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_…

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_verbatim_mark> and each item i<tex2html_verbatim_mark> has length lil<tex2html_…

H - 贪心 Crawling in process... Crawling failed Time Limit:3000MS     Memory Limit:0KB     64bit IO Format:%lld & %llu Submit Status Description     Most financial institutions had become insolvent during financial crisis and went bankrupt or were boug…

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]…

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…

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…

F - 贪心+ 二分 Time Limit:3000MS     Memory Limit:0KB     64bit IO Format:%lld & %llu   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_ver…

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&…

1,贪心算法 贪心算法(又称贪婪算法)是指,在对问题求解时,总是做出在当前看来是最好的选择.也就是说,不从整体最优上加以考虑,他所做出的的时在某种意义上的局部最优解. 贪心算法并不保证会得到最优解,但是在某些问题上贪心算法的解就是最优解.要会判断一个问题能否用贪心算法来计算.贪心算法和其他算法比较有明显的区别,动态规划每次都是综合所有问题的子问题的解得到当前的最优解(全局最优解),而不是贪心地选择:回溯法是尝试选择一条路,如果选择错了的话可以“反悔”,也就是回过头来重新选择其他的试试. 1.1…