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316. Remove Duplicate Letters321. Create Maximum Number402. Remove K Digits这三道题都用到了 stack 来求原序列中不打乱相对次序的最小子序列的技巧: 阅读全文
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http://blog.csdn.net/u014688145/article/details/72859739 阅读全文
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Given a circular array (the next element of the last element is the first element of the array), print the Next Greater Number for every element. The 阅读全文
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You are given two arrays (without duplicates) nums1 and nums2 where nums1’s elements are subset of nums2. Find all the next greater numbers for nums1' 阅读全文
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Given a sequence of n integers a1, a2, ..., an, a 132 pattern is a subsequence ai, aj, ak such that i < j < k and ai < ak < aj. Design an algorithm th 阅读全文