zoukankan      html  css  js  c++  java
  • POJ2456 Aggressive cows

    Description

    题目

    Farmer John has built a new long barn, with N (2 <= N <= 100,000) stalls. The stalls are located along a straight line at positions x1,...,xN (0 <= xi <= 1,000,000,000).

    His C (2 <= C <= N) cows don't like this barn layout and become aggressive towards each other once put into a stall. To prevent the cows from hurting each other, FJ want to assign the cows to the stalls, such that the minimum distance between any two of them is as large as possible. What is the largest minimum distance?

    Input

    Line 1: Two space-separated integers: N and C

    Lines 2..N+1: Line i+1 contains an integer stall location, xi

    Output

    Line 1: One integer: the largest minimum distance

    Analysis

    以距离为主线,可以确定遍历范围,问题在于如何判断某距离合适,这里再进行二分搜索,总时间复杂度O(nlogn^2)

    Code

    #include<bits/stdc++.h>
    using namespace std;
    int a[100000];
    int m,c;//space
    int f(int d){
        auto x=a;
        for(int i=1;i<c;++i){
            x=lower_bound(x,a+m,*x+d);
            if(x==a+m)return 0;
        }
        return 1;
    }
    int main(){
        while(~scanf("%d %d",&m,&c)){
            for(int i=0;i<m;++i)scanf("%d",&a[i]);
            sort(a,a+m);
            int l=1,r=*(a+m-1)-*a+1;
            while(l<r){
                int mid=l+(r-l)/2;
                if(f(mid)==0)r=mid;
                else l=mid+1;
            }
            printf("%d
    ",l-1);
        }
        return 0;
    }
    
    
  • 相关阅读:
    五秒自动刷新页面
    浅析MySQL中exists与in的使用 (写的非常好)
    基于shiro授权过程
    shiro认证
    jsp中<c:if>与<s:if>的区别
    链表数据结构相关
    队列Queue中add()和offer()的区别?
    Java中有几种线程池?
    解决idea使用jstl标签报错和不自动提示
    事务
  • 原文地址:https://www.cnblogs.com/chanceYu/p/13400127.html
Copyright © 2011-2022 走看看