3420: Summer Homework
Description
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 a1,a2,...,an. Your task is to perform on it m consecutive operations of the following type:
- For given numbers xi and vi assign value vi to element axi.
- For given numbers li and ri you've got to calculate sum
, where f0=f1=1 and at i≥2: fi=fi-1+fi-2. - For a group of three numbers li ri di you should increase value ax by di for all x (li≤x≤ri).
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≤2·105) − the number of integers in the sequence and the number of operations, correspondingly. The second line contains n integers a1,a2,...,an (0≤ai≤105). Then follow m lines, each describes an operation. Each line starts with an integer ti (1≤ti≤3) − the operation type:
- if ti=1, then next follow two integers xi vi (1≤xi≤n,0≤vi≤105);
- if ti=2, then next follow two integers li ri (1≤li≤ri≤n);
- if ti=3, then next follow three integers li ri di (1≤li≤ri≤n,0≤di≤105).
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 (109).
5 5
1 3 1 2 4
2 1 4
2 1 5
2 2 4
1 3 10
2 1 5
12
32
8
50
5 4
1 3 1 2 4
3 1 4 1
2 2 4
1 2 10
2 1 5
12
45