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题目：You are a product manager and currently leading a team to develop a new product. Unfortunately, the latest version of your product fails the qualit 阅读全文
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题目： Write a function to find the longest common prefix string amongst an array of strings. 题目解答： 求一组字符串的最长公共前缀。使用迭代器数组实现。思路异常的简单。 代码如下： class Solution 阅读全文
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题目： Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1's in their binary representation a 阅读全文
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题目： Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. Example: Note: 题目解答：这个题目说了，会反复的求一段数字的和，但是默认数 阅读全文