本题解法非常多,由于给出的数据特殊性故此能够使用DFS和BFS,也能够使用01背包DP思想来解. 由于一般大家都使用DFS,这里使用非常少人使用的BFS.缺点是比DFS更加耗内存,只是长处是速度比DFS快. 当然也比DFS难写点: int N, B; int Height[21]; inline int mMin(int a, int b) { return a > b? b : a; } inline int mMax(int a, int b) { return a < b? b : a;…

http://poj.org/problem?id=3628 01背包 #include <cstdio> #include <iostream> #include <cstring> #include <algorithm> #define maxn 21 #define ll long long using namespace std; ll h[maxn]; int n; ll b; ll dp[]; ll max1(ll a,ll b) { retu…

传送门:http://poj.org/problem?id=3628 题目看了老半天,牛来叠罗汉- -|||和书架什么关系啊.. 大意是:一群牛来叠罗汉,求超过书架的最小高度. 0-1背包的问题,对于第i只牛可以放或者不放.然后最后求出大于书架高度的,减去书架高度即可. 也可以倒着来看.背包的容量为牛总的高度-书架的高度,求不超过这个容量的最大值,最后容量-这个值就是答案了.(推荐) 还可以DFS.. #include<cstdio> #include<cstring> #incl…

Bookshelf 2 Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 9488   Accepted: 4311 Description Farmer John recently bought another bookshelf for the cow library, but the shelf is getting filled up quite quickly, and now the only available…

Bookshelf 2 Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 7496   Accepted: 3451 Description Farmer John recently bought another bookshelf for the cow library, but the shelf is getting filled up quite quickly, and now the only available…

Bookshelf 2 Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 11105   Accepted: 4928 Description Farmer John recently bought another bookshelf for the cow library, but the shelf is getting filled up quite quickly, and now the only availabl…

题意:给出n头牛的身高,以及一个书架的高度,问怎样选取牛,使得它们的高的和超过书架的高度最小. 将背包容量转化为所有牛的身高之和,就可以用01背包来做=== #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> #define maxn 2000005 using namespace std; ]; int main() { ,tmp=; scanf("%…

题目大意:FJ有n头奶牛,和一个高为h的架子,给出每头奶牛高度,求使奶牛叠加起来超过架子的最低高度是多少. 题目思路:求出奶牛叠加能达到的所有高度,并用dp[]保存,最后进行遍历,找出与h差最小的dp[]即所求答案. #include<cstdio> #include<stdio.h> #include<cstdlib> #include<cmath> #include<iostream> #include<algorithm> #i…

POJ 2823 Sliding  Window 题解 Description An array of size n ≤ 106 is given to you. There is a sliding window of size k which is moving from the very left of the array to the very right. You can only see the k numbers in the window. Each time the slidi…

Description Farmer John recently bought another bookshelf for the cow library, but the shelf is getting filled up quite quickly, and now the only available space is at the top. FJ has N cows (1 ≤ N ≤ 20) each with some height of Hi (1 ≤ Hi ≤ 1,000,00…