小白兔云

摘要： Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in-place. Example 1: Input: [ [1,1,1], [1,0,1], [1,1,1] ] Output: 阅读全文

摘要： Given an absolute path for a file (Unix-style), simplify it. Or in other words, convert it to the canonical path. In a UNIX-style file system, a perio 阅读全文

摘要： Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right which minimizes the sum of all numbers along its path. 阅读全文

摘要： A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below). The robot can only move either down or right at any p 阅读全文

摘要： 程序执行结果： 1.使用wait(),notify(),notifyAll()方法之前，要获取同一个对象的锁。 2.调用wait()方法之后，线程会从RUNABLE状态变为WAITING状态，并会释放对象锁，并会将线程移入到对象的等待队列中。 3.notify()和notifyAll()调用之后，等 阅读全文

摘要： A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below). The robot can only move either down or right at any p 阅读全文

摘要： The set [1,2,3,...,n] contains a total of n! unique permutations. By listing and labeling all of the permutations in order, we get the following seque 阅读全文

摘要： 其中第五种采用了Java8中的lambda表达式进行遍历。 阅读全文

摘要： Implement pow(x, n), which calculates x raised to the power n (x^n). Example 1: Input: 2.00000, 10 Output: 1024.00000 Example 2: Input: 2.10000, 3 Out 阅读全文

摘要： You are given an n x n 2D matrix representing an image.Rotate the image by 90 degrees (clockwise). Note: You have to rotate the image in-place, which 阅读全文