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Design an algorithm and write code to serialize and deserialize a binary tree. Writing the tree to a file is called 'serialization' and reading back f 阅读全文
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Combination Sum | Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to 阅读全文
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Backpack | Given n items with size Ai, an integer m denotes the size of a backpack. How full you can fill this backpack? Given n items with size Ai, a 阅读全文
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Jump Game | Given an array of non-negative integers, you are initially positioned at the first index of the array. Each element in the array represent 阅读全文
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Given an unsorted array of integers, find the length of the longest consecutive elements sequence. Clarification Your algorithm should run in O(n) com 阅读全文
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k Sum Given n distinct positive integers, integer k (k <= n) and a number target. Find k numbers where sum is target. Calculate how many solutions the 阅读全文