Welcome to ZOJ Problem Sets Information Select Problem Runs Ranklist ZOJ Problem Set - 3813
Alternating Sum

Time Limit: 2 Seconds      Memory Limit: 65536 KB

There is a digit string S with infinite length. In addition, S is periodic and it can be formed by concatenating infinite repetitions of a base string P. For example, if P = 3423537, then S = 3423537342353734235373423537...

Let's define the alternating sum on substrings of S. Assume Sl..r is a substring of S from index l to index r (all indexes are 1-based), then the alternating sum of Sl..r is:

G(l, r) = Sl - Sl+1 + Sl+2 - ... + (-1)r-lSr

For example, S2..10 = 423537342, then G(2, 10) = 4 - 2 + 3 - 5 + 3 - 7 + 3 - 4 + 2 = -3.

Now, you are given the base string P and you have to do many operations. There are only two kinds of operations:

• 1 x d: set Px to d, d is a single digit.
• 2 l r: find the sum of G(i, j) that l <= i <= j <= r.

For each second operation, you should output the sum modulo 109 + 7.

#### Input

There are multiple test cases. The first line of input contains an integer T indicating the number of test cases. For each test case:

The first line contains a digit string P (1 <= length(P) <= 100000).

The second line contains an integer Q (1 <= Q <= 100000) indicating the number of operations. Each of the following Q lines is an operation in such format:

• 1 x d (1 <= x <= length(P), 0 <= d <= 9)
• 2 l r (1 <= l <= r <= 1018)

#### Output

For each "2 l r" operation, output an integer, indicating the sum modulo 109 + 7.

```2
324242
4
2 1 1
2 1 4
1 3 7
2 3 4
324242
6
2 1 1
1 3 7
2 2 4
1 3 4
2 7 10
2 1 30
```

#### Sample Output

```3
20
14
3
8
20
870
```

Author: LIN, Xi
Source: The 2014 ACM-ICPC Asia Mudanjiang Regional First Round
Submit    Status