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Maximum Sum

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You are given an array(of integers) of length n.
You are required to answer q queries.

Queries can be of two types :-
Update
0 idx val : set arr[idx] to val.
Query
1 l r: find i,j such that l <= i < j <= r, such that arr[i]+arr[j] is maximized. return arr[i]+arr[j].
Input Format 
A number n
n1
n2
.. n number of elements
A number q
following q lines contains queries of format either of two 
0 idx val
1 l r
Output Format 
for each query of type 1 print a single integer in seperate line
Question Video
Constraints 
1. 1 <= n, q <= 10^5
2. 0 <= l < r < n
3. 0 <= idx < n
4. 1 <= arr[i], val <= 10^4.
Sample Input 
8
2
6
1
5
4
10
10
9
5
1 0 4
0 0 10
1 0 4
1 0 7
1 3 4
Sample Output 
11
16
20
9


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