As we can see the first cell holds only the first value in the array, the second cell hold the sum of the first two values and the third cell holds the first three values and so on... Back to the sum query we can now calculate any query in O(1) using this array. For example:...
于是可得sum[i]+=sum[i−1]−dp[0−py]sum[i]+=sum[i−1]−dp[0−py],dp[b[i]−py−b[i]]+=sum[i−]−dp[0−py]dp[b
Codeforces1485F - Copy or Prefix Sum 题目链接 参考题解链接 思路 最基本的dpdp状态转移方程都能推。 dp[i][j]:dp[i][j]:到第ii个数,前缀和为jj的所有方案数。 考虑第aiai的两种选择方式: 1、当ai=biai=bi时,前缀和为jj时: dp[i][j]=dp[i−1][j−bi](−inf≤j≤inf)dp[i][j]=...
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prefix sum, probably an empty one which is equal to000(in another words, if every nonempty prefix sum is less to zero, then it is considered equal to zero). Formally, denote asf(a)f(a)f(a)the maximal prefix sum of an arraya1,…,la_{1, \ldots ,l}a1,…,lof lengthl≥0l...
https://mrsrz.github.io/CF1303G/ mrsrz added Gitalk https://mrsrz.github.io/CF1303G/ labels Sep 27, 2020 Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment Assignees No one assigned Labels Gitalk https://mrsrz.github.io/CF1303G/ ...
输入数据 1 4 4 2 3 2 4 1 1 3 3 7 Copy 输出数据 1 36 Copy Note The best path in the first example is from vertex333to vertex111. It gives the sequence[3,3,7,1][3, 3, 7, 1][3,3,7,1], and the sum of prefix sums is363636....
【CF1303G】Sum of Prefix Sums 题目 题目链接:https://codeforces.com/contest/1303/problem/G 有一颗 \(n\) 个节点的树,树每个节点有一个权值 \(a_i (1 \leq a_i \leq 10^6)\)。 定义树上 \(u \rightarrow v\) 的链的权值如下:将 \(u\) 到 \(v\) 的路径上点的权值依次排列在数组中...
* fix(basic/prefix-sum.md): 增加多维前缀和部分的可读性 * style: format markdown files with remark-lint * fix(basic/prefix-sum): 增加 include 语句 * style: format markdown files with remark-lint * fix(prefix-sum): 添加函数体 * style: format markdown files with remark-lint * fix(pref...