摘要： 题目描述： Given a collection of distinct numbers, return all possible permutations. For example,[1,2,3] have the following permutations: 题目要我们找到数组（无重复元素）的 阅读全文

摘要： 题目描述： Given two non-negative integers num1 and num2 represented as strings, return the product of num1 and num2. Note: 题目要我们计算两个数（string形式，非负，只含数字，长度小 阅读全文

摘要： 题目描述： Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. Ea 阅读全文

摘要： 题目描述： Given a set of candidate numbers (C) (without duplicates) and a target number (T), find all unique combinations in C where the candidate numbers 阅读全文

摘要： 题目描述： Determine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules. The Sudoku board could be partially filled, where empty cells are fill 阅读全文

摘要： 题目描述： Given an array of integers sorted in ascending order, find the starting and ending position of a given target value. Your algorithm's runtime co 阅读全文

摘要： 题目描述： Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2). 阅读全文

摘要： 题目描述： Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such arrangement is not 阅读全文

摘要： 题目描述： Given a linked list, swap every two adjacent nodes and return its head. For example, Given 1->2->3->4, you should return the list as 2->1->4->3. 阅读全文

摘要： 题目描述： Given a linked list, remove the nth node from the end of list and return its head. For example, Note: Given n will always be valid. Try to do th 阅读全文