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解题报告: CF2B
题目链接: "CF2B The least round way" 显然需要 $dp$ 解决。 第一个思路:用 $dp_{i}{j}$代表第 $i$ 行第 $j$ 列最小的后缀 $0$ 数,不幸的是,他被 hack 了。 考虑 $10$的形成,贡献只来自于 $2$ 和 $5$ 这个因数。 我们容易想到 ...
分类:其他好文   时间:2020-04-15 16:33:01    阅读次数:90
在php中判断一个字符串包含另一个字符串
方法一:用php的strpos() 函数判断字符串中是否包含某字符串的方法 if(strpos('Longway','way') !== false){ echo '包含way'; }else{ echo '不包含way'; } 方法二:使用了explode 用explode进行判断PHP判断字符串 ...
分类:Web程序   时间:2020-04-08 19:03:29    阅读次数:79
FarmCraft 树形dp
题目描述 In a village called Byteville, there are houses connected with N-1 roads. For each pair of houses, there is a unique way to get from one to anoth ...
分类:其他好文   时间:2020-04-07 18:17:31    阅读次数:69
P3574 FAR-FarmCraft 题解
题目描述 In a village called Byteville, there are $n$ houses connected with $n 1$ roads. For each pair of houses, there is a unique way to get from one to ...
分类:其他好文   时间:2020-04-07 00:16:06    阅读次数:70
【反转开灯问题】Face The Right Way
题目 Farmer John has arranged his N (1 ≤ N ≤ 5,000) cows in a row and many of them are facing forward, like good cows. Some of them are facing backward, ...
分类:其他好文   时间:2020-04-06 17:13:28    阅读次数:68
Face The Right Way思维。。。
题目再次链接 题意: 已知01序列a,求通过对长度为k的序列取反能使序列全部变为1的k的最大值,及此时的最少取反次数。 分析: 首先,先想一想怎么暴力吧。这样想:要保证最小,那么必然不会对同一个区间反转两次,而在k一定时,则不会以同一个数为起点反转两次,于是我们有如果第一个数是0,则反转,是1,则不 ...
分类:其他好文   时间:2020-04-06 09:59:23    阅读次数:68
【反转开灯问题】Face The Right Way
题目 Farmer John has arranged his N (1 ≤ N ≤ 5,000) cows in a row and many of them are facing forward, like good cows. Some of them are facing backward, ...
分类:其他好文   时间:2020-04-06 09:56:48    阅读次数:80
POJ3276 Face The Right Way (尺取法)
题目描述 Farmer John has arranged his N (1 ≤ N ≤ 5,000) cows in a row and many of them are facing forward, like good cows. Some of them are facing backwar ...
分类:其他好文   时间:2020-04-06 00:23:00    阅读次数:298
1086 Tree Traversals Again
An inorder binary tree traversal can be implemented in a non-recursive way with a stack. For example, suppose that when a 6-node binary tree (with the ...
分类:其他好文   时间:2020-04-06 00:21:55    阅读次数:65
Kappa Architecture: A Different Way to Process Data
https://www.blue-granite.com/blog/a-different-way-to-process-data-kappa-architecture Kappa architecture proposes an immutable data stream as the prima ...
分类:移动开发   时间:2020-04-05 22:03:37    阅读次数:112
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