01 22:55:23

There can be 2 approaches here:
1> Use a structure array for the max and second max
2> A modification of the Range Maximum Query.

After getting AC on 1st one, go for the second one. :)

vijayrit: 2017-12-20 00:36:46

Please do take sufficienty large array for the tree. Costed me four SIGSEGV errors.

rishabhm123: 2017-12-17 18:54:04

AC in one go..Simple Segment tree with a slight variation of range min

the_phoenixx: 2017-12-15 16:30:41

Simple segment tree implementation!!

grylls: 2017-11-11 08:53:54

Nice Question...AC in one GO:)

ramprosad: 2017-10-30 06:40:43

Input limit 10^8 , but for integer data type verdict is runtime error ??? What's amaging!!!!!

vicky_1998: 2017-10-29 06:29:18

Was an easy one, added experience with segment tree though

da_201501181: 2017-09-14 11:52:22

AC in ONE GO..!!! Nice implementation category question

VENUKANT SAHU: 2017-09-12 13:28:16

AC in one go :)

Added by:Swarnaprakash
Time limit:0.357s-0.857s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: ERL JS-RHINO NODEJS PERL6 VB.NET
Resource:Kurukshetra 09 OPC