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xctf攻防世界 CRYPTO高手进阶区 banana-princess

1. 进入环境,下载附件 题目给了个压缩包,包含一个pdf文件,尝试使用pdf阅读器打开,提升文件已损坏。 2. 问题分析 我们将其放入winhex中,并打开一个正常的pdf文件,观察并对比其中的差异,正常的如图: 给的文件如图: 50 44 46 -> 43 51 53,将其转换成十进制,80 68 70 -> 67 81 83,发现字

【思维+DP】UVA10635 Prince and Princess

分析 如果直接使用LCS来解决,那么复杂度为 \(O(pq)\) ,显然会超时。 因为给出的两个序列的数都是互不相同的,我们将第一个序列的数按 \(1,2,3...\) 依次编号,然后将第二个序列的数(当然这个数应该是存在于第一个序列的)按照数值映射到相应的编号中,注意到题目所求的LCS恰好就是第二个数列

2020.12.20-Codeforces Round #105补题

B - Escape The princess is going to escape the dragon's cave, and she needs to plan it carefully. The princess runs at vp miles per hour, and the dragon flies at vd miles per hour. The dragon will discover the escape after t hours and will chase the

负载均衡算法(待续)

原文连接:假如古代皇帝也懂负载均衡算法   轮询算法   据史料记载,乾隆一生妃嫔就有42人,还不算大明湖畔的夏雨荷等在下江南时候留下的情。   假设在某个时期内,皇阿玛最宠幸的有令妃、娴妃、高贵妃、纯妃四位。那普通的轮询算法怎么去选择呢?我们先定义一个妃子集合如下: /** *

next_permutation的使用-Hdu1027

Ignatius and the Princess II Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 14475    Accepted Submission(s): 8296 Problem Description Now our hero finds the door to the BEelzebub feng5166. He op

【HDU 1027】Ignatius and the Princess II

Now our hero finds the door to the BEelzebub feng5166. He opens the door and finds feng5166 is about to kill our pretty Princess. But now the BEelzebub has to beat our hero first. feng5166 says, "I have three question for you, if you can work them ou

CodeForces - 875F Royal Questions (基环树)

Royal Questions   In a medieval kingdom, the economic crisis is raging. Milk drops fall, Economic indicators are deteriorating every day, money from the treasury disappear. To remedy the situation, King Charles Sunnyface decided make his n sons-princes

hdu4685 Prince and Princess(tarjan强连通分量+二分图匹配)

思路来源 https://blog.csdn.net/sdj222555/article/details/9990131 预备题目 poj1904 King's Quest n个(n<=2000)王子,n个公主, 已知第i个王子喜欢ki个公主,以下给出k个数代表各个公主编号 最后给出一种完美匹配,代表第j个公主最终选择了哪个王子 要求求出每个王子的可能喜欢的

牛客 201 J Princess Principal (括号, 栈模拟)

大意: 给定序列$a$, $a_i$为偶数代表第$\frac{a_i}{2}$种左括号, 否则为第$\frac{a_i-1}{2}$种右括号. 询问区间是否是合法括号序列.     #include <iostream>#include <sstream>#include <algorithm>#include <cstdio>#include <math.h>#include <set>#include <map>

HDU4685:Prince and Princess(二分图匹配+tarjan)

Prince and Princess Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 65535/32768 K (Java/Others)Total Submission(s): 2281    Accepted Submission(s): 677 题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4685 Description: There are n princes and

Bag of mice(概率DP)

Bag of mice  CodeForces - 148D  The dragon and the princess are arguing about what to do on the New Year's Eve. The dragon suggests flying to the mountains to watch fairies dancing in the moonlight, while the princess thinks they should just go to be