zoukankan      html  css  js  c++  java
  • UVA-540 Team Queue

    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.
    Input
    The input file 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.
    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.
    Warning: A test case may contain up to 200000 (two hundred thousand) commands, so the implementation
    of the team queue should be efficient: both enqueing and dequeuing of an element should
    only take constant time.
    Output
    For 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.

    代码:

    #include<iostream>
    #include<cstring>
    #include<cstdio>
    #include<queue>
    #include<map>
    using namespace std;
    const int N = 1000 + 5;
    void solve_question(int n){
        map<int,int> group;
        int m,x;
        for(int i=0;i<n;i++){
            scanf("%d",&m);
            for(int j=0;j<m;j++) {scanf("%d",&x); group[x] = i;}
        }
        queue<int> q,q2[N];
        char ch[10];
        while(true){
            scanf("%s",ch);
            if(ch[0] == 'S') break;
            if(ch[0] == 'E'){
                scanf("%d",&x);
                int t = group[x];
                if(q2[t].empty()) q.push(t);
                q2[t].push(x);
            }else{
                int t = q.front();
                printf("%d ",q2[t].front());q2[t].pop();
                if(q2[t].empty()) q.pop();
            }
        }
    }
    int main(){
        int n,Case=0;
        while(scanf("%d",&n)==1 && n){
            printf("Scenario #%d ",++Case);
            solve_question(n);
            printf(" ");
        }
        return 0;
    }


  • 相关阅读:
    JAVA多线程(七) ReentrantLock原理分析
    JAVA多线程(六) synchronize原理分析
    JAVA多线程(五) volatile原理分析
    pandas
    从美国总经理,到三一重卡的董事长,梁林河的重卡梦
    【转载】低水平领导的十大表现
    kill及其衍生程序
    python -m venv 的使用
    Python多版本启动器
    Pyinstaller最流行的打包程序
  • 原文地址:https://www.cnblogs.com/Pretty9/p/7347674.html
Copyright © 2011-2022 走看看