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 ...
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其他好文 时间:
2020-04-15 16:33:01
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90
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 ...
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Web程序 时间:
2020-04-08 19:03:29
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79
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 ...
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其他好文 时间:
2020-04-07 18:17:31
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69
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 ...
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其他好文 时间:
2020-04-07 00:16:06
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70
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, ...
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其他好文 时间:
2020-04-06 17:13:28
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68
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 ...
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其他好文 时间:
2020-04-06 09:59:23
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68
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, ...
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其他好文 时间:
2020-04-06 09:56:48
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80
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 ...
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其他好文 时间:
2020-04-06 00:23:00
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298
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 ...
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其他好文 时间:
2020-04-06 00:21:55
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65
https://www.blue-granite.com/blog/a-different-way-to-process-data-kappa-architecture Kappa architecture proposes an immutable data stream as the prima ...
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移动开发 时间:
2020-04-05 22:03:37
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112