Cake Time Limit: 4 Seconds      Memory Limit: 65536 KB Alice and Bob like eating cake very much. One day, Alice and Bob went to a bakery and bought many cakes. Now we know that they have bought n cakes in the bakery. Both of them like delicious cakes…

动态规划题:dp[i][j]表示有i个Cake,给了Alice j个,先按照b排序,这样的话,能保证每次都能成功给Alice Cake,因为b从大到小排序,所以Alice选了j个之后,Bob最少选了j个,所以i>=2*j, 并且每次Alice选的时候Bob已经选过了.所以当i>=2 * j的时候Alice一定能选. 所以dp[i][j] = max(dp[i - 1][j], dp[i - 1][j - 1] + ary[i].a); dp[i - 1][j]表示Alice不选第i个,dp[i…

Cake Time Limit: 4 Seconds      Memory Limit: 65536 KB Alice and Bob like eating cake very much. One day, Alice and Bob went to a bakery and bought many cakes. Now we know that they have bought n cakes in the bakery. Both of them like delicious cakes…

problemCode=3511" target="_blank" style="">题目链接:zoj 3511 Cake Robbery 题目大意:就是有一个N边形的蛋糕.切M刀,从中挑选一块边数最多的.保证没有两条边重叠. 解题思路:有多少个顶点即为有多少条边,所以直接依照切刀切掉点的个数排序,然后用线段树维护剩下的还有哪些点. #include <cstdio> #include <cstring> #include &…

题意:切一个凸边行,如果不是凸包直接输出.然后输出最小代价的切割费用,把凸包都切割成三角形. 先判断是否是凸包,然后用三角形优化. dp[i][j]=min(dp[i][j],dp[i][k]+dp[k][j]+w[i][k]+w[j][k]); w[i][j]代表i到j点的切割费用. dp[i][j]:表示以i到j点的最小费用.则可把凸边行分成三个部分的费用.两个凸边行(i,k),(k,j)和两条边的费用(i,k),(j,k),k为枚举的三角形顶点. Zoj 3537 Cake (DP_最优三…

Cake Time Limit: 1 Second      Memory Limit: 32768 KB You want to hold a party. Here's a polygon-shaped cake on the table. You'd like to cut the cake into several triangle-shaped parts for the invited comers. You have a knife to cut. The trace of eac…

Cake Time Limit: 1 Second Memory Limit: 32768 KB You want to hold a party. Here's a polygon-shaped cake on the table. You'd like to cut the cake into several triangle-shaped parts for the invited comers. You have a knife to cut. The trace of each cut…

Description You want to hold a party. Here's a polygon-shaped cake on the table. You'd like to cut the cake into several triangle-shaped parts for the invited comers. You have a knife to cut. The trace of each cut is a line segment, whose two endpoin…

这道题目是经典的凸包的最优三角剖分,不过这个题目给的可能不是凸包,所以要提前判定一下是否为凸包,如果是凸包的话才能继续剖分,dp[i][j]表示已经排好序的凸包上的点i->j上被分割成一个个小三角形的最小费用,那么dp[i][j] = min(dp[i][k]+dp[k][j]+cost[i][k]+cost[k][j]),其中,(j >= i+ 3,i+1<=k<=j-1,cost[i][k]为连一条i到k的线的费用). 上一个图,来自博客http://blog.csdn.net…

区间DP. 首先求凸包判断是否为凸多边形. 如果是凸多边形:假设现在要切割连续的一段点,最外面两个一定是要切一刀的,内部怎么切达到最优解就是求子区间最优解,因此可以区间DP. #include<cstdio> #include<cmath> #include<cstring> #include<algorithm> #include<iostream> using namespace std; ; const int INF = 0x7FFFFF…