传送门 A set of n 1-dimensional items have to be packed in identical bins. All bins have exactly the same length 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 pa…

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…

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…

题意:给定N物品的重量,背包容量M,一个背包最多放两个东西.问至少多少个背包. 思路:贪心,最大的和最小的放.如果这样都不行,那最大的一定孤独终生.否则,相伴而行. 代码: #include <cstdio> #include <cstring> #include <algorithm> using namespace std; #define N 100100 int a[N]; int main() { int t; scanf("%d", &a…

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…

题意:给定N(N<=10^5)个物品的重量Li,背包的容量M,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. 分析:先排序,从最重的开始装,如果重量小于M,则如果能装一个重量最轻的,就再装一个重量最轻的,依此类推. #pragma comment(linker, "/STACK:102400000, 102400000") #include<cstdio> #include<cstring> #include<cstdlib&…

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…

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…

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&…

Vector bin packing:first fit / best fit / grasp 成本:性价比 (先验) 设计评价函数: evaluation function:cosine similarity / vertical distance / dynamic programming 搜索: 启发式方法
local search 邻域解 population based 粒子群优化,遗传算法,模拟退火 simulated annealing 模拟退火 应用 Solution 邻域拆分/…