zoukankan      html  css  js  c++  java
  • HDOJ 4883 TIANKENG’s restaurant

    称号:

    TIANKENG’s restaurant

    Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/65536 K (Java/Others)
    Total Submission(s): 249    Accepted Submission(s): 125


    Problem Description
    TIANKENG manages a restaurant after graduating from ZCMU, and tens of thousands of customers come to have meal because of its delicious dishes. Today n groups of customers come to enjoy their meal, and there are Xi persons in the ith group in sum. Assuming that each customer can own only one chair. Now we know the arriving time STi and departure time EDi of each group. Could you help TIANKENG calculate the minimum chairs he needs to prepare so that every customer can take a seat when arriving the restaurant?

     

    Input
    The first line contains a positive integer T(T<=100), standing for T test cases in all.

    Each cases has a positive integer n(1<=n<=10000), which means n groups of customer. Then following n lines, each line there is a positive integer Xi(1<=Xi<=100), referring to the sum of the number of the ith group people, and the arriving time STi and departure time Edi(the time format is hh:mm, 0<=hh<24, 0<=mm<60), Given that the arriving time must be earlier than the departure time.

    Pay attention that when a group of people arrive at the restaurant as soon as a group of people leaves from the restaurant, then the arriving group can be arranged to take their seats if the seats are enough.
     

    Output
    For each test case, output the minimum number of chair that TIANKENG needs to prepare.
     

    Sample Input
    2 2 6 08:00 09:00 5 08:59 09:59 2 6 08:00 09:00 5 09:00 10:00
     

    Sample Output
    11 6
     

    解题思路:

    转换为RMQ问题,1天24h,1440min;a[i]表示第i分钟的人数,n表示时间[t1,t2)之间来的人数,对这个区间内的a[i]+n,最后求的是a[i]的最大值。

    解法1:模拟


    #include <cstdio>
    #include <cstring>
    #include <algorithm>
    using namespace std;
    
    #define clr(a) memset(a, 0, sizeof(a))
    #define rep(i,s,t) for(int i = s; i <= t; ++i)
    #define per(i,s,t) for(int i = s; i >= t; --i)
    
    const int MAXN = 1450;
    int t, n, a[MAXN];
    
    int main()
    {
        scanf("%d", &t);
        while(t--)
        {
            clr(a);
            scanf("%d", &n);
            int num, h1, m1, h2, m2;
            rep(i,0,n-1)
            {
                scanf("%d%d:%d%d:%d", &num, &h1, &m1, &h2, &m2);
                int s1 = h1 * 60 + m1, s2 = h2 * 60 + m2;
                rep(j,s1,s2-1) a[j] += num;
            }
            int ans = -1;
            rep(i,0,MAXN-1) ans = max(ans,a[i]);
            printf("%d
    ", ans);
        }
        return 0;
    }

    解法2:线段树(ZKW)

    #include <cstdio>
    #include <cstring>
    #include <algorithm>
    using namespace std;
    
    #define clr(a) memset(a, 0, sizeof(a))
    #define rep(i,s,t) for(int i = s; i <= t; ++i)
    #define per(i,s,t) for(int i = s, i >= t; --i)
    
    const int M = 1<<11, MAXN = 1440;
    int icase, n, a[M << 1];
    
    
    void Add_x(int s, int t, int x)
    {
        int b = 0;
        for(s=s+M-1, t=t+M+1; s^t^1; s>>=1, t>>=1)
        {
            if(~s&1) a[s^1] += x;
            if( t&1) a[t^1] += x;
            b = max(a[s], a[s^1]), a[s]-=b, a[s^1]-=b, a[s>>1]+=b;
            b = max(a[t], a[t^1]), a[t]-=b, a[t^1]-=b, a[t>>1]+=b;
          //  printf("%d %d %d %d
    ", s, t, a[s^1], a[t^1]);
        }
        for( ; s > 1; s>>=1)
        b = max(a[s], a[s^1]), a[s]-=b, a[s^1]-=b, a[s>>1]+=b;
    }
    
    int Max(int s, int t)
    {
        int lans = 0, rans = 0, ans = 0;
        for(s=s+M-1,t=t+M+1; s^t^1; s>>=1, t>>=1)
        {
            lans+=a[s], rans+=a[t];
            if(~s&1) lans = max(lans, a[s^1]);
            if( t&1) rans = max(rans, a[t^1]);
         //   printf("%d %d %d %d
    ", s, t, lans, rans);
        }
        ans = max(lans+a[s], rans+a[t]);
        while(s>1) ans+=a[s>>=1];
        return ans;
    }
    
    void show()
    {
        for(int i = 0; i < M; i++)
            printf("%d ", a[i]);
        printf("
    ");
    }
    
    int main()
    {
        scanf("%d", &icase);
        while(icase--)
        {
            scanf("%d", &n); clr(a);
            int num, h1, m1, h2, m2;
            for(int i = 0; i < n; ++i)
            {
                scanf("%d%d:%d%d:%d", &num, &h1, &m1, &h2, &m2);
                int s1 = h1 * 60 + m1, s2 = h2 * 60 + m2;
                Add_x(1+s1, s2, num);
            }
        //    show();
            printf("%d
    ", Max(1,1440));
        }
        return 0;
    }


    版权声明:本文博客原创文章。博客,未经同意,不得转载。

  • 相关阅读:
    利用docker搭建rtmp服务器(1)
    ES6转换为ES5
    一些乱七八糟的东西
    xss攻击和sq注入
    python asyncio笔记
    图解密码技术一些笔记
    做网页前端遇到的一些问题
    错误处理的一些想法
    吐槽下国内的云笔记
    python的编码问题
  • 原文地址:https://www.cnblogs.com/hrhguanli/p/4720621.html
Copyright © 2011-2022 走看看