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Shopping in Mars is quite a different experience. The Mars people pay
by chained diamonds. Each diamond has a value (in Mars dollars M$).
When making the payment, the chain can be cut at any position for only
once and some of the diamonds are taken off the chain one by one. Once
a diamond is off the chain, it cannot be taken back. For example, if we
have a chain of 8 diamonds with values M$3, 2, 1, 5, 4, 6, 8, 7, and we
must pay M$15. We may have 3 options:
1. Cut the chain between 4 and 6 ...
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Given two words (start and end), and a dictionary, find all shortest transformation sequence(s) from start to end, such that:
Only one letter can be changed at a time
Each intermediate word must exist in the dictionary
For example,
Given:
start ="hit"
end ="cog"
dict =["hot","dot","dog","lot","log"]
Return
[
["hit","hot","dot","dog","cog"],
["hit","hot","lot","log","cog"]
]
Note:
All words have the same length.
All words contain only lowercase alp ...
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