Leetcode23

题目描述

1. Merge k Sorted Lists Solved Hard Topics premium lock icon Companies You are given an array of k linked-lists lists, each linke...

Leetcode22

题目描述

1. Generate Parentheses Solved Medium Topics premium lock icon Companies Given n pairs of parentheses, write a function to gener...

Leetcode21

题目描述

You are given the heads of two sorted linked lists list1 and list2.

Merge the two lists into one sorted list. The list should...

leetcode20题解

题目描述

Given a string s containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[’ and ‘]’, determine if the input string is valid.

A...

leetcode19题解

题目

Given the head of a linked list, remove the nth node from the end of the list and return its head.

解题思路

虽然...

leetcode18题解

题目描述

Given an array nums of n integers, return an array of all the unique quadruplets [nums[a], nums[b], nums[c], nums[d]] such that:<...