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比特币
比特币主要用到了密码学中的两个功能:1.哈希2.签名1.密码学中用到的哈希函数被称为cryptographic hash function: 它有两个重要的性质:①collision(这里指哈希碰撞) resistance :例如x≠y H(x)=H(y) 两个不同的输入，输出却是相等的，这就称哈希碰撞。它是不可避免的，因为输入空间Rational Resistance CodeForces - 343A
原题链接 考察:数论 思路: 串联: \(\frac{a}{b}+1 = \frac{a+b}{b}\) 并联: \(\frac{a}{b}与1并联--> \frac{a}{a+b}\) 也就是说分子分母不论大小可以得到相同的结果 Code #include <iostream> #include <cstring> using namespace std; typedef long long LL; LL a,Blog 4: Managing Change
When the manager tries to change the policy or method, some members will produce resistance reaction, and the older the employee is, the stronger the resistance reaction will be. Because they are used to their own ways and methods, and they may have worke