摘要：
Well, the basic idea is fairly straightforward. We maintain a mappingmpfrom a value innumsto its position (index)i. Each time we meet an unseen value,... 阅读全文
摘要：
This problem is a little tricky at first glance. However, if you have finished theHouse Robber problem, this problem can simply bedecomposed into two ... 阅读全文
摘要：
Well, have you solved thenextPermutationproblem? If so and you have handled the cases of duplicates at that problem, your code can be used in this pro... 阅读全文
摘要：
Well, have you solved thenextPermutationproblem? If so, your code can be used in this problem. The idea is fairly simple:sortnumsin ascending order, a... 阅读全文
摘要：
Well, in fact the problem of next permutation has been studied long ago. From theWikipedia page, in the 14th century, a man named Narayana Pandita giv... 阅读全文