CF474D Flowers 题解】的更多相关文章

题目:CF474D Flowers 传送门 DP?递推? 首先可以很快看出这是一道 DP 的题目,但与其说是 DP,还不如说是递推. 大家还记得刚学递推时教练肯定讲过的一道经典例题吗?就是爬楼梯,一个有 \(n\) 阶的楼梯,一个人爬上去,每次可以爬一阶也可以爬两阶,问有多少种爬法?其实这道题也是一样的,只不过把 \(2\) 换成了 \(k\) 而已. 于是我们开始分析,定义 \(dp[i]\) 为吃 \(i\) 个蛋糕的吃法总数. 很容易看出,如果 \(i<k\),就不可以一口气吃掉,只能一个…
D. Flowers time limit per test 1.5 seconds memory limit per test 256 megabytes input standard input output standard output We saw the little game Marmot made for Mole's lunch. Now it's Marmot's dinner time and, as we all know, Marmot eats flowers. At…
题目传送门 [题目大意] 有n种颜色的花,第i种颜色的花有a[i]朵,从这些花中选m朵出来,问有多少种方案?答案对109+7取模 [思路分析] 这是一个多重集的组合数问题,答案就是:$$C_{n+m-1}^{n-1}-\sum_{i=1}^{n}C_{n+m-a[i]-2}^{n-1}+\sum_{1\le i<j\le n}C_{n+m-a[i]-a[j]-3}^{n-1}-…+(-1)^nC_{n+m-\sum_{i=1}^{n}a[i]-(n+1)}^{n-1}$$ 在具体实现的时候,我们…
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-…
题面 题解 就是一个求\(\sum_{i= 1}^{n}x _ i = m\)的不重复多重集的个数, 我们可以由容斥原理得到: \[ ans = C_{n + m - 1}^{n - 1} - \sum_{i = 1}^{n}C_{n + m - f_i - 2}^{n - 1} + \sum_{1 \leq i < j \leq n}C_{n + m - f_i - f_j - 3}^{n - 1} - \cdots + (-1)^n C_{n + m - \sum_{k = 1}^{n}f_…
先把题目意思说一下: 你有F束花,编号为\(1\)~\(F\)(\(1<=F<=100\)),\(V\)个花瓶,编号为\(1\) ~\(V\)(\(1<=V<=100\)), 一束花只能放到一个花瓶里,一个花瓶只能放一束花,并且花必须按编号放入花瓶, 即若编号为\(a\)的花放到编号为\(b\)的花瓶里,那么编号为\(a+1\) ~\(F\)的花只能放在编号为\(b+1\) ~\(V\)的花瓶里, 并且,第\(i\)束花放到第\(j\)个花瓶有一个美丽值\(a_{i,j}\)(\(…
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…
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…
Pashmak and Flowers Codeforces Round #261 (Div. 2) B. Pashmak and Flowers time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Pashmak decided to give Parmida a pair of flowers from the garden.…
Codeforces Round #271 (Div. 2) A - Keyboard 题意 给你一个字符串,问你这个字符串在键盘的位置往左边挪一位,或者往右边挪一位字符,这个字符串是什么样子 题解 模拟一下就好了 代码 #include<bits/stdc++.h> using namespace std; string s[3]; map<char,int>r,c; char ss[2][107]; int main() { s[0]="qwertyuiop"…
104. Little shop of flowers time limit per test: 0.25 sec. memory limit per test: 4096 KB 问题: 你想要将你的花窗安排得最具美感.有F束花,每一束花都不一样,至少有F个按顺序排成一行的花瓶.花瓶从左到右,依次编号1-V.而花放置的位置是可以改变的,花依次编号1到F.花的序号有一个特征,即是序号决定了花束出现在花瓶里的顺序.例如,有两束花编号i和j,满足i<j,那么i所在的花瓶一定要在j所在花瓶的左边,即是i…
[POJ1157]LITTLE SHOP OF FLOWERS 试题描述 You want to arrange the window of your flower shop in a most pleasant way. You have F bunches of flowers, each being of a different kind, and at least as many vases ordered in a row. The vases are glued onto the s…
C. Watering Flowers 题目连接: http://www.codeforces.com/contest/617/problem/C Descriptionww.co A flowerbed has many flowers and two fountains. You can adjust the water pressure and set any values r1(r1 ≥ 0) and r2(r2 ≥ 0), giving the distances at which t…
Flowers Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 2616    Accepted Submission(s): 1287 Problem Description As is known to all, the blooming time and duration varies between different kinds…
Description Farmer John went to cut some wood and left N (2 <= N <= 100,000) cows eating the grass, as usual. When he returned, he found to his horror that the cows were in his garden eating his beautiful flowers. Wanting to minimize the subsequent…
1634: [Usaco2007 Jan]Protecting the Flowers 护花 Time Limit: 5 Sec  Memory Limit: 64 MBSubmit: 448  Solved: 276[Submit][Status] Description Farmer John went to cut some wood and left N (2 <= N <= 100,000) cows eating the grass, as usual. When he retur…
