#P5072. Subsequence Sum Query
Subsequence Sum Query
Subsequence Sum Query
You are given a sequence of integers. For each query, you need to compute the sum (modulo \(p\)) of all distinct sums generated by the subsequences of a subarray defined by the interval \([l,r]\). Here, a subsequence is obtained by deleting zero or more elements without changing the order of the remaining elements (the empty subsequence is also considered).
More formally, for an interval \([l,r]\), let \(S\) be the set of all sums of subsequences of \(a_l,a_{l+1},\ldots,a_r\). Your task is to output \(\left(\sum_{x\in S} x\right) \bmod p\).
inputFormat
The first line contains three integers \(n\), \(q\), and \(p\) \((1\le n,q\le 20,\ 1\le p\le 10^9)\), representing the number of elements in the sequence, the number of queries, and the modulo value, respectively.
The second line contains \(n\) space-separated integers \(a_1,a_2,\ldots,a_n\) that make up the sequence.
Each of the following \(q\) lines contains two integers \(l\) and \(r\) \((1\le l\le r\le n)\) representing a query interval.
outputFormat
For each query, output one line containing the result: the sum of all distinct subsequence sums modulo \(p\).
sample
3 2 100
1 2 3
1 2
2 3
6
10
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