摘要： Given two integers dividend and divisor, divide two integers without using multiplication, division, and mod operator. Return the quotient after divid 阅读全文

摘要： Implement strStr(). Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. Clarification: What shoul 阅读全文

摘要： Given an array nums and a value val, remove all instances of that value in-place and return the new length. Do not allocate extra space for another ar 阅读全文

摘要： Given a sorted array nums, remove the duplicates in-place such that each element appears only once and returns the new length. Do not allocate extra s 阅读全文

摘要： Given a linked list, reverse the nodes of a linked list k at a time and return its modified list. k is a positive integer and is less than or equal to 阅读全文

摘要： Given a linked list, swap every two adjacent nodes and return its head. You may not modify the values in the list's nodes. Only nodes itself may be ch 阅读全文

摘要： You are given an array of k linked-lists lists, each linked-list is sorted in ascending order. Merge all the linked-lists into one sorted linked-list 阅读全文

摘要： Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. Input: n = 3Output: ["((()))","(()())","(())() 阅读全文

摘要： Merge two sorted linked lists and return it as a new sorted list. The new list should be made by splicing together the nodes of the first two lists. I 阅读全文

摘要： Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if: 阅读全文