[SPOJ1716] GSS3 - Can you answer these queries III

【[SPOJ1716] GSS3 - Can you answer these queries III】的更多相关文章

[SPOJ1716] GSS3 - Can you answer these queries III

线段树操作. 维护一个区间最大连续子段和,左最大连续子段和,右最大连续子段和即可. 最后不知道怎么搞,query的时候返回了个结构体. #include <cstdio> #include <cstring> #include <iostream> using namespace std; const int N=50005; int n,q,a[N],opt,x,y; struct Segtree{int l,r,lmx,rmx,mx,sum;}t[N<<…

SPOJ GSS3 Can you answer these queries III[线段树]

SPOJ - GSS3 Can you answer these queries III Description You are given a sequence A of N (N <= 50000) integers between -10000 and 10000. On this sequence you have to apply M (M <= 50000) operations: modify the i-th element in the sequence or for giv…

数据结构（线段树）：SPOJ GSS3 - Can you answer these queries III

GSS3 - Can you answer these queries III You are given a sequence A of N (N <= 50000) integers between -10000 and 10000. On this sequence you have to apply M (M <= 50000) operations: modify the i-th element in the sequence or for given x y print max{…

线段树 SP1716 GSS3 - Can you answer these queries III

SP1716 GSS3 - Can you answer these queries III 题意翻译 n 个数,q 次操作操作0 x y把A_xAx 修改为yy 操作1 l r询问区间[l, r] 的最大子段和依旧是维护最大子段和,还是再敲一遍比较好. code: #include<iostream> #include<cstdio> #define ls(o) o<<1 #define rs(o) o<<1|1 using namespace std…

SP1716 GSS3 - Can you answer these queries III（单点修改，区间最大子段和）

题意翻译 nnn 个数, qqq 次操作操作0 x y把 AxA_xAx 修改为 yyy 操作1 l r询问区间 [l,r][l, r][l,r] 的最大子段和题目描述 You are given a sequence A of N (N <= 50000) integers between -10000 and 10000. On this sequence you have to apply M (M <= 50000) operations: modify the i-th ele…

SP1716 GSS3 - Can you answer these queries III - 动态dp,线段树

GSS3 Description 动态维护最大子段和,支持单点修改. Solution 设 \(f[i]\) 表示以 \(i\) 为结尾的最大子段和, \(g[i]\) 表示 \(1 \sim i\) 的最大子段和,那么 \[f[i] = max(f[i - 1] + a[i], a[i])\] \[g[i] = max(g[i - 1], f[i])\] 发现只跟前一项有关.我们希望使用矩阵乘法的思路,但是矩阵乘法通常只能适用于递推问题.因此我们引入广义矩阵乘法. 矩阵乘法问题可分治的原因在于…