PAT甲级练习1014. Waiting in Line (30)

1014. Waiting in Line (30)

时间限制

400 ms

内存限制

65536 kB

代码长度限制

16000 B

判题程序

Standard

作者

CHEN, Yue

Suppose a bank has N windows open for service. There is a yellow line in front of the windows which devides the waiting area into two parts. The rules for the customers to wait in line are:

• The space inside the yellow line in front of each window is enough to contain a line with M customers. Hence when all the N lines are full, all the customers after (and including) the (NM+1)st one will have to wait in a line behind the yellow line.
• Each customer will choose the shortest line to wait in when crossing the yellow line. If there are two or more lines with the same length, the customer will always choose the window with the smallest number.
• Customer[i] will take T[i] minutes to have his/her transaction processed.
• The first N customers are assumed to be served at 8:00am.

Now given the processing time of each customer, you are supposed to tell the exact time at which a customer has his/her business done.

For example, suppose that a bank has 2 windows and each window may have 2 custmers waiting inside the yellow line. There are 5 customers waiting with transactions taking 1, 2, 6, 4 and 3 minutes, respectively. At 08:00 in the morning, customer₁ is served at window₁ while customer₂ is served at window₂. Customer₃ will wait in front of window₁ and customer₄ will wait in front of window₂. Customer₅ will wait behind the yellow line.

At 08:01, customer₁ is done and customer₅ enters the line in front of window₁ since that line seems shorter now. Customer₂ will leave at 08:02, customer₄ at 08:06, customer₃ at 08:07, and finally customer₅ at 08:10.

Input

Each input file contains one test case. Each case starts with a line containing 4 positive integers: N (<=20, number of windows), M (<=10, the maximum capacity of each line inside the yellow line), K (<=1000, number of customers), and Q (<=1000, number of customer queries).

The next line contains K positive integers, which are the processing time of the K customers.

The last line contains Q positive integers, which represent the customers who are asking about the time they can have their transactions done. The customers are numbered from 1 to K.

Output

For each of the Q customers, print in one line the time at which his/her transaction is finished, in the format HH:MM where HH is in [08, 17] and MM is in [00, 59]. Note that since the bank is closed everyday after 17:00, for those customers who cannot be served before 17:00, you must output "Sorry" instead.

Sample Input

2 2 7 51 2 6 4 3 534 23 4 5 6 7

Sample Output

08:0708:0608:1017:00Sorry

一个排队问题。

主要思路：对于n*m的人来说直接按顺序排上去就好。之后的人要根据各个窗口先出现空先排。对每个窗口使用一个queue来保存排队时间，startTime记录新来的人被开始服务的时间，popTime记录队首的人离开的时间。借此进行判断。

注意：只要17点前被开始服务，即使17点之后结束的也应该正常输出时间的

#include <cstdio>#include <algorithm>#include <queue>#include <vector>using namespace std;int n, m, k, q;struct CustomerQueue{int startTime;int popTime;queue<int> serviceTime;};int main(){int index=1;scanf("%d%d%d%d", &n, &m, &k, &q);vector<CustomerQueue> windows(n+1);int* serviceTime = new int[k+1];int* finishTime = new int[k+1];vector<bool> sorry(k+1,false);//添加一个存储超时信息的数组，光靠时间判断会出现问题int* query = new int[q+1];for(int i=1; i<=n; i++){//初始化一下，否则在VS下int会初始化为0xccccccccwindows[i].popTime = 0;windows[i].startTime = 0;}for(int i=1; i<=k; i++){scanf("%d", &serviceTime[i]);}for(int i=1; i<=m; i++){for(int j=1;j<=n; j++){if(index<=k){windows[j].serviceTime.push(serviceTime[index]);if(windows[j].startTime>=540)sorry[index]=true;windows[j].startTime += serviceTime[index];finishTime[index] = windows[j].startTime;if(i==1)windows[j].popTime = windows[j].startTime;index++;    }}}while(index<=k){int tmpTime=windows[1].popTime, tmpIndex=1;for(int i=2; i<=n; i++){if(windows[i].popTime<tmpTime){tmpTime = windows[i].popTime;tmpIndex = i;}}windows[tmpIndex].serviceTime.pop();windows[tmpIndex].serviceTime.push(serviceTime[index]);windows[tmpIndex].popTime += windows[tmpIndex].serviceTime.front();if(windows[tmpIndex].startTime>=540)sorry[index]=true;windows[tmpIndex].startTime += serviceTime[index];finishTime[index] = windows[tmpIndex].startTime;index++;}for(int i=1; i<=q; i++){scanf("%d", &query[i]);}for(int i=1; i<=q; i++){if(sorry[query[i]]==false){printf("%02d:%02d\n", (finishTime[query[i]]+480)/60, (finishTime[query[i]]+480)%60);}else{printf("Sorry\n");}}return 0;}

PS. 特别注意一下初始化的问题，如int全局变量会初始化为0，但是在struct中的局部变量就不会，要注意！