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CSES Problem Set

Range Sum Queries II


Task | Statistics


CSES - Range Sum Queries IICSES - Range Sum Queries II

Time limit:1.00 s Memory limit:512 MB

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 $[a,b]$?
Input

The first input line has two integers $n$ and $q$: the number of values and queries.

The second line has $n$ integers $x_1,x_2,\dots,x_n$: the array values.

Finally, there are $q$ lines describing the queries. Each line has three integers: either "$1$ $k$ $x$" or "$2$ $a$ $b$".

Output

Print the result of each query of type 2.

Constraints
Example

Input:
8 4
3 2 4 5 1 1 5 3
2 1 4
2 5 6
1 3 1
2 1 4


Output:
14
2
11