摘要： 题目描述： Find the contiguous subarray within an array (containing at least one number) which has the largest product. For example, given the array [2,3,- 阅读全文

摘要： 题目描述： 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 shou 阅读全文

摘要： 题目描述： Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element. Fo 阅读全文

摘要： 题目描述： Given an array of n positive integers and a positive integer s, find the minimal length of a contiguous subarray of which the sum ≥ s. If there 阅读全文

摘要： 题目描述： Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive. For example, given the ran 阅读全文

摘要： 题目描述： Given a list of non negative integers, arrange them such that they form the largest number. For example, given [3, 30, 34, 5, 9], the largest fo 阅读全文

摘要： 虚函数概念： 在类的定义中，前面有virtual关键字的成员函数就是虚函数。 virtual关键字只用在类定义里的函数声明中，写函数体时不用。 构造函数和静态成员函数不能是虚函数。 多态的表现形式： 1) 派生类的指针可以赋给基类指针。 通过基类指针可以调用基类和派生类中的同名虚函数时：指针指向哪个 阅读全文

摘要： 题目描述： Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting a 阅读全文

摘要： 题目描述： Given a binary tree, imagine yourself standing on the right side of it, return the values of the nodes you can see ordered from top to bottom. F 阅读全文

摘要： 题目描述： A peak element is an element that is greater than its neighbors. Given an input array where num[i] ≠ num[i+1], find a peak element and return it 阅读全文