杭电4883--TIANKENG’s restaurant（区间覆盖）-优快云博客

本文介绍了一个关于餐厅座位调度的问题，顾客分为多个团体进入餐厅就餐，每个团体有不同的到达时间和离开时间。通过计算每分钟的座位需求变化，找出所需座位数量的最大值，从而确定餐厅至少需要准备多少个座位。

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TIANKENG’s restaurant

Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 131072/65536 K (Java/Others)
Total Submission(s): 1536 Accepted Submission(s): 556

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 
  

Source

BestCoder Round #2

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大神各种有啊，虐心的一天；

区间覆盖，求最大重合数。（理解成了普通贪心做，一直WA），这两种做法到底有什么区别？

 1 #include <cmath>
 2 #include <cstdio>
 3 #include <cstring>
 4 #include <algorithm>
 5 #include <iostream>
 6 using namespace std;
 7 int num[1450];
 8 bool cmp(int a, int b)
 9 {
10     return a > b;
11 }
12 int main()
13 {
14     int m, t;
15     scanf("%d", &t);
16     while(t--)
17     {
18         memset(num, 0, sizeof(num));
19         scanf("%d", &m);
20         while(m--)
21         {
22             int a, b, c, d, e, maxx = 0;
23             scanf("%d %d:%d %d:%d", &a, &b, &c, &d, &e);
24             int time1 = b*60 + c;
25             int time2 = d*60 + e;
26             for(int i=time1; i<time2; i++)
27             {
28             //    for(i=time1; i<time2; i++)
29                 num[i] += a;    
30             } 
31         }
32         sort(num, num+1440, cmp);
33         printf("%d\n", num[0]);
34     }
35     return 0;
36 }