Masala #GBQ6AU7GPS

Given an array of n integers, your task is to process q queries of the following types:

1. update the value at position k to u
2. what is the sum of values in range [a,b]?

• The first input line has two integers n and q: the number of values and queries.
• The second line has n integers x[1], x[2]​, …, x[n]​: the array values.
• Finally, there are qqq lines describing the queries. Each line has three integers: either "1 k u" or "2 a b".

1 ≤ n, q ≤ 2⋅10^5

1 ≤ x[i], u ≤ 10^9

1 ≤ k ≤ n

1 ≤ a ≤ b ≤ n

Print the result of each query of type 2.