摘要：
1.题目描述 Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. For example, ... 阅读全文
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1.题目描述Given two sorted integer arrays A and B, merge B into A as one sorted array.Note:You may assume that A has enough space to hold additional elements from B. The number of elements initialized in A and B are m and n respectively.2.解法分析这道题是归并排序的变种，我们知道，归并那一步应该是要有一个O(N+M)的辅助数组的，由于题目中说可以假设A有足够的空间来容 阅读全文
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1.题目描述 Given an unsorted integer array, find the first missing positive integer. For example, Given ... 阅读全文