C. Wet Shark and Flowers time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output There are n sharks who grow flowers for Wet Shark. They are all sitting around the table, such that sharks i and i …
Flowers Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 2579    Accepted Submission(s): 1265 Problem Description As is known to all, the blooming time and duration varies between different kinds…
1634: [Usaco2007 Jan]Protecting the Flowers 护花 Time Limit: 5 Sec  Memory Limit: 64 MBSubmit: 493  Solved: 310[Submit][Status] Description Farmer John went to cut some wood and left N (2 <= N <= 100,000) cows eating the grass, as usual. When he retur…
描述Alice is so popular that she can receive many flowers everyday. She has N vases numbered from 0 to N-1. When she receive some flowers, she will try to put them in the vases, one flower in one vase. She randomly choose the vase A and try to put a fl…
E. Devu and Flowers 题目连接: http://codeforces.com/contest/451/problem/E Description Devu wants to decorate his garden with flowers. He has purchased n boxes, where the i-th box contains fi flowers. All flowers in a single box are of the same color (hen…
突然很想刷刷题,LeetCode是一个不错的选择,忽略了输入输出,更好的突出了算法,省去了不少时间. dalao们发现了任何错误,或是代码无法通过,或是有更好的解法,或是有任何疑问和建议的话,可以在对应的随笔下面评论区留言,我会及时处理,在此谢过了. 过程或许会很漫长,也很痛苦,慢慢来吧. 编号 题名 过题率 难度 1 Two Sum 0.376 Easy 2 Add Two Numbers 0.285 Medium 3 Longest Substring Without Repeating C…
题目描述 Farmer John went to cut some wood and left N (2 <= N <= 100,000) cows eating the grass, as usual. When he returned, he found to his horror that the cows were in his garden eating his beautiful flowers. Wanting to minimize the subsequent damage,…
原题链接在这里:https://leetcode.com/problems/can-place-flowers/description/ 题目: Suppose you have a long flowerbed in which some of the plots are planted and some are not. However, flowers cannot be planted in adjacent plots - they would compete for water an…
题目描述 Farmer John went to cut some wood and left N (2 ≤ N ≤ 100,000) cows eating the grass, as usual. When he returned, he found to his horror that the cluster of cows was in his garden eating his beautiful flowers. Wanting to minimize the subsequent…
D. Flowers   We saw the little game Marmot made for Mole's lunch. Now it's Marmot's dinner time and, as we all know, Marmot eats flowers. At every dinner he eats some red and white flowers. Therefore a dinner can be represented as a sequence of sever…
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…
洛谷 P2878 [USACO07JAN]保护花朵Protecting the Flowers 洛谷传送门 JDOJ 1009: 护花 JDOJ传送门 Description FJ出去砍木材去了,把N(2<=N<=100,000)头牛留在家中吃草,当他回来的时候,发现奶牛们都跑到花园里吃花去了,为了减少损失,FJ打算把牛移到牛棚中去. 每头牛的位置离牛棚需要Ti分钟(1<=Ti<=2,000,000),而且在等待被移走的过程中,每分钟破坏Di(1<=Di<=100)朵花…
Zap FGD正在破解一段密码,他需要回答很多类似的问题:对于给定的整数a,b和d,有多少正整数对x,y,满足x<=a,y<=b,并且gcd(x,y)=d.作为FGD的同学,FGD希望得到你的帮助. Input 第一行包含一个正整数n,表示一共有n组询问.(1<=n<= 50000)接下来n行,每行表示一个询问,每行三个 正整数,分别为a,b,d.(1<=d<=a,b<=50000) Output 对于每组询问,输出到输出文件zap.out一个正整数,表示满足条件…
Protecting the Flowers Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 11402   Accepted: 4631 Description Farmer John went to cut some wood and left N (2 ≤ N ≤ 100,000) cows eating the grass, as usual. When he returned, he found to his h…