摘要：
题目Given an array and a value, remove all instances of that value in place and return the new length.The order of elements can be changed. It ... 阅读全文
摘要：
题目Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length.Do not allocate extr... 阅读全文
摘要：
题目Given a linked list, reverse the nodes of a linked list k at a time and return its modified list.If the number of nodes is not a multiple o... 阅读全文
摘要：
题目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... 阅读全文
摘要：
题目Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two list... 阅读全文
摘要：
题目Given a string containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[’ and ‘]’, determine if the input string is valid.The brackets must clo... 阅读全文
摘要：
题目Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the... 阅读全文
摘要：
题目Given a linked list, remove the nth node from the end of list and return its head.For example,Given linked list: 1->2->3->4->5, and n = 2.A... 阅读全文
摘要：
题目Given a digit string, return all possible letter combinations that the number could represent.A mapping of digit to letters (just like on t... 阅读全文
摘要：
题目Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the thre... 阅读全文
