aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAsQAAAJYCAIAAADqk2fsAAAgAElEQVR4nO3dPVLrytbG8XcS5AyEWA…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAs4AAAIUCAIAAACFKz0yAAAgAElEQVR4nO3dPXLruLaG4TsJ5RqIYw…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAtIAAAJqCAIAAACJkTDlAAAgAElEQVR4nO3du3Ljvpa34b4J574Qx7…

乘数密码 时间限制:1000 ms  |  内存限制:65535 KB 难度:1 ->    Link    <- 简单代替密码的第二种,比移位密码稍微复杂点,不过鉴于NYOJ,是完全可以暴力的,这里主要是介绍一种逆元解法: 加密公式:Ek(m)=k*m%q,gcd(k,q)=1; 解密算法:Dk(c)=cK^-1%q,K^-1为k在模q下的乘法逆元. 那么怎么算这个逆元的,可以用扩展欧几里德算法:但注意K^-1*k%q=1;所以也可以暴力解: #include<bits/stdc++.…

仿射密码 时间限制:1000 ms  |  内存限制:65535 KB 难度:1 ->   Link   <- 和乘数密码差不多: 加密算法:Ek(m)=(k1*m+k2)%q;gcd(k1,q)=1; 解密算法:Dk(c)=k1^-1(c-k2)%q;k1^-1为k1在模q下的乘法逆元: 注意:k1为1时,相当于移位密码,当k2为0时相当于乘数密码:k1,k2同时为(1,0)时无效: 关键也在求逆元,在这里完全可以暴力解了: #include<bits/stdc++.h> usi…

…

描述 今天发现了nyoj,如获至宝.准备开刷. 括号配对问题 现在,有一行括号序列,请你检查这行括号是否配对.   输入 第一行输入一个数N(0<N<=100),表示有N组测试数据.后面的N行输入多组输入数据,每组输入数据都是一个字符串S(S的长度小于10000,且S不是空串),测试数据组数少于5组.数据保证S中只含有"[","]","(",")"四种字符 输出 每组输入数据的输出占一行,如果该字符串中所含的括号是…

--------------------------------------------- 这道题有点坑,也怪我总是有点马虎,按照正常人的思维0是表示有水池啊竟然是1表示有水池,最坑的是写反了竟然还能过样例一直以为是自己程序问题review了好多遍.... 图论基础题,染色法即可. AC代码: import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc=new…

-----------------------------------------n-1条边的无向连通图是一棵树,又因为树上两点之间的路径是唯一的,所以解是唯一的.(注意并不一定是二叉树,所以最好采用存储图的方式存储树,我使用的是邻接表)这个时候只需要考虑如何求解两点间的路径呢?遍历就可以了.但是应该如何遍历呢?比较容易想到的办法是分别从每个点计算到S点的路径,既然它们的终点相同,那为什么不逆向一下干脆从S点向这些点出发呢?所以现在问题就转化为了从S点出发遍历树,OK,这个问题就比较简单了,只需…

