---恢复内容开始--- http://poj.org/problem?id=2479 #include <stdio.h> #include <iostream> using namespace std; ],righ[]; int main() { ]; scanf("%d",&t); while(t--) { scanf("%d",&n); ;i<n;i++) scanf("%d",&a…

题目链接:http://poj.org/problem?id=2479 #include<cstdio> #include<cstring> #include<iostream> #include<algorithm> using namespace std; ; const int INF = 0x3f3f3f3f; int dp1[maxn]; int dp2[maxn]; int a[maxn]; int N; int main() { int T;…

题目链接:http://poj.org/problem?id=2479 解题报告: 1.再求left[i]的时候,先没有考虑a[i]的正负,先把a[i]放到left[i]中,然后left=max(left[i-1],left[i]); 2.res=max(res,left[i-1]+right[i]); #include <stdio.h> #include <algorithm> using namespace std; #define MAX 50005 int a[MAX];…

求一个区间内连续两段不相交区间最大和. // File Name: 2479.cpp // Author: Missa_Chen // Created Time: 2013年06月22日 星期六 16时19分02秒 #include <iostream> #include <string> #include <algorithm> #include <cstdio> #include <cstring> #include <cmath>…

Maximum sum Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 40596   Accepted: 12663 Description Given a set of n integers: A={a1, a2,..., an}, we define a function d(A) as below: Your task is to calculate d(A). Input The input consists o…

Maximum sum Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 30704   Accepted: 9408 Description Given a set of n integers: A={a1, a2,..., an}, we define a function d(A) as below: Your task is to calculate d(A). Input The input consists of…

d(A) = max{sum(a[s1]..a[t1]) + sum(a[s2]..a[t2]) | 1<=s1<=t1<s2<=t2<=n} 即求两个子序列和的和的最大值. 为单个区间子序列和的最大值的变形. 左边的从左向右扫描,而右边的从右向左扫描即可. #include<cstdio> #include<algorithm> using namespace std; const int MAXN=50000+10; int left[MAXN],…

题意:给一段数列,将这个数列分成两部分,使两部分的最大子段和的和最大,输出和 /* 看数据没想到是(O)n的算法,求出从前向后的最大子段和和从后向前的最大子段和, 然后枚举断点. 第一次提交不小心折在数组最小值的赋值上-- */ #include<cstdio> #include<iostream> #include<cstring> #define M 50010 #define INF 1000000000 using namespace std; int a[M]…

Hi, I'm back. This is a realy classic DP problem to code. 1. You have to be crystal clear about what you are going to solve.2. Apparently there are 2 DP sections3. Think carefully about recurrence relations5. Details: take care of indices boundaries…

Maximum sum Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 38079   Accepted: 11904 Description Given a set of n integers: A={a1, a2,..., an}, we define a function d(A) as below: Your task is to calculate d(A). Input The input consists o…

题目意思还是很好理解的,在一个数列中,找出不相交的两个子串使得其和最大. 解题思路: 对于每个i来说,求出[0 ~ i - 1] 的最大子段和以及［i ~ n - 1］的最大子段和,在加起来,求最大的一个就行了. ［0 ~ i - 1］的最大子段和从左向右扫描,[i ~ n - 1] 的最大子段和从右向左扫描即可.时间复杂度为 O(n) source code: //#pragma comment(linker, "/STACK:16777216") //for c++ Compile…

Maximum sum Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 44459   Accepted: 13794 Description Given a set of n integers: A={a1, a2,..., an}, we define a function d(A) as below: Your task is to calculate d(A). Input The input consists o…

转自 CSND 想看更多的解题报告: http://blog.csdn.net/wangjian8006/article/details/7870410                                      转载请注明出处:http://blog.csdn.net/wangjian8006 题目大意: 对于连续的整数和的串s1和s2,s1与s2不相交,使得s1+s2最大 解题方法: DP.  lt[i]代表以第i个元素结尾的串最大值  rt[i]代表以第i个元素开头的串的最大…

Maximum sum Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 36100   Accepted: 11213 Description Given a set of n integers: A={a1, a2,..., an}, we define a function d(A) as below: tex=d%28A%29%3D%5Cmax_%7B1%5Cleq+s_1%5Cleq+t_1%3Cs_2%5Cleq…

 题意:给定n个数,求两段连续不重叠子段的最大和. 思路非常easy.把原串划为两段.求两段的连续最大子串和之和,这里要先预处理一下,用lmax数组表示1到i的最大连续子串和,用rmax数组表示n到i的最大连续子串和,这样将时间复杂度降为O(n). #include<cstdio> #include<cstring> #include<cmath> #include<cstdlib> #include<iostream> #include&l…

题目大意: 在一组数中,找到连续的两段 , 是这两段相加和达到最大 这里利用dp[2][N]的数组保存所有的状态 dp[0][i]表示取到第i个数时只取了一段的最大和,第i个数是一定要被取到的 dp[1][i]表示取到第i个数时取了2段的最大和,第i个数是一定要被取到的 而题目所求答案就是所有dp[1][i]中的最大值 状态转移方程: dp[0][i] = max{dp[0][i-1]+a[i] , a[i]} dp[1][i] = max{dp[0][j]+a[i] , dp[1][i-1]+…

