求教LOGIC GAME

smpowe

LOGIC GAME 求教

A cruise line is scheduling seven week-long voyages for the
ship Freedom. Each voyage will occur in exactly one of the
first seven weeks of the season: weeks 1 through 7. Each
voyage will be to exactly one of four destinations:
Guadeloupe, Jamaica, Martinique, or Trinidad. Each
destination will be scheduled for at least one of the weeks. The
following conditions apply to Freedom’s schedule:
Jamaica will not be its destination in week 4.
Trinidad will be its destination in week 7.
Freedom will make exactly two voyages to Martinique,
and at least one voyage to Guadeloupe will occur in some
week between those two voyages.
Guadeloupe will be its destination in the week preceding
any voyage it makes to Jamaica.
No destination will be scheduled for consecutive weeks.

13. If Freedom makes a voyage to Trinidad in week 5,
which one of the following could be true?

(A) Freedom makes a voyage to Trinidad in week 1.
(B) Freedom makes a voyage to Martinique in week 2.
(C) Freedom makes a voyage to Guadeloupe in week 3.
(D) Freedom makes a voyage to Martinique in week 4.
(E) Freedom makes a voyage to Jamica in week 6.



Why answer is (D)?

According to the question, the linear could be as following:

G / M / G / M /  T / J / T

请教牛人, TKS

berries

根据条件3，肯定有MGM这样的顺序出现，中间可以有间隔
第13题，因为week5和7都是T了，所以MGM肯定摆在前4个week。如果week123为MGM，剩下的空位没有连续两个week，而根据条件4，J和G必须连续，于是J没有地方摆放。可以知道只能是MGJM放在1234。所以选D。
第16题，一个M在week3，那么另一个可以在week5或6，选项E中week5有M，但是week4只能为G，于是排除。剩下的考虑M在week6，而week4或5里面必定有一个G，排除CDE；而G必须在J前面，于是排除B。所以选A。

只是我的思路，不一定是最优算法。

smpowe

About Logic Game

A cruise line is scheduling seven week-long voyages for the
ship Freedom. Each voyage will occur in exactly one of the
first seven weeks of the season: weeks 1 through 7. Each
voyage will be to exactly one of four destinations:
Guadeloupe, Jamaica, Martinique, or Trinidad. Each
destination will be scheduled for at least one of the weeks. The
following conditions apply to Freedom’s schedule:
Jamaica will not be its destination in week 4.
Trinidad will be its destination in week 7.
Freedom will make exactly two voyages to Martinique,
and at least one voyage to Guadeloupe will occur in some
week between those two voyages.
Guadeloupe will be its destination in the week preceding
any voyage it makes to Jamaica.
No destination will be scheduled for consecutive weeks.


16. If Freedom makes a voyage to Martinique in week 3,
which one of the following could be an accurate list of
Freedom’s destinations in week 4 and week 5,
respectively?

(A) Guadeloupe, Trinidad
(B) Jamaica, Guadeloupe
(C) Martinique, Trinidad
(D) Trinidad, Jamaica
(E) Trinidad, Martinique

Why answer  is (A)?