Queues and Priority Queues are data structures which are known to most computer scientists. The Team Queue, however, is not so well known, though it occurs often in everyday life. At lunch time the queue in front of the Mensa is a team queue, for example.
In a team queue each element belongs to a team. If an element enters the queue, it first searches the queue from head to tail to check if some of its teammates (elements of the same team) are already in the queue. If yes, it enters the queue right behind them. If not, it enters the queue at the tail and becomes the new last element (bad luck). Dequeuing is done like in normal queues: elements are processed from head to tail in the order they appear in the team queue.
Your task is to write a program that simulates such a team queue.
InputThe input will contain one or more test cases. Each test case begins with the number of teams t (1<=t<=1000). Then t team descriptions follow, each one consisting of the number of elements belonging to the team and the elements themselves. Elements are integers in the range 0 - 999999. A team may consist of up to 1000 elements. In a team queue each element belongs to a team. If an element enters the queue, it first searches the queue from head to tail to check if some of its teammates (elements of the same team) are already in the queue. If yes, it enters the queue right behind them. If not, it enters the queue at the tail and becomes the new last element (bad luck). Dequeuing is done like in normal queues: elements are processed from head to tail in the order they appear in the team queue.
Your task is to write a program that simulates such a team queue.
Finally, a list of commands follows. There are three different kinds of commands:
ENQUEUE x - enter element x into the team queue
DEQUEUE - process the first element and remove it from the queue
STOP - end of test case
The input will be terminated by a value of 0 for t.
OutputFor each test case, first print a line saying "Scenario #k", where k is the number of the test case. Then, for each DEQUEUE command, print the element which is dequeued on a single line. Print a blank line after each test case, even after the last one.
Sample Input
2 3 101 102 103 3 201 202 203 ENQUEUE 101 ENQUEUE 201 ENQUEUE 102 ENQUEUE 202 ENQUEUE 103 ENQUEUE 203 DEQUEUE DEQUEUE DEQUEUE DEQUEUE DEQUEUE DEQUEUE STOP 2 5 259001 259002 259003 259004 259005 6 260001 260002 260003 260004 260005 260006 ENQUEUE 259001 ENQUEUE 260001 ENQUEUE 259002 ENQUEUE 259003 ENQUEUE 259004 ENQUEUE 259005 DEQUEUE DEQUEUE ENQUEUE 260002 ENQUEUE 260003 DEQUEUE DEQUEUE DEQUEUE DEQUEUE STOP 0Sample Output
Scenario #1 101 102 103 201 202 203 Scenario #2 259001 259002 259003 259004 259005 260001
1 #include<iostream> 2 #include<map> 3 #include<queue> 4 #include<string> 5 using namespace std; 6 int main() 7 { 8 int n; 9 int k = 0; 10 while (cin >> n, n != 0) 11 { 12 k++; 13 cout << "Scenario #" << k << endl; 14 int visit[1100] = { 0 }; 15 map<int, int>team; 16 queue<int> que; 17 queue<int> q[1100]; 18 for (int i = 0; i < n; i++) 19 { 20 int t,temp; 21 cin >> t; 22 while (t--) 23 { 24 cin >> temp; 25 team[temp] = i; 26 } 27 } 28 string sr; 29 while (cin >> sr, sr != "STOP") 30 { 31 if (sr == "ENQUEUE") 32 { 33 int tp; 34 cin >> tp; 35 q[team[tp]].push(tp); 36 if (visit[team[tp]] == 0) 37 { 38 visit[team[tp]] = 1; 39 que.push(team[tp]); 40 } 41 } 42 else 43 { 44 cout << q[que.front()].front() << endl; 45 q[que.front()].pop(); 46 if (q[que.front()].empty()) visit[que.front()] = 0,que.pop(); 47 } 48 } 49 cout << endl; 50 } 51 return 0; 52 }
//对于这题，刚开始的思路有问题，总是想着怎么用优先队列解决问题，把思路放在了怎样去定义结构体和怎样定义比较函数，想了半天完全不行，所以在网上看了一下大佬的代码，核心思路就是队列里面放队列，这方法真是简单粗暴，再使用一个数组标记那个队列已放入，厉害，，，，，，