855B - Marvolo Gaunt's Ring 思路:①枚举a[j],a[i]和a[k]分别用前缀最小值最大值和后缀最小值和后缀最大值确定. ②dp,dp[i][j]表示到第j为止,前i+1个值加起来的最大值. 代码: 代码①: #include<bits/stdc++.h> using namespace std; #define ll long long ; const int INF=0x3f3f3f3f; int a[N]; int premx[N]; int premn[N]…

B. Marvolo Gaunt's Ring Professor Dumbledore is helping Harry destroy the Horcruxes. He went to Gaunt Shack as he suspected a Horcrux to be present there. He saw Marvolo Gaunt's Ring and identified it as a Horcrux. Although he destroyed it, he is sti…

Description Professor Dumbledore is helping Harry destroy the Horcruxes. He went to Gaunt Shack as he suspected a Horcrux to be present there. He saw Marvolo Gaunt's Ring and identified it as a Horcrux. Although he destroyed it, he is still affected…

B. Marvolo Gaunt's Ring 这种一般只有三个的都可以处理前缀和后缀,再枚举中间这个值. 这个和之前写过的C. Four Segments 前缀后缀 处理方式很像. #include <cstdio> #include <cstring> #include <cstdlib> #include <algorithm> #include <queue> #include <vector> #include <io…

传送门 Description 给定三个数 \(p~,~q~,~r~\),以及一个数组 \(a\), 找出三个数 \(i~,~j~,~k\) ,其中 \(i~\leq~j~\leq~k\) 最大化 \(p~\times~a_i~+~q~\times~a_j~+~r~\times~a_r\) Input 第一行是数组长度 \(n\) 以及 \(p~,~q~,~r~\). 第二行 \(n\) 个数代表这个数组 Output 输出一个整数代表答案 Hint \(-10^5~\leq~n~\leq~10…

[链接]h在这里写链接 [题意] 给你n个数字; 让你在其中找出三个数字i,j,k(i<=j<=k); 使得p*a[i]+q*a[j]+r*a[k]最大; [题解] /*     有一个要求i<=j<=k;     也就是说系数之间的下标是有关系的.     枚举第一个位置的下标i;         则第二个人j         i<=j<n         枚举中间那个人的位置在哪.     求出前i个位置,第一个人能获得的最大值是多少     求出后n-i个位置,第…

邓布利多教授正在帮助哈利摧毁魂器.当他怀疑一个魂器出现在那里时,他去了冈特沙克.他看到Marvolo Gaunt的戒指,并将其确定为魂器.虽然他摧毁了它,但仍然受到诅咒的影响.斯内普教授正在帮助邓布利多解除诅咒.为此,他想给Dumbledore提供他制作的药水x滴. x的值被计算为给定p,q,r和阵列a1,a2,......的p·ai + q·aj + r·ak的最大值,使得1≤i≤j≤k≤n.帮助Snape找到x的值.请注意x的值可能是负数. Input 第一行输入包含4个整数n,p,q,r(…

B. Marvolo Gaunt's Ring time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Professor Dumbledore is helping Harry destroy the Horcruxes. He went to Gaunt Shack as he suspected a Horcrux to be…

A. Tom Riddle's Diary time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Harry Potter is on a mission to destroy You-Know-Who's Horcruxes. The first Horcrux that he encountered in the Chamber…

Names appearing in "Harry Potter" 1.Harry Potter ①Harry is from Henry. ②Harry is related to Old High German Heri, which means army. James Potter and Lily Evans 2.Hermione Granger Hands up if you had been pronouncing Hermione's name wrong when yo…