这个题是在二分的题单上的,可是依据二分法写出来的会在oj上超时.依据题目以下给出的提示能够发现能通过贪心法每次都找最能满足的情况去填充每个包,这样就能保证使用的包的数量是最少的 二分法解法: #include <iostream> #include <stdio.h> #include <cstring> #include <algorithm> #define MAX 100000 using namespace std; int n,length; in…

A set of n 1-dimensional items have to be packed in identical bins. All bins have exactly the samelength l and each item i has length li ≤ l. We look for a minimal number of bins q such that• each bin contains at most 2 items,• each item is packed in…

  Time Limit:3000MS     Memory Limit:0KB     64bit IO Format:%lld & %llu Submit Status Description   A set of n<tex2html_verbatim_mark> 1-dimensional items have to be packed in identical bins. All bins have exactly the same length l<tex2html_…

题目大意:给定n个物品的重量,无限个容量为m的箱子,每个箱子最多装两个物品,要把所有的物品都装下,最少需要多少个箱子. 题目分析:贪心策略:每次将最重和最轻的两个物品放到一个箱子里,如果装不下,则将最重的单独装到一个箱子里. 代码如下: # include<iostream> # include<cstdio> # include<cstring> # include<algorithm> using namespace std; int a[100005]…

题意:给定n个物品的重量l[i],背包的容量为w,同时要求每个背包最多装两个物品,求至少要多少个背包才能装下所有的物品 和之前做的独木舟上的旅行一样,注意一下格式就好了 #include<iostream> #include<cstdio> #include<cstring> #include <cmath> #include<stack> #include<vector> #include<map> #include&l…

每次选最大的物品和最小的物品放一起,如果放不下,大物体孤独终生,否则相伴而行... 答案变得更优是因为两个物品一起放了,最大的物品是最难匹配的,如果和最小的都放不下的话,和其它匹配也一定放不下了. #include<bits/stdc++.h> using namespace std; ; int a[maxn]; template<class T> inline void scan_d(T *ret) { ; '); +(c-'); c = getchar();} } int m…

Bin Packing 题目链接:http://acm.hust.edu.cn/vjudge/contest/view.action?cid=85904#problem/F 题目: A set of n<tex2html_verbatim_mark> 1-dimensional items have to be packed in identical bins. All bins have exactly the same length l<tex2html_verbatim_mark&…

题目来源:https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=3&page=show_problem&problem=38  Ecological Bin Packing  Background Bin packing, or the placement of objects of certain weights into different bins subject…

Intervals 题目连接: http://codeforces.com/gym/100231/attachments Description 给你n个区间,告诉你每个区间内都有ci个数 然后你需要找一个最小的点集,使得满足这n个区间的条件 Input n 然后li,ri,ci Output 输出最小点集大小 Sample Input 5 3 7 3 8 10 3 6 8 1 1 3 1 10 11 1 Sample Output 6 Hint 题意 题解: 线段树+二分+贪心 首先我们贪心一…

Background Bin packing, or the placement of objects of certain weights into different bins subject to certain constraints, is an historically interesting problem. Some bin packing problems are NP-complete but are amenable to dynamic programming solut…