1037. Valid Boomerang
A boomerang is a set of 3 points that are all distinct and not in a straight line. Given a list of t...
1033. Moving Stones Until Consecutive
Three stones are on a number line at positions a, b, and c. Each turn, you pick up a stone at an end...
1030. Matrix Cells in Distance Order
We are given a matrix with R rows and C columns has cells with integer coordinates (r, c), where 0 &...
1022. Sum of Root To Leaf Binary Numbers
You are given the root of a binary tree where each node has a value 0 or 1. Each root-to-leaf path r...
1021. Remove Outermost Parentheses
A valid parentheses string is either empty (""), "(" + A + ")", or A +...
1018. Binary Prefix Divisible By 5
Given an array A of 0s and 1s, consider N_i: the i-th subarray from A[0] to A[i] interpreted as a bi...
1013. Partition Array Into Three Parts With Equal Sum
Given an array of integers arr, return true if we can partition the array into three non-empty parts...
1009. Complement of Base 10 Integer
Every non-negative integer N has a binary representation. For example, 5 can be represented as "...
关于TCP Keepalive
最近在分析应用接入的一个奇怪现象。我负责了一个服务端，开放一个端口提供服务。中间由类似于LVS的四层负载提供LB服务。 在服务端模拟网络异常，由于LVS有超时机制，会中断两个方向的连接，同时中断之后不...
1005. Maximize Sum Of Array After K Negations
Given an array A of integers, we must modify the array in the following way: we choose an i and repl...