Peter Paul and Mary

#include <iostream>
#include<fstream>
using namespace std;
ifstream infile;

int main()
{
    int a[10],b[10],c[10];
    int noOfCase;
    infile.open("1.txt");
    void set(int [],int [],int []);
    void standard(int [],int [],int []);
    int meet(int,int,int,int);
    void schedule(int [],int [],int []);

    infile>>noOfCase;
    int i = noOfCase;
    while(noOfCase!=0)
    {
        set(a,b,c);
        standard(a,b,c);
        cout<<"Case "<<i-noOfCase+1<<": ";
        schedule(a,b,c);
        noOfCase--;
    }
    infile.close();
    return 0;
}
void set(int a[],int b[],int c[])
{
    for(int i=0;i<10;i++)
    {
        infile>>a[i];
    }
    for(int i=0;i<10;i++)
    {
        infile>>b[i];
    }
    for(int i=0;i<10;i++)
    {
        infile>>c[i];
    }
    /*for(int i=0;i<10;i++)
    {
        cout<<a[i]<<" ";
    }
    cout<<endl;
    for(int i=0;i<10;i++)
    {
        cout<<b[i]<<" ";
    }
    cout<<endl;
    for(int i=0;i<10;i++)
    {
        cout<<c[i]<<" ";
    }
    cout<<endl;*/
}
void standard(int a[],int b[],int c[])
{
    for(int i=0;i<10;i++)
    {
        if(a[i]<6)
        {
            a[i]+=12;
        }
        if(b[i]<6)
        {
            b[i]+=12;
        }
        if(c[i]<6)
        {
            c[i]+=12;
        }
    }
    /*for(int i=0;i<10;i++)
    {
        cout<<a[i]<<" ";
    }
    cout<<endl;
    for(int i=0;i<10;i++)
    {
        cout<<b[i]<<" ";
    }
    cout<<endl;
    for(int i=0;i<10;i++)
    {
        cout<<c[i]<<" ";
    }*/
    //cout<<endl;
}
int meet(int a,int b,int c,int d)　　　　//在编写这个函数时最好配合画图，把每一种情况用途裂化出来，不要漏掉任何一种情况
{
    if(b<=c || d<=a)//a,b is seperate from c,d
    {
        return 0;
    }
    else if(c>=a && d<=b)//c,d are withwin a,b
    {
        return (d-c);
    }
    else if(c>=a && c<=b && d>=b)//overlap and c,d follow a,b
    {
        return (b-c);
    }
    else if(c<=a && d>=a && d<=b)//overlap and a,b follow c,d
    {
        return (d-a);
    }
    else//a>=c b<=d, that is, a,b are within c,d
    {
        return (b-a);
    }
}
void schedule(int a[], int b[], int c[])
{
    int hour[3] = {1,2,3};
    int plan[3] = {-1};
    int i = 0;
    int j;
    for (int n=0; n<3; n++)
    {
        j = 0;
        for (; i<9; i=(i+2)%10, j++)//i=0,2,4,6,8
        {
            /*cout << "hour[n]" << hour[n] << endl;
            cout << meet(a[i], a[i+1], b[i], b[i+1]) << endl;
            cout << meet(b[i], b[i+1], c[i], c[i+1]) << endl;
            cout << meet(a[i], a[i+1], c[i], c[i+1]) << endl;*/
            if (meet(a[i], a[i+1], b[i], b[i+1])>=hour[n]&&
                meet(b[i], b[i+1], c[i], c[i+1])>=hour[n]&&
                meet(a[i], a[i+1], c[i], c[i+1])>=hour[n])
                {
                    plan[n] = i/2;
                    //n++;          //这里不用让n自增，因为跳出内层for循环后会执行外层循环中的n++
                    i=(i+2)%10;
                    break;
                }
            if (j == 4)
            {
                if (plan[n] == -1)//plan[n]=-1,没有安排时间，则说明不可安排
                {
                    cout << "The meetings cannot be scheduled." << endl;
                    return;
                }
            }
        }
    }
    switch (plan[0]+1)
    {
        case 1:cout<<"Monday";break;
        case 2:cout<<"Tuesday";break;
        case 3:cout<<"Wednesday";break;
        case 4:cout<<"Thursday";break;
        case 5:cout<<"Friday";
    }
    cout<<" for 1 hour,";
    cout<<" then ";
    switch (plan[1]+1)
    {
        case 1:cout<<"Monday";break;
        case 2:cout<<"Tuesday";break;
        case 3:cout<<"Wednesday";break;
        case 4:cout<<"Thursday";break;
        case 5:cout<<"Friday";
    }
    cout<<" for 2 hours,";
    cout<<" then ";
    switch (plan[2]+1)
    {
        case 1:cout<<"Monday";break;
        case 2:cout<<"Tuesday";break;
        case 3:cout<<"Wednesday";break;
        case 4:cout<<"Thursday";break;
        case 5:cout<<"Friday";
    }
    cout<<" for 3 hours."<<endl;
}