for 循环必须以可迭代对象作为被循环的对象，while 循环则不同，它是依据一定的条件进行循环，即只要满足某条件，循环体中的语句“总跑着”。

主线程依次启动三个线程，必须四个线程都执行到pthread_barrier_wait()后，后续的pthread_barrier_destroy()才会执行

在大学的学习中，一开始自认为已经学会了反码与补码，但在看到多种表述之后，反而是越来越乱，疑惑越来越多，即使记住了之后又会混淆，今天又看到了一次，为了防止以后再次忘记，写这篇博客记录一下（记录过程依据《数字电子技术（第十版...

Find the sum of all left leaves in a given binary tree.

Given a binary tree and a sum, find all root-to-leaf paths where each path’s sum equals the given sum.

Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum. 给定一棵二叉树和su...

Given preorder and inorder traversal of a tree, construct the binary tree. 根据前序和中序遍历序列构建二叉树。 Note: You may assume that duplicates do not exist in the tree.

is_uniform.mfunction output = is_uniform(input) Uniform_list=[2,3,4,5,7,8,9,13,15,16,17,25,29,31,32,33,49,57,61,63,64,65,97,113,121,125,127,128,129,130,13...

二分查找logn复杂度binary_search：点查left_bound：左边界right_bound：右边界func binary_search(nums []int, target int) int {left, right := 0, len(nums)-1for left <= right ...