KGSS  Maximum Sum
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.
Query: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].
Input
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
Output the maximum sum mentioned above, in a separate line, for each Query.
Example
Input: 5 1 2 3 4 5 6 Q 2 4 Q 2 5 U 1 6 Q 1 5 U 1 7 Q 1 5 Output: 7 9 11 12
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innovolt:
20150117 11:24:15
Yes,,Got AC...learnt new DS... 

Anubhav:
20141201 16:42:23
First AC with segment tree. Really glad. 

ashish kumar:
20141125 17:29:26
my first own implementation and trick on segment tree question feeling really nice 

Sam Winchester:
20140922 16:53:58
finally did it :) 

Umair Khan:
20140905 21:22:19
Segment Tree FTW! 

abdelkarim:
20140902 17:48:50
easy 1! 

RAMSDEN:
20140729 21:44:24
nice problem:) 

Archit Jain:
20140702 10:06:55
very good question.. 

JordanBelfort:
20140626 00:13:55
njyed doin ds one 

GreyHaze:
20140201 20:44:37
Judge is not fair for java.. java users please take note.. If you use BufferedReader/Scanner, you'll have TLE... use DataInputStream... 
Added by:  Swarnaprakash 
Date:  20090110 
Time limit:  1s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: ERL JSRHINO NODEJS PERL6 VB.NET 
Resource:  Kurukshetra 09 OPC 