A8985 | Summer Homework

By the age of three Smart Beaver mastered all arithmetic operations and got this summer homework from the amazed teacher:

You are given a sequence of integers $a_{1},a_{2},...,a_{n}$ . Your task is to perform on it $m$ consecutive operations of the following type:

1. For given numbers $x_{i}$ and $v_{i}$ assign value $v_{i}$ to element $a_{xi}$ .
2. For given numbers $l_{i}$ and $r_{i}$ you've got to calculate sum , where $f_{0}=f_{1}=1$ and at $i>=2$ : $f_{i}=f_{i-1}+f_{i-2}$ .
3. For a group of three numbers $l_{i}$ $r_{i}$ $d_{i}$ you should increase value $a_{x}$ by $d_{i}$ for all $x$ $(l_{i}<=x<=r_{i})$ .

Smart Beaver planned a tour around great Canadian lakes, so he asked you to help him solve the given problem.

The first line contains two integers $n$ and $m$ ( $1<=n,m<=2·10^{5}$ ) — the number of integers in the sequence and the number of operations, correspondingly. The second line contains $n$ integers $a_{1},a_{2},...,a_{n}$ ( $0<=a_{i}<=10^{5}$ ). Then follow $m$ lines, each describes an operation. Each line starts with an integer $t_{i}$ ( $1<=t_{i}<=3$ ) — the operation type:

- if $t_{i}=1$ , then next follow two integers $x_{i}$ $v_{i}$ ( $1<=x_{i}<=n,0<=v_{i}<=10^{5}$ );
- if $t_{i}=2$ , then next follow two integers $l_{i}$ $r_{i}$ ( $1<=l_{i}<=r_{i}<=n$ );
- if $t_{i}=3$ , then next follow three integers $l_{i}$ $r_{i}$ $d_{i}$ ( $1<=l_{i}<=r_{i}<=n,0<=d_{i}<=10^{5}$ ).

The input limits for scoring $30$ points are (subproblem E1):

- It is guaranteed that $n$ does not exceed $100$ , $m$ does not exceed $10000$ and there will be no queries of the $3$ -rd type.

The input limits for scoring $70$ points are (subproblems E1+E2):

- It is guaranteed that there will be queries of the $1$ -st and $2$ -nd type only.

The input limits for scoring $100$ points are (subproblems E1+E2+E3):

- No extra limitations.

For each query print the calculated sum modulo $1000000000$ $(10^{9})$ .