buuctf misc wp 02 7.LSB 8.乌镇峰会种图 9.rar 10.qr 11.ningen 12.文件中的秘密 13.wireshark 14.镜子里面的世界 15.小明的保险箱 16.爱因斯坦 17.被嗅探的流量 18.假如给我三天光明 19.easycap 20.FLAG 7.LSB 这个题目,是一个LSB隐写. 下载题目,得到一张图片: 从题目的名字,大致就往LSB隐写的方向去考虑.用Stegsolve打开,发现在通道为0的时候,出现了上面这一栏. 另所有通道为0,sav…

[Educational Codeforces Round 16]E. Generate a String 试题描述 zscoder wants to generate an input file for some programming competition problem. His input is a string consisting of n letters 'a'. He is too lazy to write a generator so he will manually ge…

[Educational Codeforces Round 16]D. Two Arithmetic Progressions 试题描述 You are given two arithmetic progressions: a1k + b1 and a2l + b2. Find the number of integers x such that L ≤ x ≤ R andx = a1k' + b1 = a2l' + b2, for some integers k', l' ≥ 0. 输入 Th…

[Educational Codeforces Round 16]C. Magic Odd Square 试题描述 Find an n × n matrix with different numbers from 1 to n2, so the sum in each row, column and both main diagonals are odd. 输入 The only line contains odd integer n (1 ≤ n ≤ 49). 输出 Print n lines…

[Educational Codeforces Round 16]B. Optimal Point on a Line 试题描述 You are given n points on a line with their coordinates xi. Find the point x so the sum of distances to the given points is minimal. 输入 The first line contains integer n (1 ≤ n ≤ 3·105)…

[Educational Codeforces Round 16]A. King Moves 试题描述 The only king stands on the standard chess board. You are given his position in format "cd", where c is the column from 'a' to 'h' and dis the row from '1' to '8'. Find the number of moves perm…

BestCoder Round #16 题目链接 这场挫掉了,3挂2,都是非常sb的错误 23333 QAQ A:每一个数字.左边个数乘上右边个数,就是能够组成的区间个数,然后乘的过程注意取模不然会爆掉 B:dp,dp[i][2]记录下第一长的LIS,和第二长的LIS.哎,转移的时候一个地方写挫掉了导致悲剧啊QAQ C:首先假设知道Nim游戏的,就非常easy转化问题为.一些数字能否选几个能否异或和为0.那么就是每一个数字拆成40位.然后每一位异或和为0.这样就能够构造出40个方程,然后高斯消元…

Codeforces Beta Round #16 (Div. 2 Only) http://codeforces.com/contest/16 A 水题 #include<bits/stdc++.h> using namespace std; #define lson l,mid,rt<<1 #define rson mid+1,r,rt<<1|1 #define sqr(x) ((x)*(x)) #define maxn 500005 typedef long lo…

Codeforces Beta Round #16 (Div. 2 Only) E. Fish 题目链接:## 点击打开链接 题意: 有 \(n\) 条鱼,每两条鱼相遇都会有其中一只吃掉对方,现在给你一个 \(n * n\)的矩阵,表示 \(i\) 吃掉 \(j\) 的概率,最后问你每条鱼存活的概率. 题解: 最多有 \(18\) 条鱼,吃掉的概率都不一样,可以用状态压缩,设\(dp[1<<n]\)种状态,最多有 \(1<<18\) 种状态. $ dp[i]$ 表示当前鱼的状态为…

buuctf misc wp 01 1.金三胖 2.二维码 3.N种方法解决 4.大白 5.基础破解 6.你竟然赶我走 1.金三胖 root@kali:~/下载/CTF题目# unzip 77edf3b9-3ef9-4ead-9c81-ffdaf7a08414.zip Archive: 77edf3b9-3ef9-4ead-9c81-ffdaf7a08414.zip creating: 金三胖/ inflating: 金三胖/aaa.gif root@kali:~/下载/CTF题目# ls 37…