Description There is an old country and the king fell in love with a devil. The devil always asks the king to do some crazy things. Although the king used to be wise and beloved by his people. Now he is just like a boy in love and can't refuse any re…

Problem Description There is an old country and the king fell in love with a devil. The devil always asks the king to do some crazy things. Although the king used to be wise and beloved by his people. Now he is just like a boy in love and can’t refus…

http://www.lydsy.com/JudgeOnline/problem.php?id=3864 题意: 给你一个DNA序列,求有多少个长度为m的DNA序列和给定序列的LCS为0,1,2.... 求LCS方式:f[i][j]=max(f[i-1][j],f[i][j-1],f[i-1][j-1]*(s[i]==t[j])) 固定了i,相邻的j的f[i][j]值最多相差1 dp[i][j] 表示长度为i的DNA序列,将“f[ |S| ][j+1]是否比f[ |S| ][j] 大1” 这个状…

Time Limit: 8 Sec  Memory Limit: 128 MBSubmit: 397  Solved: 206[Submit][Status][Discuss] Description There is an old country and the king fell in love with a devil. The devil always asks the king to do some crazy things. Although the king used to be…

Description There is an old country and the king fell in love with a devil. The devil always asks the king to do some crazy things. Although the king used to be wise and beloved by his people. Now he is just like a boy in love and can’t refuse any re…

[BZOJ3864]Hero meet devil Description There is an old country and the king fell in love with a devil. The devil always asks the king to do some crazy things. Although the king used to be wise and beloved by his people. Now he is just like a boy in lo…

3864: Hero meet devil 题意: 给你一个只由AGCT组成的字符串S (|S| ≤ 15),对于每个0 ≤ .. ≤ |S|,问 有多少个只由AGCT组成的长度为m(1 ≤ m ≤ 1000)的字符串T,使得\(LCS(T,S) = i\)? dp套dp! 通过一个外层的dp来计算使得另一个dp方程(子dp)最终结果为特定值的输入数. 一位一位确定子dp的输入,记录子dp的状态值 子dp: \(d(i,j)\)表示\(LCS(T[1,i],S[1,j])\),对第二维差分,\(…

题目链接 题意: 给n长度的S串,对于0<=i<=|S|,有多少个长度为m的T串,使得LCS(S,T) = i. 思路: 理解的不是很透彻,先占个坑. #include <bits/stdc++.h> const int S = (1 << 15) + 5; const int MOD = 1e9 + 7; char color[] = "ATGC"; char s[20]; int pre[20], lcs[20]; int dp[2][S], a…

题面 给你一个只由\(AGCT\)组成的字符串\(S (|S| ≤ 15)\),对于每个\(0 ≤ .. ≤ |S|\),问 有多少个只由\(AGCT\)组成的长度为\(m(1 ≤ m ≤ 1000)\)的字符串\(T\),使得\(LCS(T,S)=i\)? 题解 老早就听说这个叫做\(dp\ of\ dp\)的神仙了--然而一直没学-- 我们先考虑\(LCS\)是怎么转移的,设\(LCS(i,j)\)表示第一个串到\(i\),第二个串到\(j\)为止的最长公共子序列,那么转移为 \[ LCS(…

bzoj3864次元联通们 第一次写dp of dp (:з」∠) 不能再颓废啦 考虑最长匹配序列匹配书转移 由于dp[i][j]的转移可由上一行dp[i-1][j-1],dp[i-1][j],dp[i][j-1]得来 把dp[i]差分,得到一个01串 就可以用rans[s][ch]表示在状态s的dp数组后面接字符ch可以转移到的状态 枚举该转移就好了QAQ /************************************************************** Probl…