-------------------------------------祭出BigInteger AC代码: import java.math.BigInteger; import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc=new Scanner(System.in); int n=sc.nextInt(); BigInteger ans=fac(n);…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAsYAAAK1CAIAAABEvL+NAAAgAElEQVR4nO3drXLkurvv8X0T4bmQYF…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAs8AAANvCAIAAACte6C6AAAgAElEQVR4nOydPbLcNhOu7yaUayGOZy…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAssAAAOTCAIAAADGwNmiAAAgAElEQVR4nOy9PY7cyLPufTchXwsZu9…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAssAAANLCAIAAAA4rUfgAAAgAElEQVR4nOydq7LdyrKm+yXM/SDG4y…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAssAAAJUCAIAAABsWvwaAAAgAElEQVR4nO3dPXLjuraG4TsJ5xqIYw…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAscAAAHuCAIAAAD83zYaAAAgAElEQVR4nO3dP1LjygIv4LcJ5yyE2A…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAsEAAAKBCAIAAAA5i+FPAAAgAElEQVR4nO3dPXLbugMv7LsJ916Iay3i3i4eNe68gjRq7Mp9Gs+ofRsXzqRVf4rMpIk7dSn/S9Bb8EMACJIgLDm28zzjOSeWSPBLFn4EQPL/HAAAlvs/f3sFAIAPSYYAAGrIEABADRkCAKghQwAANWQIAKCGDAEA1JAhAIAaMgQAUEOGAABqyBAAQ…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAr4AAAHvCAIAAAA930vtAAAgAElEQVR4nO3dPVLjysIG4G8T5CyE2AsZygkZKyBRYiLySajyCgiYInV+AqomgczZhHcJ+gL9uCV1S93GDD/zPEXdC7Lcaklz3K+6W/L/1QAA2f7voysAAHwlogMAUEB0AAAKiA4AQAHRAQAoIDoAAAVEBwCggOgAABQQHQCAAqIDAFBAdAAACogOA…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAs0AAAIICAIAAAAaCETRAAAgAElEQVR4nO3drW7jWtwv4PcmwnMhxbmQqULKSg8ZEpKiSu9hQyqFHlLQUWn4BpWGtCyscF+CD/DXsr1sr2S6dpv0eRRpWsffGXX98l/L9v8UAAB5/M9n7wAAcLHkDAAgFzkDAMhFzgAAcpEzAIBc5AwAIBc5AwDIRc4AAHKRMwCAXOQMACAXOQMAy…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAsEAAAIBCAIAAAAnO/WXAAAgAElEQVR4nO3dq3IbSeM34L0Jc/O9BW…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAsMAAAIqCAIAAABOpdBfAAAgAElEQVR4nO3drXLbzP834P9JhOdAgn0gzZiEhT6kRCRB4SWZ8REEpFNqfoPOlDTMrPB3CHqA3nallbTexGniXtd05r5jy3q1tR99d239Xw0AUOr//vYKAACfmCQBAJSTJACAcpIEAFBOkgAAykkSAEA5SQIAKCdJAADlJAkAoJwkAQCUkyQAgHKSB…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAsQAAAJhCAIAAADJ5jGJAAAgAElEQVR4nO3dq3LkSPg36O8mzH0hxnUTS75oRxEzgyVLhojYyBG7bIgjiv6JgTuaFlk0oCOGtFmxhnMJ+oBOmanUoZwuH6qfJxwx4ypJpYO78qc3U9L/qgEACvyvj14BAOBrEyYAgCLCBABQRJgAAIoIEwBAEWECACgiTAAARYQJAKCIMAEAFBEmA…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAr8AAAHxCAIAAADrwUM4AAAgAElEQVR4nO3dLXLjytfH8f8mzLOQYC…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAscAAAJgCAIAAADpjVkvAAAgAElEQVR4nO3du04jS/gv7H0T5FwIsa9jC+SEjGDHkziBCGl/wZZIkJz+EwJGkzpfwUgkQ+ZswrkEf0GfqqqrD4bCGPM8Gmkt7Haf3fXrt8vd/2sHAFDC//rsGQAAToRUAQCUIVUAAGVIFQBAGVIFAFCGVAEAlCFVAABlSBUAQBlSBQBQhlQBAJQhV…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAsUAAAHXCAIAAADbX7BCAAAgAElEQVR4nO3dvVLrSMAm4L0Jci6E2B…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAr4AAAInCAIAAADxjM2pAAAgAElEQVR4nO3dPVLjStsG4G8T5CyE2A…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAsYAAAI0CAIAAACRUHjwAAAgAElEQVR4nO3dO3LbyroG0DsJ5RqIYg…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAsIAAAJhCAIAAADE+EHOAAAgAElEQVR4nO3drXLjSAMu4HMT4bmQYF…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAsAAAAIZCAIAAAAnfB5fAAAgAElEQVR4nO3dO1LjygIG4LsJchZC7IUM5YSMFZA4gYichCqvgICpSZ2fgKpJIHM24SzBN9CrW+qW1Mbm4fm+os4Z27LeUv/qbkv/2wEAFPrfZ88AAPD9CBAAQDEBAgAoJkAAAMUECACgmAABABQTIACAYgIEAFBMgAAAigkQAEAxAQIAKCZAAADFB…

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAr4AAAK1CAIAAAChInrhAAAgAElEQVR4nO3dO3LjutaG4X8Szj0Qxx…