HDU 5464Clarke and problem(DP)
Clarke and problem
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)
Total Submission(s): 289 Accepted Submission(s): 131
Problem Description Clarke is a patient with multiple personality disorder. One day, Clarke turned into a student and read a book.
Suddenly, a difficult problem appears:
You are given a sequence of number
a1,a2,...,an and a number
p. Count the number of the way to choose some of number(choose none of them is also a solution) from the sequence that sum of the numbers is a multiple of
p(
0 is also count as a multiple of
p). Since the answer is very large, you only need to output the answer modulo
109+7
Input The first line contains one integer
T(1≤T≤10) - the number of test cases.
T test cases follow.
The first line contains two positive integers
n,p(1≤n,p≤1000)
The second line contains
n integers
a1,a2,...an(|ai|≤109).
Output For each testcase print a integer, the answer.
Sample Input
1
2 3
1 2
Sample Output
2
Hint:
2 choice: choose none and choose all.
簡單DP題 求n個數中 m個數的和是p的倍數 m~(0-n)
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