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　　一起畅想未来呜……黄胖子捂着胸口当真难受了一下子，杨公子，非这么凄美不成。等周行文再次睁开眼睛的时候，他从镜子上看到了一个年轻的自己，那是一个青春、精力旺盛、充满了朝气、眼中有着无穷希望的青年。汉军虽然之前在彭城遭遇了惨败，但是瘦死的骆驼比马大，比之西魏国还是强大不少。After obtaining the system address, the system can be constructed ("/bin/sh"); Attack program. Since there is no string/bin/sh in the program, we can use the read function to write it to a fixed position in memory before executing the system function.海宁？海宁是哪里？国语不好发音也不能差这么多吧？杨长帆扯子嗓子吼道：这里，沥海。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: