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Homework

VIEWS: 2 PAGES: 3

  • pg 1
									                  Greedy Algorithms Homework

• Page 274:   2
• Page 318:   2
                       Homework, Page 274

2. Greedy coin changing with A = 37 and denominations 1,5,10,25
  i=1
  c = A/denom[i] = 37/25 = 1            Use 1 coin of denomination 25
  A = A - c*denom[i] = 37 - 1*25 = 12
  i = i+1= 2
  c = A/denom[i] = 12/10 = 1            Use 1 coin of denomination 10
  A = A - c*denom = 12 - 1*10 = 2
  i = i+1 = 3
  c = A/denom[i] = 2/5 = 0              Use 0 coins of denomination 5
   A = A - c*denom = 2 - 0*5 = 2
  i = i+1= 4
   c = A/denom[i] = 2/1 = 2             Use 2 coins of denomination 1
                              Homework: Page 318
2 Solve the following continuous-knapsack problem


                 i       1      2      3     4
                pi       4      3      6     8
                wi      12     15     20     15                   Capacity = 50
               pi/wi    1/3    1/5   3/10   8/15




Object indices in descending price/weight ration: 4,1, 3, 2
Choices:
  all of 4, all of 1, all of 3, for a total weight of 15+12+20 = 47;
  plus (3/15) of 2, for a total weight of 47 + (1/5)15 = 50
Profit: 18 + 16 + 14 + (1/5)4 = 18.4

								
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