P9648 的小数据，d
Recall the definition of a trie:
A trie of size
�
n is a rooted tree with
�
n vertices and
(
�
−
1
)
(n−1) edges, where each edge is marked with a character;
Each vertex in a trie represents a string. Let
�
(
�
)
s(x) be the string vertex
�
x represents;
The root of the trie represents an empty string. Let vertex
�
u be the parent of vertex
�
v, and let
�
c be the character marked on the edge connecting vertex
�
u and
�
v, we have
�
(
�
)
s(v) =
�
(
�
)
+
�
s(u)+c. Here
+
+ indicat
https://www.luogu.com.cn/problem/solution/P8595
https://www.luogu.com.cn/problem/P8595
https://www.luogu.com.cn/problem/P8595
https://www.luogu.com.cn/problem/P8595
https://www.luogu.com.cn/problem/P8595
https://www.luogu.com.cn/problem/P8595
https://www.luogu.com.cn/problem/P8595
https://www.luogu.com.cn/problem/P8595
https://www.luogu.com.cn/problem/P8595
https://www.luogu.com.cn/problem/P8595
https://www.luogu.com.cn/problem/P8595
https://www.luogu.com.cn/problem/P8595
https://www.luogu.com.cn/problem/P8595
https://www.luogu.com.cn/problem
SP27683 题解 sp
Every tourist visiting our city must visit the May 4 avenue. There are N houses, numbered from 1 to N. There are P _{i}
i
people living at house i.
The statistic institute is procedding with the survey this year. They will make many queries about the avenue's population. For each query, two numbers A and B, with A <= B, are given. You must determine the total number of people living in all houses from house A to house B, inclusive.
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c++ abc159f AC 代码
c++ abc159f AC 代码，适合经常写atcoder的人进行访问。同时，这也有助于你学习c++，你也可以拿此数据进行调试、对拍，找出你的错误。
Given are a sequence of N integers A
1
, A
2
, …, A
N
and a positive integer S.
For a pair of integers (L,R) such that 1≤L≤R≤N, let us define f(L,R) as follows:
f(L,R) is the number of sequences of integers (x
1
,x
2
,…,x
k
) such that L≤x
1
<x
2
<⋯<x
k
≤R and A
x
1
+A
x
2
+⋯+A
x
k
=S.
Find the sum of f(L,R) over all pairs of integers (L,R) such that 1≤L≤R
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