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I. overview Singleton pattern is a relatively simple and common design pattern in design pattern, but it is also a very classic high-frequency interview question. I believe there are still many people hanging here during the interview. This article mainly reviews the singleton pattern, recording its application scenarios, common writing, debugg ...

Buses and People 3D Processing Main theme: there are n buses, each bus has s (starting point), f (end point), t (departure time), there are m individuals, each person has l (starting point), R (end point), t (appear time). For a person, when t <= t (car), s <= l, r <== f, he can get on the ca ...

Bob's brother lives in France. There are n cities in France, and there are n-1 two-way roads connecting these cities. These cities are numbered from 1~n. You can follow these roads from one city to any other city.   Bob's brother worked in the "two way" company and just got to repair a ...

Some nonsense: In memory of hin, a long time ago, the elder gellygoat told us about the monotonous queue that never moved again in his nest. qbxt's computer compiled once 9s+ can starfish. f10 is really good. Topic transfer Does the data look like it can be clipped by a line segment tree? As a board question of monotone queue, this qu ...

(mobile phone horizontal screen source code is more convenient) problem (1) what is atomic manipulation? (2) What is the relationship between atomic operation and ACID of database? (3) How does Atomic Integer implement atomic operations? (4) what are the shortcomings of AtomicInteger? brief introduction Atomic Integer is an atomic class provid ...

Background Introduction:Because of the continuous expansion of backup data, it is necessary to transfer the backup data (about 2T) from the existing network back to the local area for remote storage. But 2T is too big and needs to be compressed. Here we use 3G as a compression package. Here is the compression script #!/bin/bash # This script i ...

The blogger has written archive scripts for many projects. For the script development of deleting data, it must be the simplest delete statement at the beginning. Then, because of the large amount of data in some tables and the large number of indexes, it will be found that deleting data is very slow and affects the normal use of the system. Th ...

A less slow pressure??? There's no purple question at all. The data is still so water. I'm not going to tell you I'm hack ed. Look at the data size, n < 12, decisive pressure. Then the starting point needs to be enumerated, and the dp state is set: f[i][j]= takes I as the starting point to minimize the cost of J status. Where j is ...

Foreign Key If there's a table today with a lot of job information on it We can associate two tables by using foreign keys Such benefits can save space, for example, you have a long job title today, it is a waste of space to repeat the name of the job in a table; besides, it can also play a restraining role. Departments, for example, ar ...

Title Description Enter an integer array to determine whether the array is the result of a post-order traversal of a binary search tree. If yes, output Yes, otherwise output No. Assume that any two numbers of the input array are different from each other. Knowledge points: 1. Post-order traversal ...