Description Karen just got home from the supermarket, and is getting ready to go to sleep. After taking a shower and changing into her pajamas, she looked at her shelf and saw an album. Curious, she opened it and saw a trading card collection. She re…

Karen has just arrived at school, and she has a math test today! The test is about basic addition and subtraction. Unfortunately, the teachers were too busy writing tasks for Codeforces rounds, and had no time to make an actual test. So, they just pu…

A. Cards time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output There are n cards (n is even) in the deck. Each card has a positive integer written on it. n / 2 people will play new card game. At…

On the way home, Karen decided to stop by the supermarket to buy some groceries. She needs to buy a lot of goods, but since she is a student her budget is still quite limited. In fact, she can only spend up to b dollars. The supermarket sells n goods…

C. Karen and Game time limit per test 2 seconds memory limit per test 512 megabytes input standard input output standard output On the way to school, Karen became fixated on the puzzle game on her phone! The game is played as follows. In each level,…

To stay woke and attentive during classes, Karen needs some coffee! Karen, a coffee aficionado, wants to know the optimal temperature for brewing the perfect cup of coffee. Indeed, she has spent some time reading several recipe books, including the u…

Karen is getting ready for a new school day! It is currently hh:mm, given in a 24-hour format. As you know, Karen loves palindromes, and she believes that it is good luck to wake up when the time is a palindrome. What is the minimum number of minutes…

原文链接http://www.cnblogs.com/zhouzhendong/p/8397685.html 2018-02-01 $A$ 题意概括 你要买$m$斤水果,现在有$n$个超市让你选择. 每个超市的水果价格是固定的.第$i$个超市的水果价格用两个整数$a_i和b_i$来表示.含义是$a_i$元可以买$b_i$斤. 问你买$m$斤水果最少花费多少钱. 题解 直接枚举超市,判断最少的花费就可以了. 代码 #include <cstring> #include <cstdio>…

F - Cards and Joy 思路:比较容易想到dp,直接dp感觉有点难,我们发现对于每一种数字要处理的情况都相同就是有 i 张牌 要给 j 个人分, 那么我们定义dp[ i ][ j ]表示 i 张牌给 j 个人分最大的价值可以得到dp方程如下: dp[ i ][ j ] = max(dp[ i - u ][ j - 1 ] + f[ u ] )   u <= k 暴力转移就好了. #include<bits/stdc++.h> #define LL long long #def…

题目连接:http://codeforces.com/contest/999/problem/F 解题心得: 题意说的很复杂,就是n个人玩游戏,每个人可以得到k张卡片,每个卡片上有一个数字,每个人有一个喜欢的数字,每一个玩游戏的人如果有不同数量自己喜欢的卡片就有不同的欢乐值.问怎样分配使欢乐值最大. 就是一个组合背包的问题,dp[i][j]代表有i个人,j张喜欢的卡片,得到的总欢乐值最大是多少.在转移的过程中只需要枚举第i个人有几张自己最喜欢的卡片就可以了. 转移方程式dp[i][j] = ma…