题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5492 题目大意是有一个矩阵,从左上角走到右下角,每次能向右或者向下,把经过的数字记下来,找出一条路径是这些数的方差最小. Find a path Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 961    Accepted Submissi…

Man Down Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2030    Accepted Submission(s): 743 Problem Description The Game “Man Down 100 floors” is an famous and interesting game.You can enjoy t…

给出点集,和不大于L长的绳子,问能包裹住的最多点数. 考虑每个点都作为左下角的起点跑一遍极角序求凸包,求的过程中用DP记录当前以j为当前末端为结束的的最小长度,其中一维作为背包的是凸包内侧点的数量.也就是 dp[j][k]代表当前链末端为j,其内部点包括边界数量为k的最小长度.这样最后得到的一定是最优的凸包. 然后就是要注意要dp[j][k]的值不能超过L,每跑一次凸包,求个最大的点数量就好了. 和DP结合的计算几何题,主要考虑DP怎么搞 /** @Date : 2017-09-27 17:27…

HDU 5492 Find a path 题意:给你一个矩阵求一个路径使得 最小. 思路: 方法一:数据特别小,直接枚举权值和(n + m - 1) * aver,更新答案. 方法二:用f[i][j][k]表示到达[i,j]是权值和为k时平方和的最大值,转移方程就是 f[i][j][k] = min(f[i][j][k], min(f[i - 1][j][k - a[i][j]] + sqr(a[i][j]), f[i][j - 1][k - a[i][j]] + sqr(a[i][j])));…

题意: 给出一个n*m的地图,要求从左上角(0, 0)走到右下角(n-1, m-1). 地图中每个格子中有一个值.然后根据这些值求出一个最小值. 这个最小值要这么求—— 这是我们从起点走到终点的路径,其中N是地图的长,M是地图的宽,Ai表示路径中第i个点的值,Aavg表示路径中所有的点的值的平均值.要求这个式子的值最小. 我们可以将它转化为 好了,推到这里,我们需要的数学知识就结束了(实际上以我的数学知识也只能做到这里了……).然后dp就好了—— Dp[i][j][k],i表示第i行,j表示第j…

Find a path Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2116    Accepted Submission(s): 909 Problem Description Frog fell into a maze. This maze is a rectangle containing N rows and M column…

Find a path Frog fell into a maze. This maze is a rectangle containing NN rows and MM columns. Each grid in this maze contains a number, which is called the magic value. Frog now stays at grid (1, 1), and he wants to go to grid (N, M). For each step,…

Find a path Time Limit: 1000ms Memory Limit: 32768KB This problem will be judged on HDU. Original ID: 549264-bit integer IO format: %I64d      Java class name: Main Frog fell into a maze. This maze is a rectangle containing N rows and M columns. Each…

B - Monkey and Banana Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Submit Status Practice HDU 1069 Appoint description: Description A group of researchers are designing an experiment to test the IQ of a monkey. They wi…

G - FatMouse's Speed Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Submit Status Practice HDU 1160 Appoint description: Description FatMouse believes that the fatter a mouse is, the faster it runs. To disprove this, you…