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Discussion 6
1. You are to compute the total number of ways to make a change for a given amount m. Assume that we have an unlimited supply of coins and all denominations are sorted in ascending order:1 = d1 < d2 < ... < dn . Formulate the solution to this problem as a dynamic programming problem. 2. Graduate students get a lot of free food at various events. Suppose you have a schedule of the next n days marked with those days when you get a free dinner, and those days on which you must acquire dinner on your own. On any given day you can buy dinner at the cafeteria for $3. Alternatively, you can purchase one week's groceries for $10, which will provide dinner for each day that week (that day and the six that follow). However, because you don't have a fridge, the groceries will go bad after seven days (including the day of purchase) and any leftovers must be discarded. Due to your very busy schedule, these are your only two options for dinner each night. Your goal is to eat dinner every night while minimizing the money you spend on food. 3. You are in Downtown of a city and all the streets are one-way streets. You can only go east (right) on the east-west (left-right) streets, and you can only go south (down) on the north-south (up-down) streets. This is called a Manhattan walk. a) In Figure A below, how many unique ways are there to go from the intersection marked S (coordinate (0,0)) to the intersection marked E (coordinate (n,m))? Formulate the solution to this problem as a dynamic programming problem. Please make sure that you include all the boundary conditions and clearly define your notations you use. b) Repeat this process with Figure B; be wary of dead ends. T.tt oMpintiimmil opaiz otherwise Min OPE fi 11 13 t.E.oPTCiI I 1 costfordinnerfor I days if freefodondaye andfor F in FF I 2 iT 6 77 8 0345 Tn G i gogroceryshopping a day id O opteij OPTCi.jh initialzirowE for goin i vis G.z oil O too ofwaystogofromCiriIto Eoff OPTCii.gr toPTCisj takes 0cm colQ to iz 9s I fo n tom E coal 0 2 wc x 3,2 b Rec Fig formula if i _z z then OPTED D otherwise use j OPTCHE elseifi 3Ijaz x x 3,27 0