Paint Pearls Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 3239    Accepted Submission(s): 1052 Problem Description Lee has a string of n pearls. In the beginning, all the pearls have no color…

Paint Pearls Problem Description   Lee has a string of n pearls. In the beginning, all the pearls have no color. He plans to color the pearls to make it more fascinating. He drew his ideal pattern of the string on a paper and asks for your help. In e…

http://acm.hdu.edu.cn/showproblem.php?pid=5009 2014网络赛 西安 比较难的题 Paint Pearls Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 1951    Accepted Submission(s): 631 Problem Description Lee has a str…

这个题目数据量很小,但是满足斜率优化的条件,可以用斜率优化dp来做. 要注意的地方,0也是一个决策点. #include <iostream> #include <cstdio> #include <cstring> using namespace std; const int maxn=1e2+9; int dp[maxn]; int a[maxn],p[maxn],sum[maxn]; int que[maxn]; bool chk1(int i,int j,int…

http://acm.hdu.edu.cn/showproblem.php?pid=5009 题目要求对空序列染成目标颜色序列,对一段序列染色的成本是不同颜色数的平方. 这题我们显然会首先想到用DP去解决,dp[i] = min( dp[i] , dp[j] + cost(i , j) ).但是枚举ij的复杂的高达n^2,不能接受,我们就考虑去优化它. 首先比较容易想到的是,去除连续重复元素,可以把它们当作同一个点处理. 此外在遍历j的过程中如果当前序列颜色不同的数量平方大于当前dp[i],显然…

题目链接:https://vjudge.net/problem/HDU-1300 Pearls Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 2920    Accepted Submission(s): 1464 Problem Description In Pearlania everybody is fond of pearls.…

原题连接:http://acm.hdu.edu.cn/showproblem.php?pid=1300 题意: 题目太长了..自己看吧 题解: 看懂题目,就会发现这是个傻逼dp题,斜率优化一下就好 代码: #include<iostream> #include<cstring> #include<vector> #include<cstdio> #define MAX_N 500 using namespace std; typedef long long…

题目链接:https://cn.vjudge.net/problem/HDU-5009 题意 给一串序列,可以任意分割多次序列,每次分割的代价是被分割区间中的数字种数. 求分割区间的最小代价.n<=5e4 例:1 3 3 答:2 思路 今天刚讲的dp题目,这次讲课收益非常,写个题解. 状态和转移是dp[i]=min(dp[j]+cnt[j-1][i]^2) 会发现这样绝对超时,又发现这里的j可以贪心的跳着选择(因为种数相同时,左端点应越小越好). 这里的跳着选择想了半天没什么思路,又是最后看了题…

Problem Description Lee has a string of n pearls. In the beginning, all the pearls have no color. He plans to color the pearls to make it more fascinating. He drew his ideal pattern of the string on a paper and asks for your help.  In each operation,…

转自:http://blog.csdn.net/accelerator_/article/details/39271751 吐血ac... 11668627 2014-09-16 22:15:24 Accepted 5009 1265MS 1980K 2290 B G++ czy   Paint Pearls Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Subm…