Pushok the dog has been chasing Imp for a few hours already. Fortunately, Imp knows that Pushok is afraid of a robot vacuum cleaner. While moving, the robot generates a string t consisting of letters 's' and 'h', that produces a lot of noise. We defi…

题目链接:点击打开链接 Pushok the dog has been chasing Imp for a few hours already. Fortunately, Imp knows that Pushok is afraid of a robot vacuum cleaner. While moving, the robot generates a string t consisting of letters 's' and 'h', that produces a lot of no…

正确的贪心方法:按照比例排序. code: #include <bits/stdc++.h> #define N 200000 #define ll long long #define setIO(s) freopen(s".in","r",stdin) using namespace std; int n; char str[N],S[N]; struct Node { int l,r; double perc; }t[N]; bool cmp(Nod…

D. Robot Vacuum Cleaner time limit per test 1 second memory limit per test 256 megabytes Problem Description Pushok the dog has been chasing Imp for a few hours already. Fortunately, Imp knows that Pushok is afraid of a robot vacuum cleaner. While mo…

[链接] 我是链接,点我呀:) [题意] 让你把n个字符串重新排序,然后按顺序连接在一起 使得这个组成的字符串的"sh"子序列最多 [题解] /* * 假设A的情况好于B * 也就对应了A排在B的前面 * 那么 * As*Bh>Ah*Bs ① * 现在假设B又比C来得好 * 那么有 * Bs*Ch>Bh*Cs ② * 由①可得 * As/Ah>Bs/Bh * 由②可得 * Bs/Bh>Cs/Ch * 那么有 * As/Ah>As/Ch * 即As*Ch&g…

题目:http://codeforces.com/gym/100338/attachments 贪心,每次枚举10的i次幂,除k后取余数r在用k-r补在10的幂上作为候选答案. #include<bits/stdc++.h> using namespace std; typedef unsigned long long ull; ; ull base[maxbit], n, k; void preDeal() { ] = ; ; i < maxbit; i++){ *]; } } voi…

[Codeforces 1214A]Optimal Currency Exchange(贪心) 题面 题面较长,略 分析 这个A题稍微有点思维难度,比赛的时候被孙了一下 贪心的思路是,我们换面值越小的货币越优.如有1,2,5,10,20,50,那么我们尽量用面值为1的.如果我们把原始货币换成面值为x的货币,设汇率为d,那么需要的原始货币为dx的倍数.显然dx越小,剩下的钱,即n取模dx会尽量小. 然后就可以枚举换某一种货币的数量,时间复杂度\(O(\frac{n}{d})\) 代码 #inclu…

原题链接:http://codeforces.com/problemset/problem/583/B 题意: 就..要打开一个电脑,必须至少先打开其他若干电脑,每次转向有个花费,让你设计一个序列,使得总花费最小. 题解: 就傻傻的走就好..从左走到右,再走回来,更新序列和答案就好. 代码: #include<iostream> #include<cstring> #include<algorithm> #include<cstdio> #define MA…

［抄题］: Given a robot cleaner in a room modeled as a grid. Each cell in the grid can be empty or blocked. The robot cleaner with 4 given APIs can move forward, turn left or turn right. Each turn it made is 90 degrees. When it tries to move into a block…

1.codeforces 349B    Color the Fence 2.链接:http://codeforces.com/problemset/problem/349/B 3.总结: 刷栅栏.1-9每个字母分别要ai升油漆,问最多可画多大的数字. 贪心,也有点考思维. #include<bits/stdc++.h> using namespace std; #define LL long long #define INF 0x3f3f3f3f int main() { ]; while(…