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向量化地实现 Logistic Regression 算法. 阅读全文
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Find the contiguous subarray within an array (containing at least one number) which has the largest product. For example, given the array , the contig 阅读全文
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Find all possible combinations of k numbers that add up to a number n, given that only numbers from 1 to 9 can be used and each combination should be 阅读全文
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Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. For example, If n = 4 and k = 2, a solution is: 做了好几个这种题了，就是 阅读全文
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Given a collection of numbers that might contain duplicates, return all possible unique permutations. For example, have the following unique permutati 阅读全文
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vector 判断是否存在某元素: 阅读全文
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Given a collection of distinct numbers, return all possible permutations. For example, [1,2,3] have the following permutations: 做了几个 backtrack 类的题目了, 阅读全文
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Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. Each num 阅读全文
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Given a set of candidate numbers (C) ( without duplicates ) and a target number (T), find all unique combinations in C where the candidate numbers sum 阅读全文
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vector 弹出末尾元素 v.pop_back(); 阅读全文