万恶之源 目录 题意 思路 贪心的原则是什么呢? 错解 正解 代码实现 书上的代码 我的代码 比较一下 问题 题意 给定若干个点的坐标,与范围R.每个点可以选择是否标记,标记后这个点的左右范围R内的所有点也会被标记,求为使所有点被标记,我们要主动标记多少个点. 思路 这题总感觉可以用搜索做,毕竟每个点的状态要么是1要么是0.但这是书上贪心的例题,那肯定得用贪心做啦. 贪心的原则是什么呢? 错解 首先我们的目标是尽可能少的标记,因此我们当然可以希望每次一次性标记的点越多越好,那么我们是不是可以遍历…

Saruman the White must lead his army along a straight path from Isengard to Helm's Deep. To keep track of his forces, Saruman distributes seeing stones, known as palantirs, among the troops. Each palantir has a maximum effective range of R units, and…

直线上有N个点.点i的位置是Xi.从这N个点中选择若干个,给它们加上标记.对每一个点,其距离为R以内的区域里必须又带有标记的点(自己本身带有标记的点,可以认为与其距离为0的地方有一个带有标记的点).在满足这个条件的情况下,希望能为尽可能少的点添加标记.请问至少要有多少点被加上标记? #include "iostream" #include "algorithm" using namespace std; const int MAX_N = 1000; int N=6…

带来两题贪心算法的题. 1.给定长度为N的字符串S,要构造一个长度为N的字符串T.起初,T是一个空串,随后反复进行下面两个操作:1.从S的头部删除一个字符,加到T的尾部.2.从S的尾部删除一个字符,加到T的尾部.求你任意采取这两个步骤后能得到的最小字符串T 2.直线上有N个点,点i的位置是xi,这N个点中选择若干个做上标记,对于每个点,在他们距离为R的区域内必须带有标记点,求在满足这个条件的情况下,所需要标记点的最少个数. 1.POJ 3617 Best Cow Line http://poj.…

 Saruman's Army Time Limit:1000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Submit Status Practice POJ 3069 Appoint description:  System Crawler  (2015-04-27) Description Saruman the White must lead his army along a straight path fro…

Saruman's Army Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 131072/65536K (Java/Other) Total Submission(s) : 3   Accepted Submission(s) : 2 Problem Description Saruman the White must lead his army along a straight path from Isengard to Helm…

Saruman's Army Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 18794   Accepted: 9222 Description Saruman the White must lead his army along a straight path from Isengard to Helm’s Deep. To keep track of his forces, Saruman distributes s…

POJ 3069 Saruman's Army(萨鲁曼军) Time Limit: 1000MS   Memory Limit: 65536K [Description] [题目描述] Saruman the White must lead his army along a straight path from Isengard to Helm’s Deep. To keep track of his forces, Saruman distributes seeing stones, know…

Saruman's Army Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 8477   Accepted: 4317 Description Saruman the White must lead his army along a straight path from Isengard to Helm’s Deep. To keep track of his forces, Saruman distributes se…

Saruman's Army Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 13242   Accepted: 6636 Description Saruman the White must lead his army along a straight path from Isengard to Helm's Deep. To keep track of his forces, Saruman distributes s…