Description In Pearlania everybody is fond of pearls. One company, called The Royal Pearl, produces a lot of jewelry with pearls in it. The Royal Pearl has its name because it delivers to the royal family of Pearlania. But it also produces bracelets…

题目大意:珠宝店有许多珠宝,你需要每种珠宝各买一定的数目,各种珠宝的价格是不一样的,每种珠宝买的时候都必须多付10颗该珠宝的钱,但一种珠宝可以用比它更贵的珠宝来代替,所以有时候用更贵的珠宝来充数可能更省钱.现在问你最少要多少钱?输入数据已按珠宝按价格升序排序. 分析:开始想的时候想了一个二维的方程,但是一维就够了.设f[i]表示买了第i种珠宝,前面的珠宝都已经买了或有更贵的充数,此时所花的最少的钱. 则f[i]=min(f[k]+(sum[i]-sum[k]+10)*price[i]) 设y=f…

题目链接. 题目大意: 给定一个n,和两个序列a[i], p[i]. a[i] 表示需要购买 i品质 的数量,p[i] i 等级的价格. 1.每个品质都会有不同的价格,价格依据品质上升而上升 2.买一次 i 品质,都要加上10个 i 品质 价格的手续费. 3.可一用高品质的代替低品质. 求最少的花费. 分析: 这题就简单地矩阵链乘法(<算法导论>第15章,动态规划). 用 dp[i][j] 表示购买 i 品质到 j 的最少的花费. dp[i][j] = min{dp[i][k]+dp[k+1]…

http://poj.org/problem?id=1260 (题目链接) 题意 购买珍珠,所有珍珠分成n个档次,第i个档次购买每个珍珠的价格为p[i],需要购买第i档次的珍珠a[i]个.若要购买第i组珍珠,则所需要支付的价格为:(a[i]+10)*p[i],也就是说购买每组价格不同的珍珠所需要多支付10个珍珠的价格.可以用档次高的珠宝来替代档次低的珠宝.这样或许可以节省总钱数.而题目就是要求出购买所有数量的珠宝所需支付的最低价格. Solution 决策单调性证明+斜率优化,如果要证明的话,套…

Programming pearls 编程珠玑的题目 这段时间有空都在看编程珠玑,很经典的一本书,一边看一边用 python 做上面的题目,我做的都放到 github 上了 https://github.com/fengyc/programming-pearls-2nd-python. 编程珠玑这书有段历史了,上面有些概念估计现在的学生听都没有听过,像磁带排序.3n+1问题等估计有些人听都没有听过,我花了点时间把相应的东西整理了,性能估算部分是根据现在的计算机速度重新估算了,还挺有意思的. 推荐…

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…

Pearls Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 6670 Accepted: 3248 Description In Pearlania everybody is fond of pearls. One company, called The Royal Pearl, produces a lot of jewelry with pearls in it. The Royal Pearl has its name…

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://poj.org/problem?id=1260 Pearls Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 8474   Accepted: 4236 Description In Pearlania everybody is fond of pearls. One company, called The Royal Pearl, produces a lot of jewelry with pearls…

Pearls Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 7980 Accepted: 3966 Description In Pearlania everybody is fond of pearls. One company, called The Royal Pearl, produces a lot of jewelry with pearls in it. The Royal Pearl has its name…

传说的SB DP: 题目 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 eac…

Game with Pearls Problem DescriptionTom and Jerry are playing a game with tubes and pearls. The rule of the game is:1) Tom and Jerry come up together with a number K.2) Tom provides N tubes. Within each tube, there are several pearls. The number of p…

Educational Codeforces Round 6 C. Pearls in a Row 题意:一个3e5范围的序列:要你分成最多数量的子序列,其中子序列必须是只有两个数相同, 其余的数只能出现一次. 策略: 延伸:这里指的延伸如当发现1-1如果以最后出现重叠的数为右边界则就表示左延伸,若以1.0.1..0第二个0前一个位置作为右边界就为右延伸: 开始时想是右延伸,考虑到可能只出现一组两个数相同,认为向左延伸会出错,但是直接WA了之后,发现这并不是题目的坑点(其实只需将最后一组改成左右…

Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 6647   Accepted: 3241 Description In Pearlania everybody is fond of pearls. One company, called The Royal Pearl, produces a lot of jewelry with pearls in it. The Royal Pearl has its name be…

Pearls Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 2018    Accepted Submission(s): 953 Problem Description In Pearlania everybody is fond of pearls. One company, called The Royal Pearl, pro…

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,…

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 ea…

Paint Pearls 题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5009 dp+双向链表优化 看到题目,很自然地可以定义状态:dp[i]表示涂好a[0...i]的字符串,花费的最小代价. 状态转移方程:dp[i]=min(dp[i],dp[j]+num2),其中num=从a[j]到a[i]不同的数字个数. 时间复杂度为O(n2),对于n=50000的数据,明显会T. 于是,我们需要进行优化.注意到状态数无法化简,考虑优化转移复杂度. 当区间…

Pearls Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 10558   Accepted: 5489 Description In Pearlania everybody is fond of pearls. One company, called The Royal Pearl, produces a lot of jewelry with pearls in it. The Royal Pearl has its…

C. Pearls in a Row time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output There are n pearls in a row. Let's enumerate them with integers from 1 to n from the left to the right. The pearl number…

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…

C. Pearls in a Row There are n pearls in a row. Let's enumerate them with integers from 1 to n from the left to the right. The pearl number i has the type ai. Let's call a sequence of consecutive pearls a segment. Let's call a segment good if it cont…

Game with Pearls Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 1914    Accepted Submission(s): 671 Problem Description Tom and Jerry are playing a game with tubes and pearls. The rule of the…

Description In Pearlania everybody is fond of pearls. One company, called The Royal Pearl, produces a lot of jewelry with pearls in it. The Royal Pearl has its name because it delivers to the royal family of Pearlania. But it also produces bracelets…

Dicripntion 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, he selec…

C. Pearls in a Row time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output There are n pearls in a row. Let's enumerate them with integers from 1 to n from the left to the right. The pearl number …

Paint Pearls 思路: 离散化+dp+剪枝: dp是个n方的做法: 重要就在剪枝: 如果一个长度为n的区间,有大于根号n种颜色,还不如一个一个涂: 来,上代码: #include <cstdio> #include <cstring> #include <iostream> #include <algorithm> using namespace std; #define maxn 50005 int n,ai[maxn],dp[maxn],ls[…

C. Pearls in a Row time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output There are n pearls in a row. Let's enumerate them with integers from 1 to n from the left to the right. The pearl number …

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…

Pearls Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 7210 Accepted: 3543 Description In Pearlania everybody is fond of pearls. One company, called The Royal Pearl, produces a lot of jewelry with pearls in it. The Royal Pearl has its name…