Given two integers n and k, return all possible combinations of k numbers out of 1 … n. Example: 12345678910Input: n = 4, k =...

The set [1,2,3,...,n] contains a total of n! unique permutations. By listing and labeling all of the permutations in order, w...

Given a collection of intervals, merge all overlapping intervals. Example 1: 123Input: [[1,3],[2,6],[8,10],[15,18]]Output: [[...

Given a positive integer n, generate a square matrix filled with elements from 1 to n2 in spiral order. Example: 1234567Input...

Number of Islands Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An isl...

Rotate List Given a linked list, rotate the list to the right by k places, where k is non-negative. Example 1: 12345Input:...

jar包放置在hadoop平台出现 Caused by: java.util.zip.ZipException: error in opening zip fileat java.util.zip.ZipFile.open(Native Method...

Given an array of strings, group anagrams together. For example, given: ["eat", "tea", "tan", &...

You are playing the following Bulls and Cows game with your friend: You write down a number and ask your friend to guess what...

Given two non-negative integers num1 and num2 represented as strings, return the product of num1 and num2. Note: The length ...