STL 案例分析

#include <iostream>
using namespace std;

#include "string"
#include <vector>
#include <list>
#include "set"
#include <algorithm>
#include "functional"
#include "iterator"  //输出流迭代器的头文件
#include<numeric>
#include "map"
#include "deque"

class Speaker
{
public:
    string    m_name;
    int        m_score[3];//3轮比赛的得分
};

//产生选手
int GenSpeaker(map<int, Speaker> &mapSpeaker, vector<int> &v)
{
    string str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    random_shuffle(str.begin(), str.end());

    for (int i=0; i<24; i++)
    {
        Speaker tmp;
        tmp.m_name = "选手";
        tmp.m_name = tmp.m_name + str[i];
        mapSpeaker.insert(pair<int, Speaker>(100+i, tmp) );
    }

    for (int i=0; i<24; i++)
    {
        v.push_back(100+i); //参加比赛的人员
    }
    return 0;
}

//选手抽签
int speech_contest_draw(vector<int> &v)
{
    random_shuffle(v.begin(), v.end());
    return 0;
}


//选手比赛
int speech_contest(int index, vector<int> &v1, map<int, Speaker> &mapSpeaker, vector<int> &v2 )
{
    //小组的比赛得分 记录下来;求出前三名 后3名
    multimap<int, int, greater<int>> multmapGroup; //小组成绩
    int tmpCount = 0;

    for (vector<int>::iterator it=v1.begin(); it!=v1.end(); it++ )
    {
        tmpCount ++;
        //打分
        {
            deque<int> dscore;
            for (int j=0; j<10; j++) //10个评委打分
            {
                int score = 50+rand()%50;
                dscore.push_back(score);
            }
            sort(dscore.begin(), dscore.end());
            dscore.pop_back();
            dscore.pop_front(); //去除最低分 最高分

            //求平均分
            int scoresum = accumulate(dscore.begin(), dscore.end(), 0);
            int scoreavg = scoresum/dscore.size();
            mapSpeaker[*it].m_score[index] = scoreavg; //选手得分 存入容器中
            multmapGroup.insert(pair<int ,int>(scoreavg, *it ) );
        }

        //处理分组
        if (tmpCount % 6 == 0)
        {
            cout << "小组的比赛成绩" << endl;
            for (multimap<int, int, greater<int>>::iterator mit=multmapGroup.begin(); mit!=multmapGroup.end(); mit++ )
            {
                //编号  姓名  得分
                cout << mit->second << "\t" << mapSpeaker[mit->second].m_name << "\t" << mit->first << endl; 
            }

            //前三名晋级
            while (multmapGroup.size() > 3)
            {
                multimap<int, int, greater<int>>::iterator it1 = multmapGroup.begin();
                v2.push_back(it1->second); //把前三名 放到v2 晋级名单 中
                multmapGroup.erase(it1);
            }

            multmapGroup.clear(); //情况本小组 比赛成绩
        }
    
    }
    return 0;
};

//查看比赛结果
int speech_contest_print(int index, vector<int> &v, map<int, Speaker> &mapSpeaker)
{
    printf("第%d轮 晋级名单\n", index+1);
    for (vector<int>::iterator it=v.begin(); it!=v.end(); it++)
    {
        cout << "参赛编号: " << *it << "\t" << mapSpeaker[*it].m_name << "\t" << mapSpeaker[*it].m_score[index] << endl;
    }
    return 0;
};

void main()
{
    //容器的设计 
    map<int, Speaker>    mapSpeaker; //参加比赛的选手
    vector<int>            v1; //第1轮 演讲比赛 名单
    vector<int>            v2; //第2轮 演讲比赛 名单
    vector<int>            v3; //第3轮 演讲比赛 名单
    vector<int>            v4; //最后前三名 演讲比赛 名单

    //产生选手 得到第一轮选手的比赛名单
    GenSpeaker(mapSpeaker, v1);

    //第1轮 选手抽签 选手比赛 查看比赛结果
    cout << "\n\n\n任意键,开始第1轮比赛" << endl;
    cin.get();
    speech_contest_draw(v1);
    speech_contest(0, v1, mapSpeaker, v2);
    speech_contest_print(0, v2, mapSpeaker);

    //第2轮 选手抽签 选手比赛 查看比赛结果
    cout << "\n\n\n任意键,开始第2轮比赛" << endl;
    cin.get();
    speech_contest_draw(v2);
    speech_contest(1, v2, mapSpeaker, v3);
    speech_contest_print(1, v3, mapSpeaker);

    //第3轮 选手抽签 选手比赛 查看比赛结果
    cout << "\n\n\n任意键,开始第3轮比赛" << endl;
    cin.get();
    speech_contest_draw(v3);
    speech_contest(2, v3, mapSpeaker, v4);
    speech_contest_print(2, v4, mapSpeaker);

    cout<<"hello..."<<endl;
    system("pause");
    return ;
}