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BOOK: Puzzles for Programmers and Pros BOOK ISBN: 978-0-470-12168-9
This is the forum to discuss the Wrox book Puzzles for Programmers and Pros by Dennis Shasha; ISBN: 9780470121689
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Old July 24th, 2007, 01:04 PM
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Default Order the Ages - Left/Right versus "clockwise"

Hi! I solved the "Order the Ages" problem slightly differently, and came up with a different solution. Here was my thinking:
A + C + J + L + T = 135
C = 12 + C_left
T = 5 + T_right
J = 14 + J_left
L = L_left - 5
L < T < A < J < C
L_left = 21
C_left = 28
16 + 40 + 21 + 28 + ?? = 135, so ?? = 30
Therefore, 16 < 21 < 28 < 30 < 40, and T=21, A=28, J=30
Now, order the table.
C_left = A
T_right = L
L_left = T
J_left = L
So, I get: T, C, A, J, L
but the book got the opposite order!
Say I'm L and I look to my left, and see T... T would be clockwise of me, correct?
Or is 'left' and 'right' from the perspective of looking at the person? Usually, when we say that John is sitting to Bill's right, that John is at Bill's right-hand side, correct?
I suppose if everyone is facing *away* from the table, then the book is correct... but if they are actually sitting at the table facing inward, then I believe my solution is correct.
-- Glenn

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