Brute-force Algorithm(矩阵快速幂&欧拉降幂) 题意 a , b , a b , a b 2 … a,b,ab,ab^2\dotsa,b,ab,ab2…序列的a , b a,ba,b指数是斐波那契形式,求在模p pp意义下的第n nn项。 思路 考虑先用矩阵快速幂预处理出a , b a,ba,b的指数,因为指数非常大,考虑欧拉降幂,只需要矩阵乘法中...
hdu 3221 Brute-force Algorithm 题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=3221 矩阵乘法和数学的结合。 由题目意思可知:f[n]=f[n-1]*f[n-2]; f的前面几项可以罗列出来: a^1*b^0,a^0 *b^1,a^1*b^1,a^1 *b^2,a^2*b^3... 可以发现a的指数和b的指数均类似于斐波那契数列。
相应的值表示也可为a^1*b^0%p。a^0*b^1%p,a^1*b^1%p,...a^fib[n-3]*b^fib[n-2]%p。即a,b的指数从n=3以后与fib数列一样。 由于n非常大。fib[n]也想当大。 a^fib[n]%p能够利用a^fib[n]%p = a^(fib[n]%phi[p]+phi[p])%p进行降幂,条件时fib[n]>=phi[p]。求fib[n]%phi[...
2 #include <string> 3 using namespace std; 4 5 int BF(const string& father, const string& son) //返回首次匹配的字符串中的第一个匹配的字符的下标 6 { 7 int i = 0, j = 0; //i表示主串下标,j表示子串下标 8 while (i < father.size() && j < son.size()) 9 { 10 if (father...
Hackers do not need to do much of the work. All they have to do is create an algorithm or use readily available brute force attack programs to automatically run different combinations of usernames and passwords until they find the right combination. Such cyberattacks account for roughly 5 perce...
Sometimes, brute force attacks are still done by hand, meaning that there’s an actual person sitting in some basement and playing a guessing game with your credentials. But, more often than not these days, the hackers use a brute force algorithm, or brute force password cracker, which is,...
1) brute-force algorithm 蛮力算法2) act recklessly 蛮力法3) brute force. 蛮力 例句>> 4) brute strength 暴力;蛮力5) Leges Ronanae Barbaricae 蛮族法 例句>> 6) The aboriginal tribes 蛮 例句>> 补充资料:蛮力 1.粗笨的气力。 说明:补充资料仅用于学习参考,请勿用于其它任何用途。
Algorithm-based encryption methods known as hash functions produce long, randomized passwords that can be used by cracking tools to guess their outputs. Dictionary bots Through dictionary attacks, brute force tools can brush past single-word passwords in the blink of an eye. ...
Brute Force TechniqueEthical HackingHacking is a serious problem. The incidences of computer hacking have increased dramatically over the years. To solve a problem first to understand how the problem occur into the system. Hacking is done by the hackers also known as the expert programmers. ...
Areverse brute-force attackbegins with the attacker using a common password -- or already knowing a password -- against multiple usernames orencryptedfiles to gain network and data access. The hacker will then follow the samealgorithmas a typical brute-force attack to find the correct username....