摘要：题目： Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight). For example, the 32-
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摘要：题目： Given a string, find the length of the longest substring without repeating characters. Examples: Given "abcabcbb", the answer is "abc", which the
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摘要：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
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摘要：题目： Given an integer (signed 32 bits), write a function to check whether it is a power of 4. Example:Given num = 16, return true. Given num = 5, retur
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摘要：题目： Given a positive integer n, break it into the sum of at least two positive integers and maximize the product of those integers. Return the maximum
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摘要：题目：Reverse String （难度一颗星） Write a function that takes a string as input and returns the string reversed.Example:Given s = "hello", return "olleh". 实现：
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摘要：题目描述： 请实现一个函数，将一个字符串中的空格替换成“%20”。例如，当字符串为We Are Happy.则经过替换之后的字符串为We%20Are%20Happy。 分析： 看到这个题目，我们都会有一个比较直观的加法，那就是遍历字符串，每当遇到空格，就在当前位置插入“%20”，当前位置的字符往后移
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摘要：请看题目描述： You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a
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摘要：求两个数之和。这个问题够简单吧！能做对绝对不是问题，问题是你是否能做的比较好。好了，请看题目： Given an array of integers, return indices of the two numbers such that they add up to a specific targ
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