HDU 1081:To The Max】的更多相关文章

To The Max Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 10747    Accepted Submission(s): 5149 Problem Description Given a two-dimensional array of positive and negative integers, a sub-recta…
HDU 1081 题意:给定二维矩阵,求数组的子矩阵的元素和最大是多少. 题解:这个相当于求最大连续子序列和的加强版,把一维变成了二维. 先看看一维怎么办的: int getsum() { ; int ans=-1e9; ;i<=n;i++){ ) tot=; tot+=a[i]; if(tot>ans) ans=tot; } return ans; } 这种做法太棒了!短短几行,就能解决最大子序列和这个问题.其实这几行代码值得深思.而且这是个在线算法,输入数据及时能给出结果,感觉不能归于动归…
链接:HDU - 6409:没有兄弟的舞会 题意: 题解: 求出最大的 l[i] 的最大值 L 和 r[i] 的最大值 R,那么 h 一定在 [L, R] 中.枚举每一个最大值,那么每一个区间的对于答案的贡献就是一个等差数列的和(乘法分配律),将每一个和乘起来就是该最大值的对于答案的贡献.但是相同最大值可能来自于多个区间,如果枚举每一个可能出现最大值的区间,那么会超时,所以需要一个神奇的方法,我也不知道原理是什么,但是数学上就是直接的式子,可以分解出来. #include <bits/stdc+…
免费馅饼 Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 62694    Accepted Submission(s): 21961 Problem Description 都说天上不会掉馅饼,但有一天gameboy正走在回家的小径上,忽然天上掉下大把大把的馅饼.说来gameboy的人品实在是太好了,这馅饼别处都不掉,就掉落在他身旁的…
http://poj.org/problem?id=3321 http://acm.hdu.edu.cn/showproblem.php?pid=3887 POJ 3321: 题意:给出一棵根节点为1的边不一定的树,然后给出问题:询问区间和 或者 节点值更新. HDU 3887: 题意:和POJ 3321的题意差不多,只不过对每个节点询问不包含该节点的区间和 思路:今天才学了下才知道有DFS序这种东西,加上树状数组处理一下区间和 和 节点更新. DFS序大概就是我们在DFS遍历一棵树的时候,在进…
<!DOCTYPE html> <html> <head> <!-- 页面上有3个输入框:分别为max,min,num:三个按钮:分别为生成,排序,去重: 在输入框输入三个数字后,先点击生成按钮,生成一个数组长度为num,值为max到min 之间的随机整数:点击排序,对当前数组进行排序,点击去重,对当前数组进行去重. 每次点击之后使结果显示在控制台 --> <meta charset="utf-8"> <title>…
题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=1081 http://acm.xmu.edu.cn/JudgeOnline/problem.php?id=1031 题目大意: 给一个n*n(n<=100)的矩阵,求一个矩形覆盖的值最大是多少. 题目思路: [动态规划] 二维的最大字段和.先考虑一维的情况.f[i]=max(f[i-1]+a[i],a[i]) 只要之前的部分和大于零则一起取一定比只取当前位置的要优. 因此只要判断局部段的和是否大于零…
链接: http://acm.hdu.edu.cn/showproblem.php?pid=1081 这道题使用到的算法是:预处理+最大连续子串和 如果会做最大连续子串和,那么理解这题就相对简单一些,若不知道最大连续子串和,建议先看一下这两题: http://acm.hdu.edu.cn/showproblem.php?pid=1003 http://www.cnblogs.com/YY56/p/4855766.html To The Max Time Limit: 2000/1000 MS (…
题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1081 To The Max Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 8839    Accepted Submission(s): 4281 Problem Description Given a two-dimensional ar…
To The Max Problem's Link: http://acm.hdu.edu.cn/showproblem.php?pid=1081 Mean: 求N*N数字矩阵的最大子矩阵和. analyse: 乍看题目意思很简单,但对于刚开始学DP的新手来说也不是很简单. 这道题使用到的算法是:预处理+最大连续子串和 如果会做最大连续子串和,那么理解这题就相对简单一些,若不知道最大连续子串和,建议先看一下这两题: http://acm.hdu.edu.cn/showproblem.php?pi…
http://acm.hdu.edu.cn/showproblem.php?pid=1024 Max Sum Plus Plus Problem Description Now I think you have got an AC in Ignatius.L's "Max Sum" problem. To be a brave ACMer, we always challenge ourselves to more difficult problems. Now you are fac…
点我看题目 题意 : 给你一个n*n的矩阵,让你找一个子矩阵要求和最大. 思路 : 这个题都看了好多天了,一直不会做,今天娅楠美女给讲了,要转化成一维的,也就是说每一列存的是前几列的和,也就是说 0 -2 -7 0 9 2 -6 2-4 1 -4 1-1 8 0 -2 处理后就是:0  -2  -9  -99   11  5   7-4 -3  -7  -6-1  7   7   5 #include <iostream> #include <stdio.h> #include &…
题目链接 Problem Description Given a two-dimensional array of positive and negative integers, a sub-rectangle is any contiguous sub-array of size 1 x 1 or greater located within the whole array. The sum of a rectangle is the sum of all the elements in th…
 To The Max Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 10839    Accepted Submission(s): 5191 Problem Description Given a two-dimensional array of positive and negative integers, a sub-re…
Max Sum Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 292444    Accepted Submission(s): 69379 Problem Description Given a sequence a[1],a[2],a[3]......a[n], your job is to calculate the max s…
