共享变量的拷贝和append操作线程不安全，导致map被多个协程操作，引发panic。

给定一个非负整数数组nums和一个整数m ，你需要将这个数组分成m个非空的连续子数组。 设计一个算法使得这m个子数组各自和的最大值最小。

当golang程序在运行过程中消耗了超出预期内存时，需要搞明白，到底是程序中哪些代码导致了这些内存消耗。此时，通常可以采用golang的pprof来分析golang进程的内存使用。

给你一个由若干括号和字母组成的字符串 s ，删除最小数量的无效括号，使得输入的字符串有效。 返回所有可能的结果。答案可以按任意顺序返回。

Given an m x n grid of characters board and a string word, return true if word exists in the grid.

Given a linked list, reverse the nodes of a linked list k at a time and return its modified list.

Given two strings text1 and text2, return common subsequence. If there is no common subsequence, return 0.

Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array.

通过先序和中序数组生成后序数组

A linked list of length n is given such that each node contains an additional random pointer, which could point to any node in the list, or null.Construct a deep copy of the list.

You want to schedule a list of jobs in d days. Jobs are dependent (i.e To work on the i-th job, you have to finish all the jobs j where 0 <= j < i).

Given a string s, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.

The n-queens puzzle is the problem of placing n queens on an n_×_n chessboard such that no two queens attack each other.

Coin Change You are given coins of different denominations and a total amount of money amount. Write a function to compute the fewest number of coins that you need to make up that amount. If that amount of money cannot be made up by any combination of the coins, return -1. Example 1: Input: coins = [1, 2, 5], amount = 11 Output: 3 Explanation: 11 = 5 + 5 + 1 Example 2: Input: coins = [2], amount = 3 Output: -1 Note: You may assume that you have an infinite number of each kind of coin. 思路： ....

You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise).

Given an m x n matrix. If an element is 0, set its entire row and column to 0. Do it in-place.

Given a collection of intervals, merge all overlapping intervals.

Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity.

给定一个链表，其中奇数位是升序的，偶数位是降序的，实现链表的排序。

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 lists.