The COVID-19 Sequence
Practice
1 (1 votes)
Basic math
Bitwise xor
Problem
15% Success 97 Attempts 20 Points 1s Time Limit 256MB Memory 1024 KB Max Code

COVID-19 is spreading rapidly and has become a pandemic in no time. Starting from a few countries, it is expanding indefinitely.

Initially, there are K countries (numbered 0 to K-1) – with the ith country (0 < i < K) having Si COVID-19 viruses.

The no. of COVID-19 viruses in the Nth country (N > K) is given by: -
SN = SN-1 + SN-2 + SN-3 + … + SN-K

This sequence continues infinitely and we call it - “The COVID-19 Sequence”.

You need to answer Q queries. In each query, you are given an integer N. You need to find the value of SN modulo 2. Can you answer them quickly?

Input:

  • The first line of the input contains a single integer T denoting the number of test cases. The description of T test cases follows.
  • The first line contains two space-separated integers – K , Q.
  • The next line contains K space-separated integers Si .
  • The ith of the next Q lines contains a single integer N, describing the query.

Output:

For each query, print a single line containing one integer – the value of SN modulo 2.

Constraints:

  • 1 < T < 5
  • 1 < K < 1000
  • 1 < Q < 105
  • 0 < Si < 109
  • 0 < N < 10100000
  • Sum of D.Q (D = no. of digits in N) over all test cases does not exceed 106
     

Test Files:

Test File #1 (10 points):

  • K = 2
  • 0 < N < 109
  • So = 0
  • S1 = 1

Test File #2 (10 points):

  • K = 2
  • 0 < N < 109

Test File #3 (10 points):

  • K = 3
  • 0 < N < 109

Test File #4 (30 points):

  • 0 < N < 109

Test File #5 (40 points): original constraints

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