动态规划与贪心相关: {HDU}{4739}{Zhuge Liang's Mines}{压缩DP} 题意:给定20个点坐标,求最多有多少个不相交(点也不相交)的正方形 思路:背包问题,求出所有的正方形,然后求最多有多少个正方形不互相覆盖,这题真是神思路. {POJ}{3846}{Mountain Road} 题意:给定两个地点车的班次,路是双向单车道,求安排最短的时间 思路:对车次序列进行二维DP转移,转移的时候需要注意时刻的维护.这个题目的DP思路是正向DP,每次遍历到f[i][j]都需要更新…

题目链接:http://poj.org/problem?id=2593 思路分析:该问题为求给定由N个整数组成的序列,要求确定序列A的2个不相交子段,使这m个子段的最大连续子段和的和最大. 该问题与poj 2479相同,解法也一样: 代码如下: #include <cstdio> #include <iostream> using namespace std; + ; int arr[MAX_N], dp_s[MAX_N], dp_r[MAX_N]; int arr_num; in…

1.TreeMap和TreeSet类:A - Language of FatMouse ZOJ1109B - For Fans of Statistics URAL 1613 C - Hardwood Species POJ 2418D - StationE - Web Navigation ZOJ 1061F - Argus ZOJ 2212G - Plug-in2.SegmentTreeA-敌兵布阵 hdu 1166B - I Hate It HDU 1754C - A Simple Pro…

感觉动态规划非常模糊,怎么办呢??? 狂刷题吧!! !! ! !!! ! !!! !! ! ! ! .!! ..!.! PKU  PPt 动规解题的一般思路 1. 将原问题分解为子问题                 把原问题分解为若干个子问题,子问题和原问题形式同样或类似.仅仅只是规模变小了. 子问题都解决,原问题即解 决(数字三角形例).             子问题的解一旦求出就会被保存,所以每一个子问题仅仅需求解一次. 2. 确定状态            在用动态规划解题时,我们往往…

A - Maximum sum Time Limit:1000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Submit cid=84333#status//A/0" class="ui-button ui-widget ui-state-default ui-corner-all ui-button-text-only" style="display:inline-block;…

Max Sequence Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 16329   Accepted: 6848 Description Give you N integers a1, a2 ... aN (|ai| <=1000, 1 <= i <= N). You should output S.  Input The input will consist of several test cases. F…

更新中... http://poj.org/problem?id=1037 dp[i][j][0]表示序列长度为i,以j开始并且前两位下降的合法序列数目; dp[i][j][1]表示序列长度为i, 以j开始并且前两位上升的合法序列数目; 于是我们可以得到递推方程式:dp[i][j][0] += dp[i-1][k][1] ( 1 <= k < j ), dp[i][j][1] += dp[i-1][k][0] ( k <= j <= i), 然后我们就可以从第一位开始枚举了. ht…

此文来自北京邮电大学ACM-ICPC集训队 此50题在本博客均有代码,可以在左侧的搜索框中搜索题号查看代码. 以下是原文: POJ推荐50题1.标记“难”和“稍难”的题目可以看看,思考一下,不做要求,当然有能力的同学可以直接切掉.2.标记为A and B的题目是比较相似的题目,建议大家两个一起做,可以对比总结,且二者算作一个题目.3.列表中大约有70个题目.大家选做其中的50道,且每类题目有最低数量限制.4.这里不少题目在BUPT ACM FTP上面都有代码,请大家合理利用资源.5.50个题目要…

Max Sequence Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 17678   Accepted: 7401 Description Give you N integers a1, a2 ... aN (|ai| <=1000, 1 <= i <= N).  You should output S.  Input The input will consist of several test cases.…

以下是poj百道水题,新手可以考虑从这里刷起 搜索1002 Fire Net1004 Anagrams by Stack1005 Jugs1008 Gnome Tetravex1091 Knight Moves1101 Gamblers1204 Additive equations 1221 Risk1230 Legendary Pokemon1249 Pushing Boxes 1364 Machine Schedule1368 BOAT1406 Jungle Roads1411 Annive…

Halloween treats Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 7644   Accepted: 2798   Special Judge Description Every year there is the same problem at Halloween: Each neighbour is only willing to give a certain total number of sweets…

Find a multiple Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 7192   Accepted: 3138   Special Judge Description The input contains N natural (i.e. positive integer) numbers ( N <= 10000 ). Each of that numbers is not greater than 15000…

The Pilots Brothers' refrigerator Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 22286   Accepted: 8603   Special Judge Description The game “The Pilots Brothers: following the stripy elephant” has a quest where a player needs to open a…

Flip Game Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 37427   Accepted: 16288 Description Flip game is played on a rectangular 4x4 field with two-sided pieces placed on each of its 16 squares. One side of each piece is white and the…