• POJ 1064 Cable master 【二分】


    Cable master
    Time Limit: 1000MS   Memory Limit: 10000K
    Total Submissions: 37400   Accepted: 7940

    Description

    Inhabitants of the Wonderland have decided to hold a regional programming contest. The Judging Committee has volunteered and has promised to organize the most honest contest ever. It was decided to connect computers for the contestants using a "star" topology - i.e. connect them all to a single central hub. To organize a truly honest contest, the Head of the Judging Committee has decreed to place all contestants evenly around the hub on an equal distance from it. 
    To buy network cables, the Judging Committee has contacted a local network solutions provider with a request to sell for them a specified number of cables with equal lengths. The Judging Committee wants the cables to be as long as possible to sit contestants as far from each other as possible. 
    The Cable Master of the company was assigned to the task. He knows the length of each cable in the stock up to a centimeter,and he can cut them with a centimeter precision being told the length of the pieces he must cut. However, this time, the length is not known and the Cable Master is completely puzzled. 
    You are to help the Cable Master, by writing a program that will determine the maximal possible length of a cable piece that can be cut from the cables in the stock, to get the specified number of pieces.

    Input

    The first line of the input file contains two integer numb ers N and K, separated by a space. N (1 = N = 10000) is the number of cables in the stock, and K (1 = K = 10000) is the number of requested pieces. The first line is followed by N lines with one number per line, that specify the length of each cable in the stock in meters. All cables are at least 1 meter and at most 100 kilometers in length. All lengths in the input file are written with a centimeter precision, with exactly two digits after a decimal point.

    Output

    Write to the output file the maximal length (in meters) of the pieces that Cable Master may cut from the cables in the stock to get the requested number of pieces. The number must be written with a centimeter precision, with exactly two digits after a decimal point. 
    If it is not possible to cut the requested number of pieces each one being at least one centimeter long, then the output file must contain the single number "0.00" (without quotes).

    Sample Input

    4 11
    8.02
    7.43
    4.57
    5.39

    Sample Output

    2.00

    Source

     

    #include <cstdio>
    #include <cmath>
    using namespace std;
    const double ESP = 1e-5;
    const int INF = 1e8;
    double len[10000];
    int n, k;
    
    bool judge(double x) {
        int cnt = 0;
        for(int i = 0; i < n; i++) {
            cnt += (int)(len[i]/x);
        }
        return cnt >= k;
    }
    int main() {
        while (scanf("%d%d", &n, &k), n || k) {
            for (int i = 0; i < n; i++) {
                scanf("%lf", &len[i]);
            }
            double l = 0, r = (double)INF;
            for (int i = 0; i < 100; i++) {
                double mid = (l + r)/2;
                if (judge(mid)) l = mid;
                else  r = mid;
            }
            printf("%.2lf
    ", l);
        }
        return 0;
    }
  • 相关阅读:
    3名百度 ,京东,腾讯被辞退的高级Android工程师现在怎么了?30岁真的是“罪”吗
    Python 开发者在迁移到 Go 前需要知道的事情
    centos7 常用命令--查看当前用户的4种方法
    Centos7找不到ifconfig和netstat命令
    Centos 7 修改日期和时间的命令
    如何利用MobaX同时处理多台虚拟机输入相同命令如何利用MobaX同时处理多台虚拟机输入相同命令
    配置坑了我好久:Logback按天生成文件失效
    quartz系列文章
    SpringBoot使用多实例QUARTZ出现重复执行问题
    IDEA多个springboot项目启动修改端口
  • 原文地址:https://www.cnblogs.com/cniwoq/p/6770905.html
Copyright © 2020-2023  润新知