查看题目 登录后递交 讨论 题解 文件 统计 信息 ID 2354 时间 1000ms 内存 256MiB 难度 (无) 标签 combinatorics dp math *2300 递交数 0 已通过 0 上传者 root
[Codeforces 1228E]Another Filling the Grid (排列组合+容斥原理) 题面 一个$n \times n$的格子,每个格子里可以填$[1,k]$内的整数。要保证每行每列的格子上的数最小值为1,有多少种方案 $n \leq 250,k \leq 10^9$ 分析
然后其他的部分即为kn2+ij−in−jnkn2+ij−in−jn 同时配上一个容斥系数)−)i+j 容斥系数这里可以打表找规律 具体的求容斥系数可以参照一道例题 然后此时已经可以过了,但是我们有更好的方法 ∑i=0∑j=0(−1)i+jCinCjn(k−1)in+jn−ijkn2+ij−in−jn∑i=0∑j=0(−1)i+jCinCjn...
CF1228E Another Filling the Grid 博主: tony102 发布时间:2021 年 10 月 07 日 1740 次浏览 暂无评论 779字数 分类: 题解首页 正文 分享到: Link Sol 容斥练习题。其实跟 【JSOI2015】染色问题 差不多,异曲同工之妙。可以先看看那道题。 枚举有多少行没有填 1,假设有 i 行,那么这 i 行填数字的...
E. Another Filling the Grid 参考:Codeforces Round #589 (Div. 2)-E. Another Filling the Grid-容斥定理 容斥这个东西可以理解,但是运用到实际的时候,还是觉得有点迷迷糊糊的,不知道套公式会不会是一种可行的办法。 是时候也得把以前的知识温习一下了... 具体...
Codeforces 1228E. Another Filling the Grid,传送门看到$n=250$显然考虑$n^3$的$dp$设$f[i][j]$表示填完前$i$行,目前有$j$列的最小值是$1$的合法方案数那么对于$f[i][j]$,枚举$f[i-1][k]$,有$f[i][j]=\sum_{k=0}^{j}\binom{n-k
Some depression cells with heights lower than their surrounding cells may often be found in Grid-based digital elevation models (DEM) dataset due to sampling errors. The depression-filling algorithm presented by Planchon and Darboux works very quickly compared to other published methods. Despite its ...
(2009) Another fast and simple dem depression-filling algorithm based on priority queue structure, Atmospheric and Oceanic Science Letters 2.LIU Yong-He, ZHANG Wan-Chang, and XU Jing-Wen-" Another Fast and Simple DEM Depression-Filling Algorithm Based on Priority Queue Structure", Atmospheric and...
The Hilbert curve is a fractal space-filling curve that representsa challenging test case for the labeling algorithms.Samples of the YACCLAB 3D datasets. From left to right we have the Hilbert space-filling curve, the OASIS dataset and Mitochondria medical imaging data....
(hard to see) small motifs filling problem spaces, worked in black. There are LOTS of mistakes in this. Places I missed a stitch, or substituted the wrong twist or size center flower, but since this is a quick stitch, meant to be worn to death and not a future heirloom of my house...