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# OCR (Non MEI) D2 Wednesday 25th May 2016 Watch

1. (Original post by marioman)
Did anyone on here manage to augment the flow the second time?
No I'm hopeful it was a mistake

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2. Yeah I have a feeling it was a misprint and I think they wanted us to put 9 through it
3. What did you guys get for the minimax question at the very end?

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4. (Original post by drandy76)
What did you guys get for the minimax question at the very end?

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Was this the absolute difference? I got a value of 1 lmao.. wbu?
5. (Original post by AstroNandos)
Was this the absolute difference? I got a value of 1 lmao.. wbu?
Oh ffs I added them together and got 10 **** my life

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6. (Original post by drandy76)
Oh ffs I added them together and got 10 **** my life

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Well i have no idea if i did it right. You can still always get method marks for doing what you did right cant you?
7. (Original post by drandy76)
Oh ffs I added them together and got 10 **** my life

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Omg 😂😂
8. Xsanda’s solutions:

1) Matching
i) JF=3-ND=4
1:MA
2:-
3:JF
4:ND
5:JA
6:MJ
ii) SO=5-JA=2
1:MA 2:JA 3:JF 4:ND 5: SO 6:MJ
iii) 3=JF,4=ND,5=SO always
1:MJ 2:MA 3:JF 4:ND 5: SO 6:JA

2) Flow
i) FT = 2, DT = 4, cut = 9
iia) SCBFT +2 (given)
b) SCFBAEDT +1
iii) 8, with cut {SABCF}{DET} of value 8

3) Hungarian
i) Add dummy column X with 100 in each
Reduce rows -86, -92, -88, -98
Reduce cols -0,-2,-0,-2
ii) AS, BT, CL, no match for D, £271 cost
iii) CS, BT; AL costs £83

4) Rock paper scissors
i) scissors with paper: gain of 1, loss of 2: 1 + (-2) ≠ 0
ii) playsafe: scissors
iii) scissors 2-2p-4q, paper 3p+2q-2, rock 2q-p
iv) p=0.5, q=0.25, rock = 0.25

5) critical path analysis
i) F and H also critical
ii) A: -, B: -, C: -, D: A, E: BD, F: BCD, G: E, H: EF, I: GH, J: H
iii) 60 mins, critical ABDEHJ
iv) allocation for 3 people
v) allocation for 2 people
vi) A is critical, but so is B, which happens at the same time, so must reduce both to gain 5 minutes. 200+400=£600. Best is H and J: £500+£500 = £1000

6i) (0;0)-(1;1)-(2;1)-(3;0)-(4;0): weight 7
ii) 1 point
iii) (0;0)-(1;0) 1
(0;0)-(1;1) 2
(1;0)-(2;0) 1
(1;0)-(2;1) 1
(1;1)-(2;0) 2
(1;1)-(2;1) 1
(2;0)-(3;0) 0
(2;0)-(3;1) 0
(2;1)-(3;0) 2
(2;1)-(3;1) 0
(3;0)-(4;0) 1
(3;1)-(4;0) 2
iv) (0;0)-(1;0)-(2;0)-(3;0)-(4;0): 1 point per round maximum
9. (Original post by marioman)
Did anyone on here manage to augment the flow the second time?
Yep man, was just a standard hungarian algo. right?
10. I'm glad other people think that was a mistake too... I was ****ting myself 😂
11. what mark to people reckon for grade boundaries ?
12. (Original post by Fp3)
what mark to people reckon for grade boundaries ?
Usually high 50 low 60 for an A and between 6-8 between each grade

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13. (Original post by marioman)
Did anyone on here manage to augment the flow the second time?
That was a mean one but I found a route which you could augment by one, it involved going backwards on one of the arcs - I can't rmemeber which one, but basically, it meant a maximum flow of 8
14. I don't know I think grade boundaries are standard,, the only tricky question was number 6 which was due to the weirdness of it
62 for an A probably
15. (Original post by xsanda)
Xsanda’s solutions:

1) Matching
i) JF=3-ND=4
1:MA
2:-
3:JF
4:ND
5:JA
6:MJ
ii) SO=5-JA=2
1:MA 2:JA 3:JF 4:ND 5: SO 6:MJ
iii) 3=JF,4=ND,5=SO always
1:MJ 2:MA 3:JF 4:ND 5: SO 6:JA

2) Flow
i) FT = 2, DT = 4, cut = 9
iia) SCBFT +2 (given)
b) SCFBAEDT +1
iii) 8, with cut {SABCF}{DET} of value 8

3) Hungarian
i) Add dummy column X with 100 in each
Reduce rows -86, -91, -88, -98
Reduce cols -0,-2,-0,-2
ii) AS, BT, CL, no match for D, £271 cost
iii) CS, BT; AL costs £83

4) Rock paper scissors
i) scissors with paper: gain of 1, loss of 2: 1 + (-2) ≠ 0
ii) playsafe: scissors
iii) scissors 2-2p-4q, paper 3p+2q-2, rock 2q-p
iv) p=0.5, q=0.25, rock = 0.25

5) critical path analysis
i) F and H also critical
ii) A: -, B: -, C: -, D: A, E: BD, F: BCD, G: E, H: EF, I: GH, J: H
iii) 60 mins, critical ABDEHJ
iv) allocation for 3 people
v) allocation for 2 people
vi) A is critical, but so is B, which happens at the same time, so must reduce both to gain 5 minutes. 200+400=£600. Best is H and J: £500+£500 = £1000

6i) (0;0)-(1;1)-(2;1)-(3;0)-(4;0): weight 7
ii) 1 point
iii) (0;0)-(1;0) 1
(0;0)-(1;1) 2
(1;0)-(2;0) 1
(1;0)-(2;1) 1
(1;1)-(2;0) 2
(1;1)-(2;1) 1
(2;0)-(3;0) 0
(2;0)-(3;1) 0
(2;1)-(3;0) 2
(2;1)-(3;1) 0
(3;0)-(4;0) 1
(3;1)-(4;0) 2
iv) (0;0)-(1;0)-(2;0)-(3;0)-(4;0): 1 point per round maximum
Thats what I got My explanation for the cost being >200 for reducing activities A and B may have been a bit kerfuffled but other than that, I'm fairly pleased
16. (Original post by bassala)
Thats what I got My explanation for the cost being >200 for reducing activities A and B may have been a bit kerfuffled but other than that, I'm fairly pleased
Yeah I am the same, that part was only worth 2 marks though right?
17. (Original post by JoshuaHope)
Yeah I am the same, that part was only worth 2 marks though right?
The explanation part would be one mark and the part where you identify H and J is another mark so yeah
18. Found it all fine other than that flow augmentation, I had to say to ignore the one they had added in ii.a , and added two flow augmentation routes (one of flow 2, one of flow 1) to show a flow of 8 through
19. Who gives a cooking award to the person who's icing is of most similar quality to their baking?
20. (Original post by CuriosityKTMC)
Who gives a cooking award to the person who's icing is of most similar quality to their baking?
Isnt it least similar?

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