题目地址:Ural 2018 简单DP.用滚动数组. 代码例如以下: #include <iostream> #include <cstdio> #include <string> #include <cstring> #include <stdlib.h> #include <math.h> #include <ctype.h> #include <queue> #include <map> #i…

2018. The Debut Album Time limit: 2.0 secondMemory limit: 64 MB Pop-group “Pink elephant” entered on recording their debut album. In fact they have only two songs: “My love” and “I miss you”, but each of them has a large number of remixes. The produc…

题目链接 题意 : 定义Threeprime为它的任意连续3位上的数字,都构成一个3位的质数. 求对于一个n位数,存在多少个Threeprime数. 思路 : 记录[100, 999]范围内所有素数(标记的是该素数的每一位x1,x2,x3).然后从n = 4往后,定义dp[i][x2][x3],  i 表示到第 i 位时,第 i-1 位为 x2 , 第 i 位x3,此时所包含的情况数. dp[i][x2][x3] = dp[i][x2][x3] + dp[i-1][x1][x2]:最后求和sum…

Given a 2-dimensional array of positive and negative integers, find the sub-rectangle with the largest sum. The sum of a rectangle is the sum of all the elements in that rectangle. In this problem the sub-rectangle with the largest sum is referred to…

题目地址:Ural 1073 DP水题.也能够说是背包. #include <iostream> #include <cstdio> #include <string> #include <cstring> #include <stdlib.h> #include <math.h> #include <ctype.h> #include <queue> #include <map> #include…

题目链接 题意 : 给你一串由括号组成的串,让你添加最少的括号使该串匹配. 思路 : 黑书上的DP.dp[i][j] = min{dp[i+1][j-1] (sh[i] == sh[j]),dp[i][k]+dp[k+1][j](i<=k<j)}.输出的时候递归,其实我觉得输出比dp部分难多了..... #include <stdio.h> #include <string.h> #include <iostream> using namespace std…

题目链接 题意 :农夫每天都会放马出去,然后晚上把马赶入马厩,于是让马排成一行入马厩,但是不想马走更多的路,所以让前p1匹入第一个马厩,p2匹马入第二个马厩…………但是他不想让他的任何一个马厩空着,所有的马都必须入马厩.有两种颜色的马,如果 i 匹黑马与 j 匹白马同在一个马厩,不愉快系数是 i * j,总系数就是k个系数相加.让总系数最小. 思路 : dp[i][j] 代表的是前 i 个马厩放 j 匹马的最小不愉快系数值. #include <cstdio> #include <cst…

题目链接 题意 :这个人要投资地,每块地都是正方形并且边长都是整数,他希望他要买的地尽量的少碎块.每买一块地要付的钱是边长的平方,而且会得到一个一份证书,给你一个钱数,让你求出能得到的证书个数. 思路 :其实就是求x12+x22+……+Xn2中的最小的n. #include <stdio.h> #include <iostream> #include <math.h> using namespace std ; ] ; void dp() { ; i <= ; i…

LightOJ 1033  Generating Palindromes(dp) 题目链接:http://acm.hust.edu.cn/vjudge/contest/view.action?cid=87730#problem/A 题目: Description By definition palindrome is a string which is not changed when reversed. "MADAM" is a nice example of palindrome.…

lightOJ 1047   Neighbor House (DP) 题目链接:http://acm.hust.edu.cn/vjudge/contest/view.action?cid=87730#problem/C 题目: Description The people of Mohammadpur have decided to paint each of their houses red, green, or blue. They've also decided that no two n…