火车购票

#include <iostream>
using namespace std;
int main()
{
    //flag[]表示每排空位的个数  
    int n,a[101],seat[21][6],flag[21];
    cin >> n;
        for(int i = 1;i <= n;i++)
    {
        cin >> a[i];    
    } 
    for(int i = 1;i <= 20;i++)
    {
        flag[i] = 5;
    }
    for(int i = 1;i <= 20;i++)
    {
        for(int j = 1;j <= 5;j++)
        {
            seat[i][j] = (i-1)*5+j;
        }
    }
    for(int i = 1;i <= n;i++)
    {
        for(int j = 1;j <= 20;j++)
        {
            if(a[i] <= flag[j])
            {
                while(a[i]--)
                {
                    if(a[i] == 0)
                    {
                        cout << seat[j][6-flag[j]] << ‘\n‘;
                        flag[j]--;
                    }
                    else
                    {
                        cout << seat[j][6-flag[j]] << ‘ ‘;
                        flag[j]--;                        
                    }
                }
                break;
            }
        }
    }
    for(int i = 1;i <= n;i++)
    {
        if(a[i] > 0)
        {
            for(int j = 1;j <= 20;j++)
            {
                while(flag[j] > 0 && a[i] > 0)
                {
                    if(a[i] == 1)
                    {
                        cout << seat[j][6-flag[j]] << "\n";
                        flag[j]--;
                        a[i]--;
                    }
                    else
                    {
                        cout << seat[j][6-flag[j]] << " ";
                        flag[j]--;
                        a[i]--;
                    }
                }
                if(a[i] == 0)
                {
                    break;
                }
            }
        }
    }
    return 0;
}