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Point Update In Square Root Decomposition

You are given a list of N numbers and Q queries. There are two types of queries:

1. f l r : In a line, the first character would be f, and 2 index l and r, you have to find the sum of numbers between l and r.
2. u i d : In a line, the first character would be u, and we have to change the value at index i in the original array by d.
Input Format
The first line contains N. The next line holds N numbers. Following the list is a number Q. The next Q lines each contain one of the 2 queries.
Output Format
Output the sum from l to r for type 1 query and update the value at index i for type 2 query.
Question Video
1 <= N <= 10^6
1 <= Q <= 10^5
1 <= arr[i] <= 10^9
Sample Input
1 5 3 9 -2
f 0 4
u 2 3
f 0 4
Sample Output

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