Max Sum Plus Plus Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 36673    Accepted Submission(s): 13069 Problem Description Now I think you have got an AC in Ignatius.L's "Max Sum" proble…
题目链接 Problem Description Given a two-dimensional array of positive and negative integers, a sub-rectangle is any contiguous sub-array of size 1 x 1 or greater located within the whole array. The sum of a rectangle is the sum of all the elements in th…
转载请注明出处:http://blog.csdn.net/u012860063 Description Given a two-dimensional array of positive and negative integers, a sub-rectangle is any contiguous sub-array of size 1*1 or greater located within the whole array. The sum of a rectangle is the sum…
Description Given a two-dimensional array of positive and negative integers, a sub-rectangle is any contiguous sub-array of size 1*1 or greater located within the whole array. The sum of a rectangle is the sum of all the elements in that rectangle. I…
题目链接 题意:给你一个n*n矩阵,求这个矩阵的最大子矩阵和 #include<iostream> #include<cstdio> #include<string.h> using namespace std; #define inf -0x3f3f3f3f int field[105][105],dp[105]; int main() { int n; while(~scanf("%d",&n)) { int maxn=0; memset…
Max Sum Plus Plus Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 21336    Accepted Submission(s): 7130 Problem Description Now I think you have got an AC in Ignatius.L's "Max Sum" problem…
Max Sum Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 174588    Accepted Submission(s): 40639 Problem Description Given a sequence a[1],a[2],a[3]......a[n], your job is to calculate the max s…
To The Max Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 7620    Accepted Submission(s): 3692 Problem Description Given a two-dimensional array of positive and negative integers, a sub-rectang…
Problem Description Given a two-dimensional array of positive and negative integers, a sub-rectangle is any contiguous sub-array of size 1 x 1 or greater located within the whole array. The sum of a rectangle is the sum of all the elements in that re…
传送门 题目大意: 求一个矩阵的最大子矩阵和. 题目分析: 刚开始考虑了一下dp方程的递推,但是不好转.简便的方法是预处理sum[i][j]表示第i行的前j个元素之和,之后\(n^3\)枚举子矩阵就可以了. code #include<iostream> #include<cstdio> #include<cstdlib> #include<cstring> #include<string> #include<algorithm> #…
题目:http://acm.hdu.edu.cn/showproblem.php?pid=1081 自己真够垃圾的,明明做过一维的这种题,但遇到二维的这种题目,竟然不会了,我也是服了(ps:猪啊). 最终还是看了题解. 代码如下: #include <iostream> #include <stdio.h> #include <string.h> #include <algorithm> #define inf 0x3f3f3f3f using namesp…
http://acm.hdu.edu.cn/showproblem.php?pid=5968 题意:中文题意. 思路:一开始不会做,后来发现数据范围很小,而且那个数要是连续的,所以可能把所有情况枚举出来很小吧.打了个表发现 100 只有 4950 个,然后直接暴力枚举每一种情况,放在Hash里面标记是否出现过这个数,再弄一个len数组放置每一种情况长度,然后对答案分别向左和向右找最长的长度就好了. #include <cstdio> #include <cstring> #incl…
http://acm.hdu.edu.cn/showproblem.php?pid=4635 题意:给出n个点和m条边,问最多能添加几条边使得图不是一个强连通图.如果一开始强连通就-1.思路:把图分成x个强连通分量之后,每个强连通分量最大的边数是n*(n-1),然后考虑和其他强连通分量相连的情况:即把分量a的所有点都连向分量b的所有点,而b不连a,这样就可以让图不是强连通的.可以把整个图分成两个强连通分量a和b分别有i和j个点,其中i+j=n,那么答案就是n*(n-1)-m-i*j.所以求出最小…
http://acm.hdu.edu.cn/showproblem.php?pid=2767 题意:给出n个点m条边,问在m条边的基础上,最小再添加多少条边可以让图变成强连通.思路:强连通分量缩点后找入度为0和出度为0的点,因为在强连通图里面没有一个点的入度和出度都为0,所以取出度为0的点和入度为0的点中的最大值就是答案.(要特判强连通分量数为1的情况) #include <cstdio> #include <algorithm> #include <iostream>…
http://acm.split.hdu.edu.cn/showproblem.php?pid=2196 Computer     Description A school bought the first computer some time ago(so this computer's id is 1). During the recent years the school bought N-1 new computers. Each new computer was connected t…