UVA1614(贪心）

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Hell on the Markets Time Limit:3000MS Memory Limit:Unknown 64bit IO Format:%lld & %llu [Submit] [Go Back] [Status] Description Most financial institutions had become insolvent during financial crisis and went bankrupt or were bought by larger i…

UVA-1614 Hell on the Markets（贪心+推理）（有待补充）

题目大意:一个整数序列a,1≤a[i]≤i.问能否通过在一些元素前加上负号,使得整个序列和为0. 题目分析:贪心.贪心策略:每次都先选最大的元素加负号(或保留,不加负号). 贪心依据:对于1≤a[i]≤i,1~sum[i]总能表示出来. 贪心依据证明:用数学归纳法证明,当i=1时,显然成立.假设当i=k时,也成立.当i=k+1时,(先证明到这儿,有空再补). 代码如下: # include<iostream> # include<cstdio> # include<cst…

BZOJ 1692: [Usaco2007 Dec]队列变换 [后缀数组贪心]

1692: [Usaco2007 Dec]队列变换 Time Limit: 5 Sec Memory Limit: 64 MBSubmit: 1383 Solved: 582[Submit][Status][Discuss] Description FJ打算带他的N(1 <= N <= 30,000)头奶牛去参加一年一度的“全美农场主大奖赛”.在这场比赛中,每个参赛者都必须让他的奶牛排成一列,然后领她们从裁判席前依次走过. 今年,竞赛委员会在接受队伍报名时,采用了一种新的登记规则:他们把所…

HDOJ 1051. Wooden Sticks 贪心结构体排序

Wooden Sticks Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 15564 Accepted Submission(s): 6405 Problem Description There is a pile of n wooden sticks. The length and weight of each stick a…

HDOJ 1009. Fat Mouse' Trade 贪心结构体排序

FatMouse' Trade Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 56784 Accepted Submission(s): 19009 Problem Description FatMouse prepared M pounds of cat food, ready to trade with the cats g…

BZOJ 1691: [Usaco2007 Dec]挑剔的美食家 [treap 贪心]

1691: [Usaco2007 Dec]挑剔的美食家 Time Limit: 5 Sec Memory Limit: 64 MBSubmit: 786 Solved: 391[Submit][Status][Discuss] Description 与很多奶牛一样,Farmer John那群养尊处优的奶牛们对食物越来越挑剔,随便拿堆草就能打发她们午饭的日子自然是一去不返了.现在,Farmer John不得不去牧草专供商那里购买大量美味多汁的牧草,来满足他那N(1 <= N <= 100,…

【Codeforces 738D】Sea Battle（贪心）

http://codeforces.com/contest/738/problem/D Galya is playing one-dimensional Sea Battle on a 1 × n grid. In this game a ships are placed on the grid. Each of the ships consists of bconsecutive cells. No cell can be part of two ships, however, the shi…