No.803 Very Limited Xor Subset
タグ : / 解いたユーザー数 73
作問者 :
tempura_pp
/ テスター :
heno239
Problem Statement
heno has an integer sequence $A_1,\ A_2,\cdots ,\ A_N$ of length $N$ and an integer $X$.
heno was thinking about the following problem.
"Choose 0 or more integers from $A_1,\ A_2,\cdots ,A_N$ and compute the bitwise XOR of all the chosen integers.
How many ways are there to choose the integers so that the result is $X$?"
Since heno loves XOR, this problem was a little too easy for him. So he decided to add $M$ more conditions, each expressed in one of the following forms.
- $0\ l\ r\ $: The number of integers chosen from $A_l,\ A_{l+1},\cdots ,\ A_r$ is even (it may be 0).
- $1\ l\ r\ $: The number of integers chosen from $A_l,\ A_{l+1},\cdots ,\ A_r$ is odd.
Input
$N\ M\ X$ $A_1 A_2 \cdots A_N$ $type_1\ l_1\ r_1$ $type_2\ l_2\ r_2$ $\vdots$ $type_M\ l_M\ r_M$
- $1\le N \le 300$
- $0\le M \le min(300,\frac{N(N+1)}{2})$
- $0\le X,\ A_i \le 10^9$
- $type_i\ =\ 0,\ 1$
- $1 \le l_i \le r_i\le N$
- If $i \neq j$, then $(l_i,\ r_i)\neq (l_j,\ r_j)$
- All input values are integers
Output
Print on one line the number of ways to choose integers satisfying the conditions, modulo $10^9+7$.
Sample
Sample 1
Input
4 2 3 1 1 2 2 0 2 3 0 1 4
Output
2
The 2 choices satisfying all the conditions are $\{a_1,\ a_4\},\ \{a_2,\ a_3\}$.
Sample 2
Input
4 1 3 1 1 2 2 1 1 4
Output
0
It is impossible to choose an odd number of integers from the whole sequence and also make the XOR equal to 3.
Sample 3
Input
7 3 2 1 2 3 4 5 6 7 0 2 4 0 5 6 1 2 6
Output
0
Sample 4
Input
15 5 12582921 12582923 10485775 5242888 9437185 3145743 10485768 13631489 2097158 11534339 15 14680065 6291461 7340039 10485764 7340035 1 4 11 0 5 6 0 13 15 0 1 10 0 8 11
Output
8
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