Quiz 2

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CS5031w- Advance Algorithms Analysis
Quiz 2
Student ID: __________
The 0-1 knapsack problem is the following. A thief robbing a store finds items.
The th item is worth dollars and weighs
pounds, where and
are
integers. The thief wants to take as valuable a load as possible, but he can carry at
most pounds in his knapsack, for some integer . Which items should he
take?
(We call this the 0-1 knapsack problem because for each item, the thief must
either take it or leave it behind; he cannot take a fractional amount of an item or
take an item more than once.)
Give a bottom-up dynamic programming solution to the 0-1 knapsack problem.
Hint:
For each item, there are two possibilities:
• We include current item in KnapSack and recurse for remaining items
with decreased capacity of Knapsack. (If the capacity becomes negative,
do not recurse or return –∞).
• We exclude current item from KnapSack and recurse for remaining
items.
Finally, we return maximum value we get by including or excluding current
item.
Page
1
The base case of the recursion would be when no items are left or capacity
becomes 0.
CS5031w- Advance Algorithms Analysis
Quiz 2
Student ID: __________
Given an × binary matrix (i.e. matrix containing 0’s and 1’s), find the size of
largest square sub-matrix of 1's present in it.
Hint:
The size of largest square sub-matrix ending at a cell [ , ] will be 1 plus
minimum among largest square sub-matrix ending at [ , − 1] ,
[ − 1, ] and [ − 1, − 1.
2
[, ]
Page
The result will be the maximum of all square sub-matrix ending at
for all possible values of and .
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