Q. 15 The subset-sum problem is defined as follows. Given a set of n positive integers, S = {a1 ,a2 ,a3 ,…,an} and positive integer W, is there a subset of S whose elements sum to W? A dynamic program for solving this problem uses a 2-dimensional Boolean array X, with n rows and W+1 columns. X[i, j],1 <= i <= n, 0 <= j <= W, is TRUE if and only if there is a subset of {a1 ,a2 ,…,ai} whose elements sum to j. Which of the following is valid for 2 <= i <= n and ai <= j <= W?
Which entry of the array X, if TRUE, implies that there is a subset whose
elements sum to W?
(A) X[1,W]
(B) X[n,0]
(C) X[n,W]
(D) X[n – 1,n]
Answer: (C)
Explanation:
