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Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:Private TreeNode parent;Death Rift Mission End独居吉祥寺的大学生・纯（桥本爱），某天被找寻已故父亲昔日恋人・佐知子的高中生ハル（永野芽郁）造访。一起寻找佐知子的过程中，两人结识了佐知子的孙子・トキオ（染谷将太）。三人从去世的佐知子的遗物里找到录有ハル父亲和佐知子歌声的开盘式磁带，但磁带中途歌声戛然而止，因此，三人决定共同完成乐章.....For collaboration files, it is not necessary to check out, as long as you have modification permission, you can modify them.As shown in the above figure, the server side provides NTP service. Attacker sends an NTP monlist Request to the server, but its source IP address is not its own IP address, but the IP address of the target. After the server receives the request, it will send a Response message to Target (not Attacker). Since Reponse contains 600 time synchronization records with Server, which is much larger than Request and consists of many messages, amplification is realized.