B. Alyona and flowers Problem Description: Let's define a subarray as a segment of consecutive flowers. The mother suggested some set of subarrays. Alyona wants to choose several of the subarrays suggested by her mother. After that, each of the flowe…

Alyona and flowers time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Little Alyona is celebrating Happy Birthday! Her mother has an array of n flowers. Each flower has some mood, the mood of…

time limit per test2 seconds memory limit per test256 megabytes inputstandard input outputstandard output Little Alyona is celebrating Happy Birthday! Her mother has an array of n flowers. Each flower has some mood, the mood of i-th flower is ai. The…

题目要求选择一些花的集合,如果暴力去枚举每种选择方法明显是不行的.换种方式考虑:每一个集合都能为最后的答案做出要么正的.要么负的.要么0贡献,先把所有集合能做出的贡献预处理,然后从m个集合里面选择贡献为正的即可. AC代码: #include<cstdio> const int maxn=100+5; struct node{ int l,r; int ans; }b[maxn]; int a[maxn]; int main(){ int n,m; while(scanf("%d%d…

Content 有 \(n\) 个数 \(a_1,a_2,a_3,...,a_n\),给定 \(m\) 个区间,你可以选择一些区间使得它们的总和最大(也可以不选),求这个最大的总和. 数据范围:\(1\leqslant n,m\leqslant 100,-100\leqslant a_i\leqslant 100\). Solution 我们利用前缀和来求出每个区间的元素的和:设 \(s_i\) 表示前 \(i\) 个数的和,\([l,r]\) 为要表示的区间,那么这个区间的和就是 \(s_r-…

A. Alyona and copybooks time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Little girl Alyona is in a shop to buy some copybooks for school. She study four subjects so she wants to have equal…

刷了这套题  感触良多 我想 感觉上的差一点就是差很多吧 . 每次都差一点  就是差很多了... 不能气馁..要更加努力去填补那一点点.  老天不是在造物弄人,而是希望你用更好的自己去迎接自己. A. Alyona and copybooks 有n本书  还需要买k本使得(n+k)%4==0 有三种  一本 a元  两本 b元  三本 c元的 不能分开卖 问至少花多少 枚举一下即可  ... 我居然一开始搞了个dp记录买1-4本的最优策略....还wa了.... #include <stdio.…

A.Alyona and copybooks Problems: 给你一个数n和代价分别为a, b, c.数量不限的1, 2, 3,求将n凑成4的倍数的最小代价 Analysis: cj:取个模随便凑一凑就好 Tags: Implementation #define PRON "pa" #include <cstdio> #include <cstring> #include <iostream> #include <algorithm>…

Alyona and flowers CodeForces - 740B Little Alyona is celebrating Happy Birthday! Her mother has an array of n flowers. Each flower has some mood, the mood of i-th flower is ai. The mood can be positive, zero or negative. Let's define a subarray as a…

Codeforces Round #258 (Div. 2) Devu and Flowers E. Devu and Flowers time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output Devu wants to decorate his garden with flowers. He has purchased n boxes…