Simple Calc 明显的memcpy栈溢出,是一个静态链接的程序所以没给libc.发现里面有: 参数a1应该为_libc_stack_end的地址了._stack_prot通过rop修改为0x7即111b,这样的话stack就是可执行的了,然后就可以执行shellcode啦! #!/usr/bin/python from pwn import * import time #wah #context.log_level = 'debug' #s = remote('simplecalc.bo…

ANTLR简介 ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files. It's widely used to build languages, tools, and frameworks. From a grammar, ANTLR…

2016暑假多校联合---A Simple Chess   Problem Description There is a n×m board, a chess want to go to the position (n,m) from the position (1,1).The chess is able to go to position (x2,y2) from the position (x1,y1), only and if only x1,y1,x2,y2 is satisfied…

Recently I built plug-ins support to my TemperatureStation IoT solution web site. The code for .NET Core is different from what we have seen on full .NET Framework (application domains etc) but there’s still nothing complex. This blog post describes…

w https://developer.mozilla.org/en-US/docs/Web/CSS/calc The calc() CSS function can be used anywhere a <length>, <frequency>, <angle>, <time>, <number>, or <integer> is required. With calc(), you can perform calculation…

题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5794 A Simple Chess Time Limit: 2000/1000 MS (Java/Others)Memory Limit: 65536/65536 K (Java/Others) 问题描述 There is a n×m board, a chess want to go to the position (n,m) from the position (1,1). The chess…

题目链接 A Simple Chess 打表发现这其实是一个杨辉三角…… 然后发现很多格子上方案数都是0 对于那写可能可以到达的点(先不考虑障碍点),我们先叫做有效的点 对于那些障碍,如果不在有效点上,则自动忽略 障碍$(A, B)$如果有效,那么就要进行如下操作: 以这个点为一个新的杨辉三角的顶点,算出目标点的坐标$(x, y)$. 目标点的答案减去$C(A, B) * C(x, y)$的值. 但是这样会造成重复计算,原因是障碍之间可能有相互影响的关系. 这个时候就要考虑容斥原理,DFS消除这…

最近天气变化无常,身为程序猿的寡人!~终究难耐天气的挑战,病倒了,果然,程序猿还需多保养自己的身体,有句话这么说:一生只有两件事能报复你:不够努力的辜负和过度消耗身体的后患.话不多说,开始吧. 一.什么是简单工厂模式 简单工厂 (Simple Factory)又称静态工厂方法模式(Static Factory Method Pattern) 使用的频率也是非常高,它的官方解释为:定义一个用于创建对象的接口,让子类决定实例化哪一个类.工厂模式使一个类的实例化延迟到其子类. 这个模式本身很简单而且使…

原文链接:http://www.c-sharpcorner.com/UploadFile/19b1bd/design-patterns-simplified-part3-factory/ Design Patterns Simplified - Part 3 (Simple Factory)[设计模式简述--第三部分(简单工厂)] This article explains why and how to use the Simple Factory Design Pattern in softw…

开启阅读模式 WATERHAMMER A COMPLEX PHENOMENON WITH A SIMPLE SOLUTION Waterhammer is an impact load that is the most misunderstood force known to pressure transducers today. A waterhammer is created by stopping and/or starting a liquid flow suddenly. The re…